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packages/dart_style/test/command_line_test.dart

Index: packages/dart_style/test/command_line_test.dart
diff --git a/packages/dart_style/test/command_line_test.dart b/packages/dart_style/test/command_line_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..de644490e4d69c44a6b85014eb722c4b6a346d47
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+++ b/packages/dart_style/test/command_line_test.dart
@@ -0,0 +1,190 @@
+// Copyright (c) 2014, 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 dart_style.test.command_line;
+
+import 'dart:convert';
+
+import 'package:path/path.dart' as p;
+import 'package:scheduled_test/descriptor.dart' as d;
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:scheduled_test/scheduled_stream.dart';
+
+import 'utils.dart';
+
+void main() {
+  setUpTestSuite();
+
+  test("Exits with 0 on success.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatterOnDir();
+    process.shouldExit(0);
+  });
+
+  test("Exits with 64 on a command line argument error.", () {
+    var process = runFormatterOnDir(["-wat"]);
+    process.shouldExit(64);
+  });
+
+  test("Exits with 65 on a parse error.", () {
+    d.dir("code", [d.file("a.dart", "herp derp i are a dart")]).create();
+
+    var process = runFormatterOnDir();
+    process.shouldExit(65);
+  });
+
+  test("Errors if --dry-run and --overwrite are both passed.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatterOnDir(["--dry-run", "--overwrite"]);
+    process.shouldExit(64);
+  });
+
+  test("Errors if --dry-run and --machine are both passed.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatterOnDir(["--dry-run", "--machine"]);
+    process.shouldExit(64);
+  });
+
+  test("Errors if --machine and --overwrite are both passed.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatterOnDir(["--machine", "--overwrite"]);
+    process.shouldExit(64);
+  });
+
+  test("Errors if --dry-run and --machine are both passed.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatter(["--dry-run", "--machine"]);
+    process.shouldExit(64);
+  });
+
+  test("Errors if --machine and --overwrite are both passed.", () {
+    d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+    var process = runFormatter(["--machine", "--overwrite"]);
+    process.shouldExit(64);
+  });
+
+  group("--dry-run", () {
+    test("prints names of files that would change.", () {
+      d.dir("code", [
+        d.file("a_bad.dart", unformattedSource),
+        d.file("b_good.dart", formattedSource),
+        d.file("c_bad.dart", unformattedSource),
+        d.file("d_good.dart", formattedSource)
+      ]).create();
+
+      var aBad = p.join("code", "a_bad.dart");
+      var cBad = p.join("code", "c_bad.dart");
+
+      var process = runFormatterOnDir(["--dry-run"]);
+
+      // The order isn't specified.
+      process.stdout.expect(either(aBad, cBad));
+      process.stdout.expect(either(aBad, cBad));
+      process.shouldExit();
+    });
+
+    test("does not modify files.", () {
+      d.dir("code", [d.file("a.dart", unformattedSource)]).create();
+
+      var process = runFormatterOnDir(["--dry-run"]);
+      process.stdout.expect(p.join("code", "a.dart"));
+      process.shouldExit();
+
+      d.dir('code', [d.file('a.dart', unformattedSource)]).validate();
+    });
+  });
+
+  group("--machine", () {
+    test("writes each output as json", () {
+      d.dir("code", [
+        d.file("a.dart", unformattedSource),
+        d.file("b.dart", unformattedSource)
+      ]).create();
+
+      var jsonA = JSON.encode({
+        "path": p.join("code", "a.dart"),
+        "source": formattedSource,
+        "selection": {"offset": -1, "length": -1}
+      });
+
+      var jsonB = JSON.encode({
+        "path": p.join("code", "b.dart"),
+        "source": formattedSource,
+        "selection": {"offset": -1, "length": -1}
+      });
+
+      var process = runFormatterOnDir(["--machine"]);
+
+      // The order isn't specified.
+      process.stdout.expect(either(jsonA, jsonB));
+      process.stdout.expect(either(jsonA, jsonB));
+      process.shouldExit();
+    });
+  });
+
+  group("--preserve", () {
+    test("errors if given paths.", () {
+      var process = runFormatter(["--preserve", "path", "another"]);
+      process.shouldExit(64);
+    });
+
+    test("errors on wrong number of components.", () {
+      var process = runFormatter(["--preserve", "1"]);
+      process.shouldExit(64);
+
+      process = runFormatter(["--preserve", "1:2:3"]);
+      process.shouldExit(64);
+    });
+
+    test("errors on non-integer component.", () {
+      var process = runFormatter(["--preserve", "1:2.3"]);
+      process.shouldExit(64);
+    });
+
+    test("updates selection.", () {
+      var process = runFormatter(["--preserve", "6:10", "-m"]);
+      process.writeLine(unformattedSource);
+      process.closeStdin();
+
+      var json = JSON.encode({
+        "path": "<stdin>",
+        "source": formattedSource,
+        "selection": {"offset": 5, "length": 9}
+      });
+
+      process.stdout.expect(json);
+      process.shouldExit();
+    });
+  });
+
+  group("with no paths", () {
+    test("errors on --overwrite.", () {
+      var process = runFormatter(["--overwrite"]);
+      process.shouldExit(64);
+    });
+
+    test("exits with 65 on parse error.", () {
+      var process = runFormatter();
+      process.writeLine("herp derp i are a dart");
+      process.closeStdin();
+      process.shouldExit(65);
+    });
+
+    test("reads from stdin.", () {
+      var process = runFormatter();
+      process.writeLine(unformattedSource);
+      process.closeStdin();
+
+      // No trailing newline at the end.
+      process.stdout.expect(formattedSource.trimRight());
+      process.shouldExit(0);
+    });
+  });
+}