test(compiler-cli): make typescript_ast_factory_spec tests resilient to line-endings (angular#38866)

The tests were assuming that newlines were `\n` characters but this is not
the case on Windows. This was fixed in angular#38925, but a better solution is to
configure the TS printer to always use `\n` characters for newlines.

PR Close angular#38866

Author: petebacondarwin

packages/compiler-cli/src/ngtsc/translator/test/typescript_ast_factory_spec.ts

@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {leadingComment} from '@angular/compiler';
-import {EOL} from 'os';
 import * as ts from 'typescript';
 
 import {TypeScriptAstFactory} from '../src/typescript_ast_factory';
@@ -25,7 +24,7 @@ describe('TypeScriptAstFactory', () => {
         '/* comment 1 */',
         '//comment 2',
         'x = 10;',
-      ].join(EOL));
+      ].join('\n'));
     });
   });
 
@@ -62,7 +61,7 @@ describe('TypeScriptAstFactory', () => {
         '    x = 10;',
         '    y = 20;',
         '}',
-      ].join(EOL));
+      ].join('\n'));
     });
   });
 
@@ -153,7 +152,7 @@ describe('TypeScriptAstFactory', () => {
         '    x = 10;',
         'else',
         '    x = 42;',
-      ].join(EOL));
+      ].join('\n'));
     });
 
     it('should create an if statement if the else expression is null', () => {
@@ -163,7 +162,7 @@ describe('TypeScriptAstFactory', () => {
       expect(generate(ifStmt)).toEqual([
         'if (!test)',
         '    x = 10;',
-      ].join(EOL));
+      ].join('\n'));
     });
   });
 
@@ -363,7 +362,7 @@ describe('TypeScriptAstFactory', () => {
  * work via the returned `generate()` function.
  */
 function setupStatements(stmts: string = ''): SetupResult<ts.Statement> {
-  const printer = ts.createPrinter();
+  const printer = ts.createPrinter({newLine: ts.NewLineKind.LineFeed});
   const sf = ts.createSourceFile('test.ts', stmts, ts.ScriptTarget.ES2015, true);
   return {
     items: Array.from(sf.statements),