Command to print paths to dependencies.

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

 // 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.
 
 /// Test infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
@@ skipping 348 matching lines @@
 /// Schedules creating a symlink at path [symlink] that points to [target],
 /// both of which are assumed to be relative to [sandboxDir].
 void scheduleSymlink(String target, String symlink) {
   schedule(
       () => createSymlink(
           path.join(sandboxDir, target),
           path.join(sandboxDir, symlink)),
       'symlinking $target to $symlink');
 }
 
-/// Schedules a call to the Pub command-line utility. Runs Pub with [args] and
-/// validates that its results match [output], [error], and [exitCode].
-void schedulePub({List args, Pattern output, Pattern error,
+/// Schedules a call to the Pub command-line utility.
+///
+/// Runs Pub with [args] and validates that its results match [output] (or
+/// [outputJson]), [error], and [exitCode]. If [outputJson] is given, validates
+/// that pub outputs stringified JSON matching that object.
+void schedulePub({List args, Pattern output, Pattern error, outputJson,
     Future<Uri> tokenEndpoint, int exitCode: 0}) {
+  // Cannot pass both output and outputJson.
+  assert(output == null || outputJson == null);
+
   var pub = startPub(args: args, tokenEndpoint: tokenEndpoint);
   pub.shouldExit(exitCode);
 
+  var failures = [];
+  var stderr;
+
   expect(Future.wait([
     pub.remainingStdout(),
     pub.remainingStderr()
   ]).then((results) {
-    var failures = [];
-    _validateOutput(failures, 'stdout', output, results[0].split('\n'));
-    _validateOutput(failures, 'stderr', error, results[1].split('\n'));
+    stderr = results[1];
+
+    if (outputJson == null) {
+      _validateOutput(failures, 'stdout', output, results[0]);
+      return;
+    }
+
+    // Allow the expected JSON to contain futures.
+    return awaitObject(outputJson).then((resolved) {
+      _validateOutputJson(failures, 'stdout', resolved, results[0]);
+    });
+  }).then((_) {
+    _validateOutput(failures, 'stderr', error, stderr);
+
     if (!failures.isEmpty) throw new TestFailure(failures.join('\n'));
   }), completes);
 }
 
 /// Like [startPub], but runs `pub lish` in particular with [server] used both
 /// as the OAuth2 server (with "/token" as the token endpoint) and as the
 /// package server.
 ///
 /// Any futures in [args] will be resolved before the process is started.
 ScheduledProcess startPublish(ScheduledServer server, {List args}) {
@@ skipping 247 matching lines @@
   }
 
   return map;
 }
 
 /// Compares the [actual] output from running pub with [expected]. For [String]
 /// patterns, ignores leading and trailing whitespace differences and tries to
 /// report the offending difference in a nice way. For other [Pattern]s, just
 /// reports whether the output contained the pattern.
 void _validateOutput(List<String> failures, String pipe, Pattern expected,
-                     List<String> actual) {
+                     String actual) {
   if (expected == null) return;
 
+  var actualLines = actual.split("\n");
   if (expected is RegExp) {
-    _validateOutputRegex(failures, pipe, expected, actual);
+    _validateOutputRegex(failures, pipe, expected, actualLines);
   } else {
-    _validateOutputString(failures, pipe, expected, actual);
+    _validateOutputString(failures, pipe, expected, actualLines);
   }
 }
 
 void _validateOutputRegex(List<String> failures, String pipe,
                           RegExp expected, List<String> actual) {
   var actualText = actual.join('\n');
   if (actualText.contains(expected)) return;
 
   if (actual.length == 0) {
     failures.add('Expected $pipe to match "${expected.pattern}" but got none.');
@@ skipping 45 matching lines @@
 
   // If any lines mismatched, show the expected and actual.
   if (failed) {
     failures.add('Expected $pipe:');
     failures.addAll(expected.map((line) => '| $line'));
     failures.add('Got:');
     failures.addAll(results);
   }
 }
 
+void _validateOutputJson(List<String> failures, String pipe,
+                         expected, String actualText) {
+  var actual;
+  try {
+    actual = json.parse(actualText);
+  } on FormatException catch(error) {
+    failures.add('Expected $pipe JSON:');
+    failures.add(expected);
+    failures.add('Got invalid JSON:');
+    failures.add(actualText);
+  }
+
+  // Do a deep comparison of the JSON objects.
+  expect(actual, equals(expected));
+}
+
 /// A function that creates a [Validator] subclass.
 typedef Validator ValidatorCreator(Entrypoint entrypoint);
 
 /// Schedules a single [Validator] to run on the [appPath]. Returns a scheduled
 /// Future that contains the errors and warnings produced by that validator.
 Future<Pair<List<String>, List<String>>> schedulePackageValidation(
     ValidatorCreator fn) {
   return schedule(() {
     var cache = new SystemCache.withSources(path.join(sandboxDir, cachePath));
 
@@ skipping 19 matching lines @@
   bool matches(item, Map matchState) {
     if (item is! Pair) return false;
     return _firstMatcher.matches(item.first, matchState) &&
         _lastMatcher.matches(item.last, matchState);
   }
 
   Description describe(Description description) {
     description.addAll("(", ", ", ")", [_firstMatcher, _lastMatcher]);
   }
 }