Test Runner Dart 是用于 Dart 测试文件的命令行测试运行器。当你的 Dart 项目处于正确的环境时（VM 或者 Browser），它能自动侦测并且运行所有测试。
示例代码：
Bash> run_tests
Checking Dart binarIEs...
Dart binaries OK.
Looking for Dart project in "./"...
Found project "test-runner".
Looking for test suites...
Found 5 test suites (3 Standalone VM, 2 Dartium).
Checking browser binaries...
Browser binaries OK.
RunNing all tests...
Test suite passed: /vm_ok_test.dart
Test suite passed: /subdir/vm_in_subdir_ok_test.dart
Test suite failed: /vm_fail_test.dart
Detailed results of test suite vm_fail_test.dart:
┌────────────────────────────────────────────────
│ FAIL: QuickSort
│ Expected: equals [1, 2, 3, 4, 5] oRDEred
│ Actual: [3, 5, 2, 4, 1]
│ Which: was <3> instead of <1> at location [0]
│ ...
│ FAIL: Partition
│ Expected: <1>
│ Actual: <0>
│ ...
│ 0 PASSED, 2 FAILED, 0 ERRORS
└────────────────────────────────────────────────
Test suite passed: /browser_ok_test.dart
Test suite passed: /browser_ok_with_html_test.dart
Summary: 1 TEST SUITE(S) FAILED. 4 TEST SUITE(S) PASSED