Implement binary "!=" operator in status file parser.

tests/standalone/status_expression_test.dart

 // Copyright (c) 2011, 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.
 
 library StatusExpressionTest;
 
 import "package:expect/expect.dart";
 import "../../tools/testing/dart/status_expression.dart";
 
 
 class StatusExpressionTest {
   static void testMain() {
     test1();
     test2();
     test3();
     test4();
     test5();
     test6();
+    test7();
   }
 
   static void test1() {
     Tokenizer tokenizer = new Tokenizer(
         r" $mode == debug && ($arch == chromium || $arch == dartc) ");
     tokenizer.tokenize();
     Expect.listEquals(tokenizer.tokens,
         ["\$", "mode", "==", "debug", "&&", "(", "\$", "arch", "==",
          "chromium", "||", "\$", "arch", "==", "dartc", ")"]);
     ExpressionParser parser =
@@ skipping 109 matching lines @@
     Expect.isTrue(ast.evaluate(environment));
     environment["checked"] = false;
     Expect.isTrue(ast.evaluate(environment));
     environment["mode"] = "debug";
     Expect.isFalse(ast.evaluate(environment));
     environment["arch"] = "arm";
     Expect.isFalse(ast.evaluate(environment));
     environment["checked"] = true;
     Expect.isFalse(ast.evaluate(environment));
   }
+
+  static void test7() {
+    // Test the != operator.
+    Tokenizer tokenizer =
+        new Tokenizer(r"$compiler == dart2js && $runtime != ie9");
+    tokenizer.tokenize();
+    ExpressionParser parser =
+        new ExpressionParser(new Scanner(tokenizer.tokens));
+    BooleanExpression ast = parser.parseBooleanExpression();
+    Expect.equals(r"(($compiler == dart2js) && ($runtime != ie9))",
+                  ast.toString());
+
+    // Test BooleanExpression.evaluate().
+    Map environment = new Map();
+
+    environment["compiler"] = "none";
+    environment["runtime"] = "ie9";
+    Expect.isFalse(ast.evaluate(environment));
+    environment["runtime"] = "chrome";
+    Expect.isFalse(ast.evaluate(environment));
+
+    environment["compiler"] = "dart2js";
+    environment["runtime"] = "ie9";
+    Expect.isFalse(ast.evaluate(environment));
+    environment["runtime"] = "chrome";
+    Expect.isTrue(ast.evaluate(environment));
+  }
 }
 
 main() {
   StatusExpressionTest.testMain();
 }