move version test to a proper test

diff --git a/pkgs/markdown/test/version_test.dart b/pkgs/markdown/test/version_test.dart
new file mode 100644
index 0000000..36fcfd3
--- /dev/null
+++ b/pkgs/markdown/test/version_test.dart

@@ -0,0 +1,30 @@
+import 'dart:io';
+import 'dart:mirrors';
+
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+import 'package:yaml/yaml.dart';
+
+// Locate the "tool" directory. Use mirrors so that this works with the test
+// package, which loads this suite into an isolate.
+String get _currentDir => p
+    .dirname((reflect(main) as ClosureMirror).function.location.sourceUri.path);
+
+void main() {
+  test('check versions', () {
+    var binary = p.normalize(p.join(_currentDir, '..', 'bin/markdown.dart'));
+    var result = Process.runSync('dart', [binary, '--version']);
+    expect(result.exitCode, 0);
+
+    var binVersion = (result.stdout as String).trim();
+
+    var pubspecFile = p.normalize(p.join(_currentDir, '..', 'pubspec.yaml'));
+
+    var pubspecContent =
+        loadYaml(new File(pubspecFile).readAsStringSync()) as YamlMap;
+
+    expect(binVersion, pubspecContent['version'],
+        reason: 'The version reported by bin/markdown.dart '
+            'should match the version in pubspec.');
+  });
+}

diff --git a/pkgs/markdown/tool/travis.sh b/pkgs/markdown/tool/travis.sh
index 1d55ade..924c102 100755
--- a/pkgs/markdown/tool/travis.sh
+++ b/pkgs/markdown/tool/travis.sh

@@ -20,15 +20,3 @@
 else
   echo All Dart source files are formatted.
 fi
-
-# Assert that versions match.
-pubspec_version=$(awk '/^version:/' pubspec.yaml |cut -f2 -d' ')
-bin_version=$(dart bin/markdown.dart --version )
-if [[ $pubspec_version != $bin_version ]]; then
-  echo Version mismatch:
-  echo "    From pubspec.yaml:         $pubspec_version"
-  echo "    From lib/src/version.dart: $bin_version"
-  exit 1
-else
-  echo Package versions match.
-fi