[tests] Minor spelling and grammar fixes

Change-Id: I18c309b9037cf94a883443ac9067f911f829516c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/388945
Reviewed-by: Lasse Nielsen <[email protected]>
Reviewed-by: Nate Bosch <[email protected]>
Commit-Queue: Lasse Nielsen <[email protected]>

Author: parlough

tests/corelib/date_time_far_away_dates_test.dart

@@ -50,7 +50,7 @@ void testFarAwayDates() {
   Expect.equals(true, dt.hour >= 0 && dt.hour < 24);
   // Not much we can test for the minute and second.
   //
-  // Historical timezones can have arbitrary offets. For example, "Pacific
+  // Historical timezones can have arbitrary offsets. For example, "Pacific
   // Standard Time" in the United States is represented by Los Angeles. Prior to
   // the adoption of "Railway Time" in the United States at noon on 18 November
   // 1883, the local time in Los Angeles had an offset of a few minutes from the

tests/corelib/map_test.dart

@@ -57,7 +57,7 @@ void main() {
 
   // NaN maps need to have nullable value types because the forEach method
   // cannot look up the value and therefore might find `null` instead of the
-  // actuall value. See MapMixin.forEach in dart:collection/maps.dart
+  // actual value. See MapMixin.forEach in dart:collection/maps.dart
   testNaNKeys(new Map());
   testNaNKeys(new Map<num, String?>());
   testNaNKeys(new HashMap());

tests/corelib/regexp/overflow_test.dart

@@ -27,7 +27,7 @@ import 'package:expect/expect.dart';
 
 void main() {
   description(
-      "This test checks expressions with alternative lengths of appox. 2^31.");
+      "This test checks expressions with alternative lengths of approx. 2^31.");
 
   var regexp1 = new RegExp(r"(?:(?=g))|(?:m).{2147483648,}");
   shouldBeNull(regexp1.firstMatch(''));

tests/corelib/regexp/unicode-regexp-restricted-syntax_test.dart

@@ -51,7 +51,7 @@ void main() {
   assertThrows(() => RegExp(r"[\c]", unicode: true));
   // test262/built-ins/RegExp/unicode_restricted_identity_escape_c
   assertThrows(() => RegExp(r"[\c0]", unicode: true));
-  // test262/built-ins/RegExp/unicode_restricted_incomple_quantifier
+  // test262/built-ins/RegExp/unicode_restricted_incomplete_quantifier
   assertThrows(() => RegExp(r"a{", unicode: true));
   assertThrows(() => RegExp(r"a{1,", unicode: true));
   assertThrows(() => RegExp(r"{", unicode: true));

tests/corelib/stopwatch_test.dart

@@ -44,7 +44,7 @@ class StopwatchTest {
       }
       sw2LastElapsed = sw2.elapsedTicks;
     }
-    // The test only makes sense if measureable time elapsed and elapsed time
+    // The test only makes sense if measurable time elapsed and elapsed time
     // on the stopped Stopwatch did not increase.
     Expect.isTrue(sw2.elapsedTicks > 0);
     return true;

tests/language/await/await_with_no_context_test.dart

@@ -2,7 +2,7 @@
 // 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.
 
-// Verify that if an `await` expression appears in a syntactic postion that
+// Verify that if an `await` expression appears in a syntactic position that
 // doesn't impose a context on it, it supplies a context of `FutureOr<_>` to its
 // operand, rather than `_` (which was the behavior prior to fixing
 // https://github.com/dart-lang/language/issues/3648).

tests/language/bool/has_environment_not_new_test.dart

@@ -8,7 +8,7 @@ const bool isVM = const bool.fromEnvironment('dart.isVM');
 
 main() {
   // On non-VM targets `new bool.hasEnvironment(...)` just throws, because it
-  // is only guaranted to work with `const`. However on VM it actually works.
+  // is only guaranteed to work with `const`. However on VM it actually works.
   if (!isVM) {
     Expect.throws(() => new bool.hasEnvironment("Anything"));
   } else {

tests/language/class_modifiers/trans_legacy/legacy_lib.dart

@@ -8,7 +8,7 @@ import "dart:collection";
 
 // Pre-feature declarations which ignore platform library restrictions.
 // Used to test that feature-enabled libraries behave correctly when
-// going througn pre-feature super-declarations.
+// going through pre-feature super-declarations.
 
 // Ignoring rule against extending, implementing, mixing in and `on`-typing
 // a final declaration.

tests/language/deferred/exported_main_test.dart

@@ -9,6 +9,6 @@ foo() {
   // The frontend will not recognize that this is the root library. Though this
   // library is not reachable from what the frontend considers the root library,
   // the entry point pragma will still cause this function to compiled by
-  // gen_snaption, so it is important that this library is assigned to a
+  // gen_snapshot, so it is important that this library is assigned to a
   // loading unit.
 }

tests/language/enum/enhanced_enums_basic_test.dart

@@ -236,7 +236,7 @@ enum EnumAll<S extends num, T extends num>
   // constructors and the implicit element creation expressions.)
   // Cannot have const factory constructor, because they *must* redirect to
   // generative constructors.
-  // Cannot have `super`-constuctor invocations in initializer lists.
+  // Cannot have `super`-constructor invocations in initializer lists.
 
   // Instance members.