Spit pub tests into smaller suites.

utils/tests/pub/install/git/require_pubspec_test.dart

+// Copyright (c) 2012, 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('pub_tests');
+
+#import('dart:io');
+
+#import('../../test_pub.dart');
+#import('../../../../../pkg/unittest/unittest.dart');
+
+main() {
+  test('requires the dependency to have a pubspec', () {
+    ensureGit();
+
+    git('foo.git', [
+      libDir('foo')
+    ]).scheduleCreate();
+
+    appDir([{"git": "../foo.git"}]).scheduleCreate();
+
+    // TODO(nweiz): clean up this RegExp when either issue 4706 or 4707 is
+    // fixed.
+    schedulePub(args: ['install'],
+        error: const RegExp('^Package "foo" doesn\'t have a '
+            'pubspec.yaml file.'),
+        exitCode: 1);
+
+    run();
+  });
+}