test(compiler): add integration like tests to compiler unit tests (#14157)

Closes PR #14157

PR Close #14157

modules/@angular/compiler/test/aot/compiler_spec.ts

@@ -0,0 +1,191 @@
+/**
+ * @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 {AotCompiler, AotCompilerHost, createAotCompiler} from '@angular/compiler';
+import {async} from '@angular/core/testing';
+import * as path from 'path';
+import * as ts from 'typescript';
+
+import {ReflectionCapabilities, reflector} from './private_import_core';
+import {EmittingCompilerHost, MockAotCompilerHost, MockCompilerHost, MockData, settings} from './test_util';
+
+const DTS = /\.d\.ts$/;
+
+// These are the files that contain the well known annotations.
+const CORE_FILES = [
+  '@angular/core/src/metadata.ts', '@angular/core/src/di/metadata.ts',
+  '@angular/core/src/di/injection_token.ts', '@angular/core/src/animation/metadata.ts',
+  '@angular/core/src/di/provider.ts', '@angular/core/src/linker/view.ts'
+];
+
+describe('compiler', () => {
+  let angularFiles: Map<string, string>;
+
+  beforeAll(() => {
+    const emittingHost = new EmittingCompilerHost(CORE_FILES);
+    const emittingProgram = ts.createProgram(emittingHost.scripts, settings, emittingHost);
+    emittingProgram.emit();
+    angularFiles = emittingHost.written;
+  });
+
+  describe('Quickstart', () => {
+    let host: MockCompilerHost;
+    let aotHost: MockAotCompilerHost;
+
+    beforeEach(() => {
+      host = new MockCompilerHost(QUICKSTART, FILES, angularFiles);
+      aotHost = new MockAotCompilerHost(host);
+    });
+
+    // Restore reflector since AoT compiler will update it with a new static reflector
+    afterEach(() => { reflector.updateCapabilities(new ReflectionCapabilities()); });
+
+    it('should compile',
+       async(() => compile(host, aotHost, expectNoDiagnostics).then(generatedFiles => {
+         expect(generatedFiles.find(f => /app\.component\.ngfactory\.ts/.test(f.genFileUrl)))
+             .not.toBeUndefined();
+         expect(generatedFiles.find(f => /app\.module\.ngfactory\.ts/.test(f.genFileUrl)))
+             .not.toBeUndefined();
+       })));
+
+    it('should compile using summaries',
+       async(() => summaryCompile(host, aotHost).then(generatedFiles => {
+         expect(generatedFiles.find(f => /app\.component\.ngfactory\.ts/.test(f.genFileUrl)))
+             .not.toBeUndefined();
+         expect(generatedFiles.find(f => /app\.module\.ngfactory\.ts/.test(f.genFileUrl)))
+             .not.toBeUndefined();
+       })));
+  });
+});
+
+function expectNoDiagnostics(program: ts.Program) {
+  function fileInfo(diagnostic: ts.Diagnostic): string {
+    if (diagnostic.file) {
+      return `${diagnostic.file.fileName}(${diagnostic.start}): `;
+    }
+    return '';
+  }
+
+  function chars(len: number, ch: string): string { return new Array(len).fill(ch).join(''); }
+
+  function lineNoOf(offset: number, text: string): number {
+    let result = 1;
+    for (let i = 0; i < offset; i++) {
+      if (text[i] == '\n') result++;
+    }
+    return result;
+  }
+
+  function lineInfo(diagnostic: ts.Diagnostic): string {
+    if (diagnostic.file) {
+      const start = diagnostic.start;
+      let end = diagnostic.start + diagnostic.length;
+      const source = diagnostic.file.text;
+      let lineStart = start;
+      let lineEnd = end;
+      while (lineStart > 0 && source[lineStart] != '\n') lineStart--;
+      if (lineStart < start) lineStart++;
+      while (lineEnd < source.length && source[lineEnd] != '\n') lineEnd++;
+      let line = source.substring(lineStart, lineEnd);
+      const lineIndex = line.indexOf('/n');
+      if (lineIndex > 0) {
+        line = line.substr(0, lineIndex);
+        end = start + lineIndex;
+      }
+      const lineNo = lineNoOf(start, source) + ': ';
+      return '\n' + lineNo + line + '\n' + chars(start - lineStart + lineNo.length, ' ') +
+          chars(end - start, '^');
+    }
+    return '';
+  }
+
+  function expectNoDiagnostics(diagnostics: ts.Diagnostic[]) {
+    if (diagnostics && diagnostics.length) {
+      throw new Error(
+          'Errors from TypeScript:\n' +
+          diagnostics.map(d => `${fileInfo(d)}${d.messageText}${lineInfo(d)}`).join(' \n'));
+    }
+  }
+  expectNoDiagnostics(program.getOptionsDiagnostics());
+  expectNoDiagnostics(program.getSyntacticDiagnostics());
+  expectNoDiagnostics(program.getSemanticDiagnostics());
+}
+
+function isDTS(fileName: string): boolean {
+  return /\.d\.ts$/.test(fileName);
+}
+
+function isSource(fileName: string): boolean {
+  return /\.ts$/.test(fileName);
+}
+
+function isFactory(fileName: string): boolean {
+  return /\.ngfactory\./.test(fileName);
+}
+
+function summaryCompile(
+    host: MockCompilerHost, aotHost: MockAotCompilerHost,
+    preCompile?: (program: ts.Program) => void) {
+  // First compile the program to generate the summary files.
+  return compile(host, aotHost).then(generatedFiles => {
+    // Remove generated files that were not generated from a DTS file
+    host.remove(generatedFiles.filter(f => !isDTS(f.srcFileUrl)).map(f => f.genFileUrl));
+
+    // Next compile the program shrowding metadata and only treating .ts files as source.
+    aotHost.hideMetadata();
+    aotHost.tsFilesOnly();
+
+    return compile(host, aotHost);
+  });
+}
+
+function compile(
+    host: MockCompilerHost, aotHost: AotCompilerHost, preCompile?: (program: ts.Program) => void,
+    postCompile: (program: ts.Program) => void = expectNoDiagnostics) {
+  const program = ts.createProgram(host.scriptNames, settings, host);
+  if (preCompile) preCompile(program);
+  const {compiler, reflector} = createAotCompiler(aotHost, {});
+  return compiler.compileAll(program.getSourceFiles().map(sf => sf.fileName))
+      .then(generatedFiles => {
+        generatedFiles.forEach(
+            file => isSource(file.genFileUrl) ? host.addScript(file.genFileUrl, file.source) :
+                                                host.override(file.genFileUrl, file.source));
+        const newProgram = ts.createProgram(host.scriptNames, settings, host, program);
+        if (postCompile) postCompile(newProgram);
+        return generatedFiles;
+      });
+}
+
+const QUICKSTART = ['/quickstart/app/app.module.ts'];
+const FILES: MockData = {
+  quickstart: {
+    app: {
+      'app.component.ts': `
+        import {Component} from '@angular/core/src/metadata';
+
+        @Component({
+          template: '<h1>Hello {{name}}</h1>'
+        })
+        export class AppComponent {
+          name = 'Angular';
+        }
+      `,
+      'app.module.ts': `
+        import { NgModule }      from '@angular/core/src/metadata';
+
+        import { AppComponent }  from './app.component';
+
+        @NgModule({
+          declarations: [ AppComponent ],
+          bootstrap:    [ AppComponent ]
+        })
+        export class AppModule { }
+      `
+    }
+  }
+};