cpsir unittests: move all unittests into individual files and test runners.

tests/compiler/dart2js/js_backend_cps_ir.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Test that the CPS IR code generator compiles programs and produces the
-// the expected output.
-
-import 'package:async_helper/async_helper.dart';
-import 'package:expect/expect.dart';
-import 'package:compiler/src/apiimpl.dart' show
-    CompilerImpl;
-import 'memory_compiler.dart';
-import 'package:compiler/src/js/js.dart' as js;
-import 'package:compiler/src/elements/elements.dart' show
-    ClassElement,
-    Element;
-
-const String TEST_MAIN_FILE = 'test.dart';
-
-class TestEntry {
-  final String source;
-  final String expectation;
-  final String elementName;
-
-  const TestEntry(this.source, [this.expectation])
-    : elementName = null;
-
-  const TestEntry.forMethod(this.elementName,
-      this.source, this.expectation);
-}
-
-String formatTest(Map test) {
-  return test[TEST_MAIN_FILE];
-}
-
-String getCodeForMain(CompilerImpl compiler) {
-  Element mainFunction = compiler.mainFunction;
-  js.Node ast = compiler.enqueuer.codegen.generatedCode[mainFunction];
-  return js.prettyPrint(ast, compiler).getText();
-}
-
-String getCodeForMethod(CompilerImpl compiler,
-                        String name) {
-  Element foundElement;
-  for (Element element in compiler.enqueuer.codegen.generatedCode.keys) {
-    if (element.toString() == name) {
-      if (foundElement != null) {
-        Expect.fail('Multiple compiled elements are called $name');
-      }
-      foundElement = element;
-    }
-  }
-
-  if (foundElement == null) {
-    Expect.fail('There is no compiled element called $name');
-  }
-
-  js.Node ast = compiler.enqueuer.codegen.generatedCode[foundElement];
-  return js.prettyPrint(ast, compiler).getText();
-}
-
-runTests(List<TestEntry> tests) {
-  for (TestEntry test in tests) {
-    Map files = {TEST_MAIN_FILE: test.source};
-    asyncTest(() async {
-      Uri uri = Uri.parse('memory:$TEST_MAIN_FILE');
-      String expected = test.expectation;
-      String found = null;
-      try {
-        CompilationResult result = await runCompiler(
-            entryPoint: uri,
-            memorySourceFiles: files,
-            options: <String>['--use-cps-ir']);
-        Expect.isTrue(result.isSuccess);
-        CompilerImpl compiler = result.compiler;
-        if (expected != null) {
-          found = test.elementName == null
-              ? getCodeForMain(compiler)
-              : getCodeForMethod(compiler, test.elementName);
-        }
-      } catch (e, st) {
-        print(e);
-        print(st);
-        Expect.fail('The following test failed to compile:\n'
-                    '${formatTest(files)}');
-      }
-      if (expected != found) {
-        Expect.fail('Unexpected output for test:\n  '
-            '${formatTest(files).replaceAll('\n', '\n  ')}\n'
-            'Expected:\n  ${expected.replaceAll('\n', '\n  ')}\n'
-            'but found:\n  ${found?.replaceAll('\n', '\n  ')}');
-      }
-    });
-  }
-}