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typescript_host_spec.ts
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typescript_host_spec.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import 'reflect-metadata';
import * as ts from 'typescript';
import {TypeScriptServiceHost} from '../src/typescript_host';
import {toh} from './test_data';
import {MockTypescriptHost} from './test_utils';
describe('TypeScriptServiceHost', () => {
it('should be able to create a typescript host', () => {
const tsLSHost = new MockTypescriptHost(['/app/main.ts'], toh);
const tsLS = ts.createLanguageService(tsLSHost);
expect(() => new TypeScriptServiceHost(tsLSHost, tsLS)).not.toThrow();
});
it('should be able to analyze modules', () => {
const tsLSHost = new MockTypescriptHost(['/app/main.ts'], toh);
const tsLS = ts.createLanguageService(tsLSHost);
const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
expect(ngLSHost.getAnalyzedModules()).toBeDefined();
});
it('should be able to analyze modules without a tsconfig.json file', () => {
const tsLSHost = new MockTypescriptHost(['foo.ts'], toh);
const tsLS = ts.createLanguageService(tsLSHost);
const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
expect(ngLSHost.getAnalyzedModules()).toBeDefined();
});
it('should not throw if there is no script names', () => {
const tsLSHost = new MockTypescriptHost([], toh);
const tsLS = ts.createLanguageService(tsLSHost);
const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
expect(() => ngLSHost.getAnalyzedModules()).not.toThrow();
});
it('should clear the caches if program changes', () => {
// First create a TypescriptHost with empty script names
const tsLSHost = new MockTypescriptHost([], toh);
const tsLS = ts.createLanguageService(tsLSHost);
const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
expect(ngLSHost.getAnalyzedModules().ngModules).toEqual([]);
// Now add a script, this would change the program
const fileName = '/app/main.ts';
const content = (tsLSHost as MockTypescriptHost).getFileContent(fileName) !;
(tsLSHost as MockTypescriptHost).addScript(fileName, content);
// If the caches are not cleared, we would get back an empty array.
// But if the caches are cleared then the analyzed modules will be non-empty.
expect(ngLSHost.getAnalyzedModules().ngModules.length).not.toEqual(0);
});
it('should throw if getSourceFile is called on non-TS file', () => {
const tsLSHost = new MockTypescriptHost([], toh);
const tsLS = ts.createLanguageService(tsLSHost);
const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
expect(() => {
ngLSHost.getSourceFile('/src/test.ng');
}).toThrowError('Non-TS source file requested: /src/test.ng');
});
});