Add negation to single-identifier tests in status files.

tests/standalone/status_expression_test.dart

Index: tests/standalone/status_expression_test.dart
diff --git a/tests/standalone/status_expression_test.dart b/tests/standalone/status_expression_test.dart
index a16c746d8d596c6b19063910600a296b60e53b0d..0cea061319091d05572d567d33876ffa6f33d4f0 100644
--- a/tests/standalone/status_expression_test.dart
+++ b/tests/standalone/status_expression_test.dart
@@ -22,6 +22,7 @@ main() {
   testExpression();
   testSyntaxError();
   testBoolean();
+  testNotBoolean();
   testNotEqual();
 }
 
@@ -76,6 +77,32 @@ void testBoolean() {
   Expect.isFalse(expression.evaluate(environment));
 }
 
+void testNotBoolean() {
+  var expression =
+      Expression.parse(r"  $arch == ia32 && ! $unchecked || $mode == release ");
+  Expect.equals(
+      r"((($arch == ia32) && (bool ! $unchecked)) || ($mode == release))",
+      expression.toString());
+
+  var environment = <String, dynamic>{

[Bob Nystrom, 2017/06/01 23:07:46]

This map needs to be wrapped in new TestEnvironment() now that my change landed
yesterday. (Also, the type arguments aren't needed.)

[Lasse Reichstein Nielsen, 2017/06/07 08:51:48]

Done.

+    "arch": "ia32",
+    "unchecked": false,

[Bob Nystrom, 2017/06/01 23:07:45]

Nit: Would you mind using "checked" for this?

It seems a little confusing to use the negated term in the test when the whole
point of "!" is so we don't need negated terms.

[Lasse Reichstein Nielsen, 2017/06/07 08:51:48]

Sure. This was just the "minimal diff" from the test above :)

+    "mode": "debug"
+  };
+
+  Expect.isTrue(expression.evaluate(environment));
+  environment["mode"] = "release";
+  Expect.isTrue(expression.evaluate(environment));
+  environment["unchecked"] = true;

[Bob Nystrom, 2017/06/01 23:07:45]

"true" and "false" need to be explicitly stringified now. The environment
uniformly treats all values as strings.

[Lasse Reichstein Nielsen, 2017/06/07 08:51:48]

Done.

+  Expect.isTrue(expression.evaluate(environment));
+  environment["mode"] = "debug";
+  Expect.isFalse(expression.evaluate(environment));
+  environment["arch"] = "arm";
+  Expect.isFalse(expression.evaluate(environment));
+  environment["unchecked"] = false;
+  Expect.isFalse(expression.evaluate(environment));
+}
+
 void testNotEqual() {
   // Test the != operator.
   var expression = Expression.parse(r"$compiler == dart2js && $runtime != ie9");