Add a "pub dependencies" command.

sdk/lib/_internal/pub/test/deps_test.dart

Index: sdk/lib/_internal/pub/test/deps_test.dart
diff --git a/sdk/lib/_internal/pub/test/deps_test.dart b/sdk/lib/_internal/pub/test/deps_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..30153624d5d8c62cb0d0157cdc492faba6f0d829
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/deps_test.dart
@@ -0,0 +1,141 @@
+// Copyright (c) 2013, 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.
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import 'descriptor.dart' as d;
+import 'test_pub.dart';
+
+main() {
+  initConfig();
+
+  setUp(() {
+    servePackages([
+      packageMap("normal", "1.2.3", {
+        "transitive": "any",
+        "circular_a": "any"
+      }),
+      packageMap("transitive", "1.2.3", {
+        "shared": "any"
+      }),
+      packageMap("shared", "1.2.3", {
+        "other": "any"
+      }),
+      packageMap("unittest", "1.2.3", {
+        "shared": "any"
+      }),
+      packageMap("other", "1.0.0"),
+      packageMap("overridden", "1.0.0"),
+      packageMap("overridden", "2.0.0"),
+      packageMap("override_only", "1.2.3"),
+      packageMap("circular_a", "1.2.3", {
+        "circular_b": "any"
+      }),
+      packageMap("circular_b", "1.2.3", {
+        "circular_a": "any"
+      })
+    ]);
+
+    d.dir("from_path", [
+      d.libDir("from_path"),
+      d.libPubspec("from_path", "1.2.3")
+    ]).create();
+
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {
+          "normal": "any",
+          "overridden": "1.0.0",
+          "from_path": {"path": "../from_path"}
+        },
+        "dev_dependencies": {
+          "unittest": "any"
+        },
+        "dependency_overrides": {
+          "overridden": "2.0.0",
+          "override_only": "any"
+        }
+      })
+    ]).create();
+  });
+
+  integration("lists dependencies in compact form", () {
+    pubGet();
+    schedulePub(args: ['deps', '-s', 'compact'], output: '''
+        myapp 0.0.0
+
+        dependencies:
+        - from_path 1.2.3
+        - normal 1.2.3 [circular_a transitive]
+        - overridden 2.0.0
+
+        dev dependencies:
+        - unittest 1.2.3 [shared]
+
+        dependency overrides:
+        - overridden 2.0.0
+        - override_only 1.2.3
+
+        transitive dependencies:
+        - circular_a 1.2.3 [circular_b]
+        - circular_b 1.2.3 [circular_a]
+        - other 1.0.0
+        - shared 1.2.3 [other]
+        - transitive 1.2.3 [shared]
+        ''');
+  });
+
+  integration("lists dependencies in list form", () {
+    pubGet();
+    schedulePub(args: ['deps', '--style', 'list'], output: '''
+        myapp 0.0.0
+
+        dependencies:
+        - from_path 1.2.3
+        - overridden 2.0.0
+        - normal 1.2.3
+          - circular_a any
+          - transitive any
+
+        dev dependencies:
+        - unittest 1.2.3
+          - shared any
+
+        dependency overrides:
+        - override_only 1.2.3
+        - overridden 2.0.0
+
+        transitive dependencies:
+        - circular_a 1.2.3
+          - circular_b any
+        - circular_b 1.2.3
+          - circular_a any
+        - other 1.0.0
+        - shared 1.2.3
+          - other any
+        - transitive 1.2.3
+          - shared any
+        ''');
+  });
+
+  integration("lists dependencies in tree form", () {
+    pubGet();
+    schedulePub(args: ['deps'], output: '''
+        myapp 0.0.0
+        |-- from_path 1.2.3
+        |-- normal 1.2.3
+        |   |-- circular_a 1.2.3
+        |   |   '-- circular_b 1.2.3
+        |   |       '-- circular_a...
+        |   '-- transitive 1.2.3
+        |       '-- shared...
+        |-- overridden 2.0.0
+        |-- override_only 1.2.3
+        '-- unittest 1.2.3
+            '-- shared 1.2.3
+                '-- other 1.0.0
+        ''');
+  });
+}