refactor(rtts_assert): Ts'ify rtts_assert
Translate rtts_assert to TypeScript.
This commit is contained in:
Ian Riley
parent
d53c898499
commit
9e8108ee14
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@ -1 +0,0 @@
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export * from './src/rtts_assert';
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@ -0,0 +1 @@
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export * from './src/rtts_assert';
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@ -16,9 +16,9 @@ function argPositionName(i) {
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var primitives;
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var genericType;
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if (typeof $traceurRuntime === 'object') {
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primitives = $traceurRuntime.type;
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genericType = $traceurRuntime.genericType;
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if (typeof _global['$traceurRuntime'] === 'object') {
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primitives = _global['$traceurRuntime'].type;
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genericType = _global['$traceurRuntime'].genericType;
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} else {
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// Allow to work without traceur runtime as well!
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primitives = {
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@ -26,21 +26,15 @@ if (typeof $traceurRuntime === 'object') {
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boolean: {name: 'boolean'},
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number: {name: 'number'},
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string: {name: 'string'},
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symbol: {name: 'symbol'},
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void: {name: 'void'}
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symbol: {name: 'symbol'}, void: {name: 'void'}
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};
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genericType = function(type, args) {
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return {
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type: type,
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args: args
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}
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return { type: type, args: args }
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}
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}
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Object.keys(primitives).forEach(function(name) {
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primitives[name].__assertName = name;
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});
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Object.keys(primitives).forEach(function(name) { primitives[name].__assertName = name; });
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export function proxy(){
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export function proxy() {
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}
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function assertArgumentTypes(...params) {
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@ -59,10 +53,10 @@ function assertArgumentTypes(...params) {
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//
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if (!isType(actual, type, currentArgErrors)) {
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// console.log(JSON.stringify(errors, null, ' '));
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// TODO(vojta): print "an instance of" only if T starts with uppercase.
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errors.push(argPositionName(i) + ' argument has to be an instance of ' + prettyPrint(type) + ', got ' + prettyPrint(actual));
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errors.push(argPositionName(i) + ' argument has to be an instance of ' + prettyPrint(type) +
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', got ' + prettyPrint(actual));
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if (currentArgErrors.length) {
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errors.push(currentArgErrors);
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}
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@ -74,7 +68,7 @@ function assertArgumentTypes(...params) {
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}
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}
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function prettyPrint(value, depth) {
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function prettyPrint(value, depth?) {
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if (typeof(depth) === 'undefined') {
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depth = 0;
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}
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@ -159,7 +153,7 @@ function isType(value, T, errors) {
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var isValid;
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currentStack = errors;
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try {
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isValid = T.assert(value) ;
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isValid = T.assert(value);
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} catch (e) {
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fail(e.message);
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isValid = false;
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@ -201,30 +195,33 @@ function _isProxy(obj) {
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function formatErrors(errors, indent = ' ') {
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return errors.map((e) => {
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if (typeof e === 'string') return indent + '- ' + e;
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return formatErrors(e, indent + ' ');
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}).join('\n');
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if (typeof e === 'string') return indent + '- ' + e;
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return formatErrors(e, indent + ' ');
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})
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.join('\n');
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}
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// assert a type of given value and throw if does not pass
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function type(actual, T) {
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var errors = [];
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// currentStack = [];
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var type: any =
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function(actual, T) {
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var errors = [];
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// currentStack = [];
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if (!isType(actual, T, errors)) {
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// console.log(JSON.stringify(errors, null, ' '));
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// TODO(vojta): print "an instance of" only if T starts with uppercase.
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var msg = 'Expected an instance of ' + prettyPrint(T) + ', got ' + prettyPrint(actual) + '!';
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if (errors.length) {
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msg += '\n' + formatErrors(errors);
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if (!isType(actual, T, errors)) {
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// console.log(JSON.stringify(errors, null, ' '));
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// TODO(vojta): print "an instance of" only if T starts with uppercase.
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var msg =
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'Expected an instance of ' + prettyPrint(T) + ', got ' + prettyPrint(actual) + '!';
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if (errors.length) {
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msg += '\n' + formatErrors(errors);
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}
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throw new Error(msg);
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}
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return actual;
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}
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throw new Error(msg);
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}
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return actual;
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}
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function returnType(actual, T) {
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var errors = [];
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// currentStack = [];
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@ -232,7 +229,8 @@ function returnType(actual, T) {
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if (!isType(actual, T, errors)) {
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// console.log(JSON.stringify(errors, null, ' '));
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// TODO(vojta): print "an instance of" only if T starts with uppercase.
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var msg = 'Expected to return an instance of ' + prettyPrint(T) + ', got ' + prettyPrint(actual) + '!';
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var msg = 'Expected to return an instance of ' + prettyPrint(T) + ', got ' +
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prettyPrint(actual) + '!';
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if (errors.length) {
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msg += '\n' + formatErrors(errors);
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}
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@ -244,17 +242,12 @@ function returnType(actual, T) {
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}
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// TODO(vojta): define these with DSL?
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var string = type.string = define('string', function(value) {
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return typeof value === 'string';
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});
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var string = type.string = define('string', function(value) { return typeof value === 'string'; });
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var boolean = type.boolean = define('boolean', function(value) {
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return typeof value === 'boolean';
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});
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var boolean = type.boolean =
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define('boolean', function(value) { return typeof value === 'boolean'; });
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var number = type.number = define('number', function(value) {
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return typeof value === 'number';
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});
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var number = type.number = define('number', function(value) { return typeof value === 'number'; });
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function arrayOf(...types) {
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return assert.define('array of ' + types.map(prettyPrint).join('/'), function(value) {
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@ -311,46 +304,46 @@ function define(classOrName, check) {
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return cls;
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}
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var assert: any =
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function(value) {
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return {
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is: function is(...types) {
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// var errors = []
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var allErrors = [];
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var errors;
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for (var i = 0; i < types.length; i++) {
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var type = types[i];
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errors = [];
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if (isType(value, type, errors)) {
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return true;
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}
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function assert(value) {
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return {
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is: function is(...types) {
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// var errors = []
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var allErrors = [];
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var errors;
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for (var i = 0; i < types.length; i++) {
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var type = types[i];
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errors = [];
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// if no errors, merge multiple "is not instance of " into x/y/z ?
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allErrors.push(prettyPrint(value) + ' is not instance of ' + prettyPrint(type));
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if (errors.length) {
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allErrors.push(errors);
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}
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}
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if (isType(value, type, errors)) {
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return true;
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// if (types.length > 1) {
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// currentStack.push(['has to be ' + types.map(prettyPrint).join(' or '),
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// ...allErrors]);
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// } else {
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currentStack.push(...allErrors);
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// }
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return false;
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}
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// if no errors, merge multiple "is not instance of " into x/y/z ?
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allErrors.push(prettyPrint(value) + ' is not instance of ' + prettyPrint(type))
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if (errors.length) {
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allErrors.push(errors);
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}
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}
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// if (types.length > 1) {
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// currentStack.push(['has to be ' + types.map(prettyPrint).join(' or '), ...allErrors]);
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// } else {
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currentStack.push(...allErrors);
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// }
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return false;
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};
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}
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};
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}
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// PUBLIC API
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// PUBLIC API
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// asserting API
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// asserting API
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// throw if no type provided
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assert.type = type;
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// throw if no type provided
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assert.type = type;
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for (var prop in primitives) {
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assert.type[prop] = primitives[prop];
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}
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@ -1,413 +0,0 @@
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// # Assert.js
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// A run-time type assertion library for JavaScript. Designed to be used with [Traceur](https://github.com/google/traceur-compiler).
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// - [Basic Type Check](#basic-type-check)
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// - [Custom Check](#custom-check)
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// - [Primitive Values](#primitive-values)
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// - [Describing more complex types](#describing-more-complex-types)
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// - [assert.arrayOf](#assert-arrayof)
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// - [assert.structure](#assert-structure)
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// - [Integrating with Traceur](#integrating-with-traceur)
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// Note: `assert` gets automatically included by traceur!
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export function main() {
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return;
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describe('prettyPrint', () => {
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class Type {};
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it('should limit the number of printed properties', () => {
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var o = {};
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for (var i = 0; i < 100; i++) {
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o['p_' + i] = i;
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}
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try {
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assert.type(o, Type);
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throw 'fail!';
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} catch (e) {
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expect(e.message.indexOf('p_0')).toBeGreaterThan(-1);
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expect(e.message.indexOf('...')).toBeGreaterThan(-1);
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expect(e.message.indexOf('p_20')).toBe(-1);
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}
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});
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it('should limit the depth of printed properties', () => {
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var o = {l1: {l2: {l3: {l4: {l5: {l6: 'deep'}}}}}};
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expect(() => {
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assert.type(o, Type);
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}).toThrowError('Expected an instance of Type, got {l1: {l2: {l3: {l4: [...]}}}}!');
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});
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});
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// ## Basic Type Check
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// By default, `instanceof` is used to check the type.
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//
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// Note that you can use `assert.type()` in unit tests or anywhere in your code.
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// Most of the time, you will use it with Traceur.
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// Jump to the [Traceur section](#integrating-with-traceur) to see an example of that.
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describe('basic type check', function() {
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class Type {}
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it('should pass', function() {
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assert.type(new Type(), Type);
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});
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it('should fail', function() {
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expect(() => assert.type(123, Type))
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.toThrowError('Expected an instance of Type, got 123!');
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});
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it('should allow null', function() {
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assert.type(null, Type);
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});
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});
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// ## Custom Check
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// Often, `instanceof` is not flexible enough.
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// In that case, your type can define its own `assert` method which will be used instead.
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//
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// See [Describing More Complex Types](#describing-more-complex-types) for examples how to
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// define custom checks using `assert.define()`.
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describe('custom check', function() {
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class Type {}
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// the basic check can just return true/false, without specifying any reason
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it('should pass when returns true', function() {
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Type.assert = function(value) {
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return true;
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};
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assert.type({}, Type);
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});
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it('should fail when returns false', function() {
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Type.assert = function(value) {
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return false;
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};
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expect(() => assert.type({}, Type))
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.toThrowError('Expected an instance of Type, got {}!');
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});
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// Using `assert.fail()` allows to report even multiple errors.
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it('should fail when calls assert.fail()', function() {
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Type.assert = function(value) {
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assert.fail('not smart enough');
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assert.fail('not blue enough');
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};
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expect(() => assert.type({}, Type))
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.toThrowError('Expected an instance of Type, got {}!\n' +
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' - not smart enough\n' +
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' - not blue enough');
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});
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it('should fail when throws an exception', function() {
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Type.assert = function(value) {
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throw new Error('not long enough');
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};
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expect(function() {
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assert.type(12345, Type);
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}).toThrowError('Expected an instance of Type, got 12345!\n' +
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' - not long enough');
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});
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});
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// ## Primitive Values
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// You don't want to check primitive values (such as strings, numbers, or booleans) using `typeof` rather than
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// `instanceof`.
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//
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// Again, you probably won't write this code and rather use Traceur to do it for you, simply based on type annotations.
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describe('primitive value check', function() {
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var primitive = $traceurRuntime.type;
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describe('string', function() {
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it('should pass', function() {
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assert.type('xxx', primitive.string);
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});
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it('should fail', function() {
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expect(() => assert.type(12345, primitive.string))
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.toThrowError('Expected an instance of string, got 12345!');
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});
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it('should allow null', function() {
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assert.type(null, primitive.string);
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});
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});
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describe('number', function() {
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it('should pass', function() {
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assert.type(123, primitive.number);
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});
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it('should fail', function() {
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expect(() => assert.type(false, primitive.number))
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.toThrowError('Expected an instance of number, got false!');
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});
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it('should allow null', function() {
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assert.type(null, primitive.number);
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});
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});
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describe('boolean', function() {
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it('should pass', function() {
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expect(assert.type(true, primitive.boolean)).toBe(true);
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expect(assert.type(false, primitive.boolean)).toBe(false);
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});
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it('should fail', function() {
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expect(() => assert.type(123, primitive.boolean))
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.toThrowError('Expected an instance of boolean, got 123!');
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});
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it('should allow null', function() {
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assert.type(null, primitive.boolean);
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});
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});
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});
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// ## Describing more complex types
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//
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// Often, a simple type check using `instanceof` or `typeof` is not enough.
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// That's why you can define custom checks using this DSL.
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// The goal was to make them easy to compose and as descriptive as possible.
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// Of course you can write your own DSL on the top of this.
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describe('define', function() {
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// If the first argument to `assert.define()` is a type (function), it will define `assert` method on that function.
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//
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// In this example, being a type of Type means being a either a function or object.
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it('should define assert for an existing type', function() {
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class Type {}
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assert.define(Type, function(value) {
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assert(value).is(Function, Object);
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});
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assert.type({}, Type);
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assert.type(function() {}, Type);
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expect(() => assert.type('str', Type))
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.toThrowError('Expected an instance of Type, got "str"!\n' +
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' - "str" is not instance of Function\n' +
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' - "str" is not instance of Object');
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});
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// If the first argument to `assert.define()` is a string,
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// it will create an interface - basically an empty class with `assert` method.
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it('should define an interface', function() {
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var User = assert.define('MyUser', function(user) {
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assert(user).is(Object);
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});
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assert.type({}, User);
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expect(() => assert.type(12345, User))
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.toThrowError('Expected an instance of MyUser, got 12345!\n' +
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' - 12345 is not instance of Object');
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});
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// Here are a couple of more APIs to describe your custom types...
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//
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// ### assert.arrayOf
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// Checks if the value is an array and if so, it checks whether all the items are one the given types.
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// These types can be composed types, not just simple ones.
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describe('arrayOf', function() {
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var Titles = assert.define('ListOfTitles', function(value) {
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assert(value).is(assert.arrayOf(assert.string, assert.number));
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});
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it('should pass', function () {
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assert.type(['one', 55, 'two'], Titles);
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});
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it('should fail when non-array given', function () {
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expect(() => assert.type('foo', Titles))
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.toThrowError('Expected an instance of ListOfTitles, got "foo"!\n' +
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' - "foo" is not instance of array of string/number\n' +
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' - "foo" is not instance of Array');
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});
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it('should fail when an invalid item in the array', function () {
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expect(() => assert.type(['aaa', true], Titles))
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.toThrowError('Expected an instance of ListOfTitles, got ["aaa", true]!\n' +
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' - ["aaa", true] is not instance of array of string/number\n' +
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' - true is not instance of string\n' +
|
||||
' - true is not instance of number');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
// ### assert.structure
|
||||
// Similar to `assert.arrayOf` which checks a content of an array,
|
||||
// `assert.structure` checks if the value is an object with specific properties.
|
||||
describe('structure', function() {
|
||||
|
||||
var User = assert.define('MyUser', function(value) {
|
||||
assert(value).is(assert.structure({
|
||||
name: assert.string,
|
||||
age: assert.number
|
||||
}));
|
||||
});
|
||||
|
||||
it('should pass', function () {
|
||||
assert.type({name: 'Vojta', age: 28}, User);
|
||||
});
|
||||
|
||||
|
||||
it('should fail when non-object given', function () {
|
||||
expect(() => assert.type(123, User))
|
||||
.toThrowError('Expected an instance of MyUser, got 123!\n' +
|
||||
' - 123 is not instance of object with properties name, age\n' +
|
||||
' - 123 is not instance of Object');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when an invalid property', function () {
|
||||
expect(() => assert.type({name: 'Vojta', age: true}, User))
|
||||
.toThrowError('Expected an instance of MyUser, got {name: "Vojta", age: true}!\n' +
|
||||
' - {name: "Vojta", age: true} is not instance of object with properties name, age\n' +
|
||||
' - true is not instance of number');
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
// ## Integrating with Traceur
|
||||
//
|
||||
// Manually calling `assert.type()` in your code is cumbersome. Most of the time, you'll want to
|
||||
// have Traceur add the calls to `assert.type()` to your code based on type annotations.
|
||||
//
|
||||
// This has several advantages:
|
||||
// - it's shorter and nicer,
|
||||
// - you can easily ignore it when generating production code.
|
||||
//
|
||||
// You'll need to run Traceur with `--types=true --type-assertions=true --type-assertion-module="path/to/assert"`.
|
||||
describe('Traceur', function() {
|
||||
|
||||
describe('arguments', function() {
|
||||
|
||||
function reverse(str: string) {
|
||||
return str ? reverse(str.substring(1)) + str[0] : ''
|
||||
}
|
||||
|
||||
it('should pass', function() {
|
||||
expect(reverse('angular')).toBe('ralugna');
|
||||
});
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => reverse(123))
|
||||
.toThrowError('Invalid arguments given!\n' +
|
||||
' - 1st argument has to be an instance of string, got 123');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('return value', function() {
|
||||
|
||||
function foo(bar): number {
|
||||
return bar;
|
||||
}
|
||||
|
||||
it('should pass', function() {
|
||||
expect(foo(123)).toBe(123);
|
||||
});
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => foo('bar'))
|
||||
.toThrowError('Expected to return an instance of number, got "bar"!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('variables', function() {
|
||||
|
||||
it('should pass', function() {
|
||||
var count:number = 1;
|
||||
});
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => {
|
||||
var count: number = true;
|
||||
}).toThrowError('Expected an instance of number, got true!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('void', function() {
|
||||
function foo(bar): void {
|
||||
return bar;
|
||||
}
|
||||
|
||||
it('should pass when not defined', function() {
|
||||
function nonReturn(): void {}
|
||||
function returnNothing(): void { return; }
|
||||
function returnUndefined(): void { return undefined; }
|
||||
|
||||
foo();
|
||||
foo(undefined);
|
||||
nonReturn();
|
||||
returnNothing();
|
||||
returnUndefined();
|
||||
});
|
||||
|
||||
|
||||
it('should fail when a value returned', function() {
|
||||
expect(() => foo('bar'))
|
||||
.toThrowError('Expected to return an instance of void, got "bar"!');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when null returned', function() {
|
||||
expect(() => foo(null))
|
||||
.toThrowError('Expected to return an instance of void, got null!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('generics', function() {
|
||||
|
||||
it('should pass', function() {
|
||||
var list:Array<string> = [];
|
||||
});
|
||||
|
||||
// TODO(tbosch): add assertions based on generics to rtts_assert
|
||||
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,368 @@
|
|||
// # Assert.js
|
||||
// A run-time type assertion library for JavaScript. Designed to be used with
|
||||
// [Traceur](https://github.com/google/traceur-compiler).
|
||||
import {} from '../../angular2/src/test_lib/e2e_util';
|
||||
import {assert} from '../rtts_assert';
|
||||
|
||||
// - [Basic Type Check](#basic-type-check)
|
||||
// - [Custom Check](#custom-check)
|
||||
// - [Primitive Values](#primitive-values)
|
||||
// - [Describing more complex types](#describing-more-complex-types)
|
||||
// - [assert.arrayOf](#assert-arrayof)
|
||||
// - [assert.structure](#assert-structure)
|
||||
// - [Integrating with Traceur](#integrating-with-traceur)
|
||||
|
||||
// Note: `assert` gets automatically included by traceur!
|
||||
|
||||
export function main() {
|
||||
return;
|
||||
|
||||
describe('prettyPrint', () => {
|
||||
function Type() {}
|
||||
|
||||
it('should limit the number of printed properties', () => {
|
||||
var o = {};
|
||||
for (var i = 0; i < 100; i++) {
|
||||
o['p_' + i] = i;
|
||||
}
|
||||
try {
|
||||
assert.type(o, Type);
|
||||
throw 'fail!';
|
||||
} catch (e) {
|
||||
expect(e.message.indexOf('p_0')).toBeGreaterThan(-1);
|
||||
expect(e.message.indexOf('...')).toBeGreaterThan(-1);
|
||||
expect(e.message.indexOf('p_20')).toEqual(-1);
|
||||
}
|
||||
});
|
||||
|
||||
it('should limit the depth of printed properties', () => {
|
||||
var o = {l1: {l2: {l3: {l4: {l5: {l6: 'deep'}}}}}};
|
||||
|
||||
expect(() => { assert.type(o, Type); })
|
||||
.toThrowError('Expected an instance of Type, got {l1: {l2: {l3: {l4: [...]}}}}!');
|
||||
});
|
||||
});
|
||||
|
||||
// ## Basic Type Check
|
||||
// By default, `instanceof` is used to check the type.
|
||||
//
|
||||
// Note that you can use `assert.type()` in unit tests or anywhere in your code.
|
||||
// Most of the time, you will use it with Traceur.
|
||||
// Jump to the [Traceur section](#integrating-with-traceur) to see an example of that.
|
||||
describe('basic type check', function() {
|
||||
|
||||
function Type() {}
|
||||
|
||||
it('should pass', function() { assert.type(new Type(), Type); });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => assert.type(123, Type)).toThrowError('Expected an instance of Type, got 123!');
|
||||
});
|
||||
|
||||
|
||||
it('should allow null', function() { assert.type(null, Type); });
|
||||
});
|
||||
|
||||
|
||||
|
||||
// ## Custom Check
|
||||
// Often, `instanceof` is not flexible enough.
|
||||
// In that case, your type can define its own `assert` method which will be used instead.
|
||||
//
|
||||
// See [Describing More Complex Types](#describing-more-complex-types) for examples how to
|
||||
// define custom checks using `assert.define()`.
|
||||
describe('custom check', function() {
|
||||
|
||||
function Type() {}
|
||||
|
||||
// the basic check can just return true/false, without specifying any reason
|
||||
it('should pass when returns true', function() {
|
||||
(<any>Type).assert = function(value) { return true; };
|
||||
|
||||
assert.type({}, Type);
|
||||
});
|
||||
|
||||
|
||||
it('should fail when returns false', function() {
|
||||
(<any>Type).assert = function(value) { return false; };
|
||||
|
||||
expect(() => assert.type({}, Type)).toThrowError('Expected an instance of Type, got {}!');
|
||||
});
|
||||
|
||||
|
||||
// Using `assert.fail()` allows to report even multiple errors.
|
||||
it('should fail when calls assert.fail()', function() {
|
||||
(<any>Type).assert = function(value) {
|
||||
assert.fail('not smart enough');
|
||||
assert.fail('not blue enough');
|
||||
};
|
||||
|
||||
expect(() => assert.type({}, Type))
|
||||
.toThrowError('Expected an instance of Type, got {}!\n' +
|
||||
' - not smart enough\n' +
|
||||
' - not blue enough');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when throws an exception', function() {
|
||||
(<any>Type).assert = function(value) { throw new Error('not long enough'); };
|
||||
|
||||
expect(function() { assert.type(12345, Type); })
|
||||
.toThrowError('Expected an instance of Type, got 12345!\n' +
|
||||
' - not long enough');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
// ## Primitive Values
|
||||
// You don't want to check primitive values (such as strings, numbers, or booleans) using `typeof`
|
||||
// rather than
|
||||
// `instanceof`.
|
||||
//
|
||||
// Again, you probably won't write this code and rather use Traceur to do it for you, simply based
|
||||
// on type annotations.
|
||||
describe('primitive value check', function() {
|
||||
var primitive = global['$traceurRuntime'].type;
|
||||
|
||||
describe('string', function() {
|
||||
|
||||
it('should pass', function() { assert.type('xxx', primitive.string); });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => assert.type(12345, primitive.string))
|
||||
.toThrowError('Expected an instance of string, got 12345!');
|
||||
});
|
||||
|
||||
it('should allow null', function() { assert.type(null, primitive.string); });
|
||||
});
|
||||
|
||||
|
||||
describe('number', function() {
|
||||
|
||||
it('should pass', function() { assert.type(123, primitive.number); });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => assert.type(false, primitive.number))
|
||||
.toThrowError('Expected an instance of number, got false!');
|
||||
});
|
||||
|
||||
it('should allow null', function() { assert.type(null, primitive.number); });
|
||||
});
|
||||
|
||||
|
||||
describe('boolean', function() {
|
||||
|
||||
it('should pass', function() {
|
||||
expect(assert.type(true, primitive.boolean)).toEqual(true);
|
||||
expect(assert.type(false, primitive.boolean)).toEqual(false);
|
||||
});
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => assert.type(123, primitive.boolean))
|
||||
.toThrowError('Expected an instance of boolean, got 123!');
|
||||
});
|
||||
|
||||
it('should allow null', function() { assert.type(null, primitive.boolean); });
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
// ## Describing more complex types
|
||||
//
|
||||
// Often, a simple type check using `instanceof` or `typeof` is not enough.
|
||||
// That's why you can define custom checks using this DSL.
|
||||
// The goal was to make them easy to compose and as descriptive as possible.
|
||||
// Of course you can write your own DSL on the top of this.
|
||||
describe('define', function() {
|
||||
|
||||
// If the first argument to `assert.define()` is a type (function), it will define `assert`
|
||||
// method on that function.
|
||||
//
|
||||
// In this example, being a type of Type means being a either a function or object.
|
||||
it('should define assert for an existing type', function() {
|
||||
function Type() {}
|
||||
|
||||
assert.define(Type, function(value) { assert(value).is(Function, Object); });
|
||||
|
||||
assert.type({}, Type);
|
||||
assert.type(function() {}, Type);
|
||||
expect(() => assert.type('str', Type))
|
||||
.toThrowError('Expected an instance of Type, got "str"!\n' +
|
||||
' - "str" is not instance of Function\n' +
|
||||
' - "str" is not instance of Object');
|
||||
});
|
||||
|
||||
|
||||
// If the first argument to `assert.define()` is a string,
|
||||
// it will create an interface - basically an empty class with `assert` method.
|
||||
it('should define an interface', function() {
|
||||
var User = assert.define('MyUser', function(user) { assert(user).is(Object); });
|
||||
|
||||
assert.type({}, User);
|
||||
expect(() => assert.type(12345, User))
|
||||
.toThrowError('Expected an instance of MyUser, got 12345!\n' +
|
||||
' - 12345 is not instance of Object');
|
||||
});
|
||||
|
||||
|
||||
// Here are a couple of more APIs to describe your custom types...
|
||||
//
|
||||
// ### assert.arrayOf
|
||||
// Checks if the value is an array and if so, it checks whether all the items are one the given
|
||||
// types.
|
||||
// These types can be composed types, not just simple ones.
|
||||
describe('arrayOf', function() {
|
||||
|
||||
var Titles = assert.define('ListOfTitles', function(value) {
|
||||
assert(value).is(assert.arrayOf(assert.string, assert.number));
|
||||
});
|
||||
|
||||
it('should pass', function() { assert.type(['one', 55, 'two'], Titles); });
|
||||
|
||||
|
||||
it('should fail when non-array given', function() {
|
||||
expect(() => assert.type('foo', Titles))
|
||||
.toThrowError('Expected an instance of ListOfTitles, got "foo"!\n' +
|
||||
' - "foo" is not instance of array of string/number\n' +
|
||||
' - "foo" is not instance of Array');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when an invalid item in the array', function() {
|
||||
expect(() => assert.type(['aaa', true], Titles))
|
||||
.toThrowError('Expected an instance of ListOfTitles, got ["aaa", true]!\n' +
|
||||
' - ["aaa", true] is not instance of array of string/number\n' +
|
||||
' - true is not instance of string\n' +
|
||||
' - true is not instance of number');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
// ### assert.structure
|
||||
// Similar to `assert.arrayOf` which checks a content of an array,
|
||||
// `assert.structure` checks if the value is an object with specific properties.
|
||||
describe('structure', function() {
|
||||
|
||||
var User = assert.define('MyUser', function(value) {
|
||||
assert(value).is(assert.structure({name: assert.string, age: assert.number}));
|
||||
});
|
||||
|
||||
it('should pass', function() { assert.type({name: 'Vojta', age: 28}, User); });
|
||||
|
||||
|
||||
it('should fail when non-object given', function() {
|
||||
expect(() => assert.type(123, User))
|
||||
.toThrowError('Expected an instance of MyUser, got 123!\n' +
|
||||
' - 123 is not instance of object with properties name, age\n' +
|
||||
' - 123 is not instance of Object');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when an invalid property', function() {
|
||||
expect(() => assert.type({name: 'Vojta', age: true}, User))
|
||||
.toThrowError(
|
||||
'Expected an instance of MyUser, got {name: "Vojta", age: true}!\n' +
|
||||
' - {name: "Vojta", age: true} is not instance of object with properties name, age\n' +
|
||||
' - true is not instance of number');
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
// ## Integrating with Traceur
|
||||
//
|
||||
// Manually calling `assert.type()` in your code is cumbersome. Most of the time, you'll want to
|
||||
// have Traceur add the calls to `assert.type()` to your code based on type annotations.
|
||||
//
|
||||
// This has several advantages:
|
||||
// - it's shorter and nicer,
|
||||
// - you can easily ignore it when generating production code.
|
||||
//
|
||||
// You'll need to run Traceur with `--types=true --type-assertions=true
|
||||
// --type-assertion-module="path/to/assert"`.
|
||||
describe('Traceur', function() {
|
||||
|
||||
describe('arguments', function() {
|
||||
|
||||
function reverse(str: string) { return str ? reverse(str.substring(1)) + str[0] : '' }
|
||||
|
||||
it('should pass', function() { expect(reverse('angular')).toEqual('ralugna'); });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => reverse(<any>123))
|
||||
.toThrowError('Invalid arguments given!\n' +
|
||||
' - 1st argument has to be an instance of string, got 123');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('return value', function() {
|
||||
|
||||
function foo(bar): number { return bar; }
|
||||
|
||||
it('should pass', function() { expect(foo(123)).toEqual(123); });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => foo('bar'))
|
||||
.toThrowError('Expected to return an instance of number, got "bar"!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('variables', function() {
|
||||
|
||||
it('should pass', function() { var count: number = 1; });
|
||||
|
||||
|
||||
it('should fail', function() {
|
||||
expect(() => { var count: number = <any>true; })
|
||||
.toThrowError('Expected an instance of number, got true!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('void', function() {
|
||||
function foo(bar?): void { return bar; }
|
||||
|
||||
it('should pass when not defined', function() {
|
||||
function nonReturn(): void {}
|
||||
function returnNothing(): void { return; }
|
||||
function returnUndefined(): void { return undefined; }
|
||||
|
||||
foo();
|
||||
foo(undefined);
|
||||
nonReturn();
|
||||
returnNothing();
|
||||
returnUndefined();
|
||||
});
|
||||
|
||||
|
||||
it('should fail when a value returned', function() {
|
||||
expect(() => foo('bar')).toThrowError('Expected to return an instance of void, got "bar"!');
|
||||
});
|
||||
|
||||
|
||||
it('should fail when null returned', function() {
|
||||
expect(() => foo(null)).toThrowError('Expected to return an instance of void, got null!');
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
describe('generics', function() {
|
||||
|
||||
it('should pass', function() { var list: Array<string> = []; });
|
||||
|
||||
// TODO(tbosch): add assertions based on generics to rtts_assert
|
||||
|
||||
});
|
||||
|
||||
});
|
||||
}
|
||||
Loading…
Reference in New Issue