angular-docs-cn/modules/@angular/facade/test/exception_handler_spec.ts

import {
  beforeEach,
  ddescribe,
  describe,
  expect,
  iit,
  inject,
  it,
  xdescribe,
  xit,
} from '@angular/core/testing/testing_internal';
import {BaseException, WrappedException, ExceptionHandler} from '../src/exceptions';

class _CustomException {
  context = "some context";
  toString(): string { return "custom"; }
}

export function main() {
  describe('ExceptionHandler', () => {
    it("should output exception", () => {
      var e = ExceptionHandler.exceptionToString(new BaseException("message!"));
      expect(e).toContain("message!");
    });

    it("should output stackTrace", () => {
      var e = ExceptionHandler.exceptionToString(new BaseException("message!"), "stack!");
      expect(e).toContain("stack!");
    });

    it("should join a long stackTrace", () => {
      var e =
          ExceptionHandler.exceptionToString(new BaseException("message!"), ["stack1", "stack2"]);
      expect(e).toContain("stack1");
      expect(e).toContain("stack2");
    });

    it("should output reason when present", () => {
      var e = ExceptionHandler.exceptionToString(new BaseException("message!"), null, "reason!");
      expect(e).toContain("reason!");
    });

    describe("context", () => {
      it("should print context", () => {
        var e = ExceptionHandler.exceptionToString(
            new WrappedException("message!", null, null, "context!"));
        expect(e).toContain("context!");
      });

      it("should print nested context", () => {
        var original = new WrappedException("message!", null, null, "context!");
        var e = ExceptionHandler.exceptionToString(new WrappedException("message", original));
        expect(e).toContain("context!");
      });

      it("should not print context when the passed-in exception is not a BaseException", () => {
        var e = ExceptionHandler.exceptionToString(new _CustomException());
        expect(e).not.toContain("context");
      });
    });

    describe('original exception', () => {
      it("should print original exception message if available (original is BaseException)", () => {
        var realOriginal = new BaseException("inner");
        var original = new WrappedException("wrapped", realOriginal);
        var e =
            ExceptionHandler.exceptionToString(new WrappedException("wrappedwrapped", original));
        expect(e).toContain("inner");
      });

      it("should print original exception message if available (original is not BaseException)",
         () => {
           var realOriginal = new _CustomException();
           var original = new WrappedException("wrapped", realOriginal);
           var e =
               ExceptionHandler.exceptionToString(new WrappedException("wrappedwrapped", original));
           expect(e).toContain("custom");
         });
    });

    describe('original stack', () => {
      it("should print original stack if available", () => {
        var realOriginal = new BaseException("inner");
        var original = new WrappedException("wrapped", realOriginal, "originalStack");
        var e = ExceptionHandler.exceptionToString(
            new WrappedException("wrappedwrapped", original, "wrappedStack"));
        expect(e).toContain("originalStack");
      });
    });
  });
}