Don't use 'interface' in test files.

editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/ExpressionTest.dart

Index: editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/ExpressionTest.dart
diff --git a/editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/ExpressionTest.dart b/editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/ExpressionTest.dart
deleted file mode 100644
index 7a3703791124403f7c80dc66f5c68b8d4ec6b377..0000000000000000000000000000000000000000
--- a/editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/ExpressionTest.dart
+++ /dev/null
@@ -1,112 +0,0 @@
-// 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.
-
-// Tests basic expressions. Does not attempt to validate the details of arithmetic, coercion, and
-// so forth.
-class ExpressionTest {
-
-  ExpressionTest() {}
-
-  int foo;
-
-  static main() {
-    var test = new ExpressionTest();
-    test.testBinary();
-    test.testUnary();
-    test.testShifts();
-    test.testBitwise();
-    test.testIncrement();
-    test.testMangling();
-  }
-
-  testBinary() {
-    int x = 4, y = 2;
-    assert(x + y == 6);
-    assert(x - y == 2);
-    assert(x * y == 8);
-    assert(x / y == 2);
-    assert(x % y == 0);
-  }
-
-  testUnary() {
-    int x = 4, y = 2;
-    bool t = true, f = false;
-    assert(-x == -4);
-    assert(~x == -5);
-    assert(!t == f);
-  }
-
-  testShifts() {
-    int x = 4, y = 2;
-    assert(x >> 1 == y);
-    assert(y << 1 == x);
-  }
-
-  testBitwise() {
-    int x = 4, y = 2;
-    assert((x | y) == 6);
-    assert((x & y) == 0);
-    assert((x ^ y) == 6);
-  }
-
-  operator [](int index) {
-    return foo;
-  }
-
-  operator []=(int index, int value) {
-    foo = value;
-  }
-
-  testIncrement() {
-    int x = 4, a = x++;
-    assert(a == 4);
-    assert(x == 5);
-    assert(++x == 6);
-    assert(x++ == 6);
-    assert(x == 7);
-    assert(--x == 6);
-    assert(x-- == 6);
-    assert(x == 5);
-
-    this.foo = 0;
-    assert(this.foo++ == 0);
-    assert(this.foo == 1);
-    assert(++this.foo == 2);
-    assert(this.foo == 2);
-    assert(this.foo-- == 2);
-    assert(this.foo == 1);
-    assert(--this.foo == 0);
-    assert(this.foo == 0);
-
-    assert(this[0]++ == 0);
-    assert(this[0] == 1);
-    assert(++this[0] == 2);
-    assert(this[0] == 2);
-    assert(this[0]-- == 2);
-    assert(this[0] == 1);
-    assert(--this[0] == 0);
-    assert(this[0] == 0);
-
-    int $0 = 42, $1 = 87, $2 = 117;
-    assert($0++ == 42);
-    assert($0 == 43);
-    assert(++$0 == 44);
-    assert(($0 += $0) == 88);
-    assert($1++ == 87);
-    assert($1 == 88);
-    assert(++$1 == 89);
-    assert(($1 += $1) == 178);
-    assert($2++ == 117);
-    assert($2 == 118);
-    assert(++$2 == 119);
-  }
-
-  void testMangling() {
-    int $0 = 42, $1 = 87, $2 = 117;
-    this[0] = 0;
-    assert((this[0] += $0) == 42);
-    assert((this[0] += $1) == 129);
-    assert((this[0] += $2) == 246);
-  }
-}