3613e7c4e5
ngtsc has a robust suite of testing utilities, designed for in-memory testing of a TypeScript compiler. Previously these utilities lived in the `test` directory for the compiler-cli package. This commit moves those utilities to an `ngtsc/testing` package, enabling them to be depended on separately and opening the door for using them from the upcoming language server testing infrastructure. As part of this refactoring, the `fake_core` package (a lightweight API replacement for @angular/core) is expanded to include functionality needed for Language Service test use cases. PR Close #39594
67 lines
2.8 KiB
TypeScript
67 lines
2.8 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as ts from 'typescript';
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import {absoluteFrom} from '../../../src/ngtsc/file_system';
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import {runInEachFileSystem, TestFile} from '../../../src/ngtsc/file_system/testing';
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import {Reference} from '../../../src/ngtsc/imports';
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import {PartialEvaluator} from '../../../src/ngtsc/partial_evaluator';
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import {DeclarationNode, TypeScriptReflectionHost} from '../../../src/ngtsc/reflection';
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import {getDeclaration, loadTestFiles} from '../../../src/ngtsc/testing';
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import {NgccReferencesRegistry} from '../../src/analysis/ngcc_references_registry';
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import {makeTestBundleProgram} from '../helpers/utils';
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runInEachFileSystem(() => {
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describe('NgccReferencesRegistry', () => {
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it('should return a mapping from resolved reference identifiers to their declarations', () => {
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const _ = absoluteFrom;
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const TEST_FILES: TestFile[] = [{
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name: _('/index.ts'),
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contents: `
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export class SomeClass {}
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export function someFunction() {}
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export const someVariable = 42;
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export const testArray = [SomeClass, someFunction, someVariable];
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`
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}];
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loadTestFiles(TEST_FILES);
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const {program} = makeTestBundleProgram(TEST_FILES[0].name);
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const checker = program.getTypeChecker();
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const indexPath = _('/index.ts');
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const testArrayDeclaration =
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getDeclaration(program, indexPath, 'testArray', ts.isVariableDeclaration);
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const someClassDecl = getDeclaration(program, indexPath, 'SomeClass', ts.isClassDeclaration);
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const someFunctionDecl =
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getDeclaration(program, indexPath, 'someFunction', ts.isFunctionDeclaration);
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const someVariableDecl =
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getDeclaration(program, indexPath, 'someVariable', ts.isVariableDeclaration);
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const testArrayExpression = testArrayDeclaration.initializer!;
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const reflectionHost = new TypeScriptReflectionHost(checker);
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const evaluator = new PartialEvaluator(reflectionHost, checker, /* dependencyTracker */ null);
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const registry = new NgccReferencesRegistry(reflectionHost);
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const references = (evaluator.evaluate(testArrayExpression) as any[]).filter(isReference);
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registry.add(null!, ...references);
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const map = registry.getDeclarationMap();
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expect(map.size).toEqual(2);
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expect(map.get(someClassDecl.name!)!.node).toBe(someClassDecl);
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expect(map.get(someFunctionDecl.name!)!.node).toBe(someFunctionDecl);
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expect(map.has(someVariableDecl.name as ts.Identifier)).toBe(false);
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});
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});
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function isReference(ref: any): ref is Reference<DeclarationNode> {
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return ref instanceof Reference;
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}
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});
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