Format all tests.

tests/language/assign_op_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.
 // Dart test program for testing assign operators.
 // VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 import "package:expect/expect.dart";
 
-
 class AssignOpTest {
   AssignOpTest() {}
 
   static testMain() {
     var b = 0;
     b += 1;
     Expect.equals(1, b);
     b *= 5;
     Expect.equals(5, b);
     b -= 1;
@@ skipping 38 matching lines @@
     o.instf /= 4;
     Expect.equals(.5, o.instf);
 
     var x = 0xFF;
     x >>= 3;
     Expect.equals(0x1F, x);
     x <<= 3;
     Expect.equals(0xF8, x);
     x |= 0xF00;
     Expect.equals(0xFF8, x);
-    x &=0xF0;
+    x &= 0xF0;
     Expect.equals(0xF0, x);
-    x ^=0x11;
+    x ^= 0x11;
     Expect.equals(0xE1, x);
 
     var y = 100;
     y += 1 << 3;
     Expect.equals(108, y);
     y *= 2 + 1;
     Expect.equals(324, y);
     y -= 3 - 2;
     Expect.equals(323, y);
     y += 3 * 4;
     Expect.equals(335, y);
 
     var a = [1, 2, 3];
     var ix = 0;
     a[ix] |= 12;
     Expect.equals(13, a[ix]);
   }
 
   static var f;
   var instf;
 }
+
 main() {
   for (int i = 0; i < 20; i++) {
     AssignOpTest.testMain();
   }
 }