Add a Pub source that checks packages out from Git.

utils/tests/pub/test_pub.dart

Index: utils/tests/pub/test_pub.dart
diff --git a/utils/tests/pub/test_pub.dart b/utils/tests/pub/test_pub.dart
index e2fbfdb617cee88b1af09ac5754a3459833c64ab..2fcab1cada389ed7968df8e58669acb07843a20b 100644
--- a/utils/tests/pub/test_pub.dart
+++ b/utils/tests/pub/test_pub.dart
@@ -29,6 +29,12 @@ DirectoryDescriptor dir(String name, [List<Descriptor> contents]) =>
     new DirectoryDescriptor(name, contents);
 
 /**
+ * Creates a new [GitRepoDescriptor] with [name] and [contents].
+ */
+DirectoryDescriptor git(String name, [List<Descriptor> contents]) =>
+    new GitRepoDescriptor(name, contents);
+
+/**
  * The path of the package cache directory used for tests. Relative to the
  * sandbox directory.
  */
@@ -69,7 +75,7 @@ List<_ScheduledEvent> _scheduledBeforePub;
  */
 List<_ScheduledEvent> _scheduledAfterPub;
 
-void runPub([List<String> args, String output, int exitCode = 0]) {
+void runPub([List<String> args, Pattern output, int exitCode = 0]) {
   var createdSandboxDir;
 
   var asyncDone = expectAsync0(() {});
@@ -157,11 +163,19 @@ Future<ProcessResult> _runPub(List<String> pubArgs, String workingDir) {
 }
 
 /**
- * Compares the [actual] output from running pub with [expectedText]. Ignores
- * leading and trailing whitespace differences and tries to report the
- * offending difference in a nice way.
+ * 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(String expectedText, List<String> actual) {
+void _validateOutput(Pattern expected, List<String> actual) {
+  if (expected is String) return _validateOutputString(expected, actual);
+  var actualText = Strings.join(actual, "\n");
+  if (actualText.contains(expected)) return;
+  Expect.fail('Expected output to match "$expected", was:\n$actualText');
+}
+
+void _validateOutputString(String expectedText, List<String> actual) {
   final expected = expectedText.split('\n');
 
   // Strip off the last line. This lets us have expected multiline strings
@@ -230,7 +244,8 @@ class Descriptor {
    * Schedules the directory to be created before Pub is run with [runPub]. The
    * directory will be created relative to the sandbox directory.
    */
-  void scheduleCreate() => _scheduleBeforePub(create);
+  // TODO(nweiz): Use implicit closurization once issue 2984 is fixed.
+  void scheduleCreate() => _scheduleBeforePub((dir) => this.create(dir));
 
   /**
    * Schedules the directory to be validated after Pub is run with [runPub]. The
@@ -333,6 +348,35 @@ class DirectoryDescriptor extends Descriptor {
 }
 
 /**
+ * Describes a Git repository and its contents.
+ */
+class GitRepoDescriptor extends DirectoryDescriptor {
+  GitRepoDescriptor(String name, List<Descriptor> contents)
+  : super(name, contents);
+
+  /**
+   * Creates the Git repository and commits the contents.
+   */
+  Future<Directory> create(parentDir) {
+    var workingDir;
+    Future runGit(List<String> args) {
+      return runProcess('git', args, workingDir: workingDir.path).
+        transform((result) {
+          if (!result.success) throw "Error running git: ${result.stderr}";
+          return null;
+        });
+    }
+
+    return super.create(parentDir).chain((rootDir) {
+      workingDir = rootDir;
+      return runGit(['init']);
+    }).chain((_) => runGit(['add', '.']))
+      .chain((_) => runGit(['commit', '-m', 'initial commit']))
+      .transform((_) => workingDir);
+  }
+}
+
+/**
  * Schedules a callback to be called before Pub is run with [runPub].
  */
 void _scheduleBeforePub(_ScheduledEvent event) {