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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -408,6 +408,7 @@
'ArcanistXMLLinterTestCase' => 'lint/linter/__tests__/ArcanistXMLLinterTestCase.php',
'ArcanistXUnitTestResultParser' => 'unit/parser/ArcanistXUnitTestResultParser.php',
'CSharpToolsTestEngine' => 'unit/engine/CSharpToolsTestEngine.php',
+ 'MidjeUnitTestEngine' => 'unit/engine/MidjeUnitTestEngine.php',
'NoseTestEngine' => 'unit/engine/NoseTestEngine.php',
'PhpunitTestEngine' => 'unit/engine/PhpunitTestEngine.php',
'PhpunitTestEngineTestCase' => 'unit/engine/__tests__/PhpunitTestEngineTestCase.php',
@@ -822,6 +823,7 @@
'ArcanistXMLLinterTestCase' => 'ArcanistLinterTestCase',
'ArcanistXUnitTestResultParser' => 'Phobject',
'CSharpToolsTestEngine' => 'XUnitTestEngine',
+ 'MidjeUnitTestEngine' => 'ArcanistUnitTestEngine',
'NoseTestEngine' => 'ArcanistUnitTestEngine',
'PhpunitTestEngine' => 'ArcanistUnitTestEngine',
'PhpunitTestEngineTestCase' => 'PhutilTestCase',
diff --git a/src/unit/engine/MidjeUnitTestEngine.php b/src/unit/engine/MidjeUnitTestEngine.php
new file mode 100644
--- /dev/null
+++ b/src/unit/engine/MidjeUnitTestEngine.php
@@ -0,0 +1,211 @@
+<?php
+
+/**
+ * Very basic unit test engine which runs libphutil tests.
+ */
+final class MidjeUnitTestEngine extends ArcanistUnitTestEngine {
+
+ public function getEngineConfigurationName() {
+ return 'midje';
+ }
+
+ protected function supportsRunAllTests() {
+ return true;
+ }
+
+ public function shouldEchoTestResults() {
+ return false;
+ }
+
+ public function run() {
+ if ($this->getRunAllTests()) {
+ $run_tests = $this->getAllTests();
+ } else {
+ $run_tests = $this->getTestsForPaths();
+ }
+
+ if (!$run_tests) {
+ throw new ArcanistNoEffectException(pht('No tests to run.'));
+ }
+
+ $midje_config = new TempFile();
+ Filesystem::writeFile($midje_config,
+<<<CFG
+(change-defaults
+ :emitter 'midje.emission.plugins.junit
+ :colorize false)
+CFG
+);
+
+ try {
+ list($stdout, $stderr) = execx('lein midje %C :config %s',
+ implode(' ', $run_tests),
+ $midje_config);
+ } catch (CommandException $e) {
+ // Handle only special error codes (see e.g. `man 1 bash` about
+ // "EXIT STATUS")
+ if ($e->getError() > 125) {
+ throw $e;
+ }
+ }
+
+ $results = array();
+ foreach ($run_tests as $test) {
+ $xunit_report = 'target/surefire-reports/TEST-'.$test.'.xml';
+ $cover_report = '';
+
+ $results[] = $this->parseTestResults(
+ $test,
+ $xunit_report,
+ $cover_report);
+ }
+
+ return array_mergev($results);
+ }
+
+ private function parseTestResults($test, $xunit_report, $cover_report) {
+ $xunit_results = Filesystem::readFile($xunit_report);
+ return id(new ArcanistXUnitTestResultParser())
+ ->parseTestResults($xunit_results);
+ }
+
+ private $clojureExtensions = array('clj', 'cljs', 'cljc');
+
+ private function isSupportedFileType($path) {
+ $extension = idx(pathinfo($path), 'extension');
+ foreach ($this->clojureExtensions as $clojure_extension) {
+ if ($extension == $clojure_extension) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ // FIXME This list should actually be retrieved from `:test-paths` in
+ // "project.clj"
+ private $projectTestPaths = array('test');
+
+ private $testPrefix = 'test_';
+ private $testSuffix = '';
+
+ /**
+ * Small convenience wrapper around `pathinfo()`.
+ */
+ private static function stripFileExtension($path) {
+ $path_info = pathinfo($path);
+ return $path_info['dirname'].'/'.$path_info['filename'];
+ }
+
+ /**
+ * Small convenience function to remove a given prefix from a path.
+ */
+ private static function stripPathPrefix($path, $prefix) {
+ $prefix = $prefix.'/';
+ $prefix_len = strlen($prefix);
+ if (substr($path, 0, $prefix_len) == $prefix) {
+ return substr($path, $prefix_len);
+ }
+ }
+
+ /**
+ * For a given test file, figure out the namespace it contains.
+ *
+ * @param $path string Filename with extension and prefix
+ * @param $path_prefixes list<string> List of possible prefixes the file
+ * might be in
+ * @return string Namespace
+ */
+ private static function pathToNamespace($path) {
+ $path = self::stripFileExtension($path);
+ $namespace = str_replace('_', '-', $path);
+ $namespace = str_replace('/', '.', $namespace);
+ return $namespace;
+ }
+
+ /**
+ * For a given path, figure out the corresponding test case's namespace.
+ *
+ * @param $path string Path of the file to be tested.
+ * @return string or null Namespace of the test case, if any.
+ */
+ private function pathToTest($path) {
+ $path_info = pathinfo($path);
+ $base_test_path = $path_info['dirname'].'/'.
+ $this->testPrefix.$path_info['filename'].$this->testSuffix.
+ '.'.$path_info['extension'];
+
+ while ($base_test_path) {
+ foreach ($this->projectTestPaths as $test_path_prefix) {
+ $test_path = $test_path_prefix.'/'.$base_test_path;
+ if (is_readable($test_path)) {
+ return self::pathToNamespace($base_test_path);
+ }
+ }
+
+ // FIXME This could be simplified and sped up, if we had `:source-paths`
+ // from "project.clj".
+ $next_pos = strpos($base_test_path, DIRECTORY_SEPARATOR);
+ if (!$next_pos) {
+ return;
+ }
+ $base_test_path = substr($base_test_path, $next_pos + 1);
+ }
+
+ return;
+ }
+
+ /**
+ * Retrieve all test cases.
+ *
+ * @return list<string> The names of the test case namespaces to be executed.
+ */
+ private function getAllTests() {
+ $test_paths = array();
+ foreach ($this->projectTestPaths as $test_path_prefix) {
+ foreach ($this->clojureExtensions as $extension) {
+ // FIXME This could benefit from array_combine+array_map in PHP 5.4
+ $test_paths_in_prefix = glob($test_path_prefix.'/**/*.'.$extension);
+ foreach ($test_paths_in_prefix as $test_path) {
+ $base_path = self::stripPathPrefix($test_path, $test_path_prefix);
+ $test_paths[$base_path] = $test_path;
+ }
+ }
+ }
+
+ $run_tests = array();
+ foreach ($test_paths as $base_path => $test_path) {
+ $test = self::pathToNamespace($base_path);
+ if ($test) {
+ $run_tests[] = $test;
+ }
+ }
+
+ return $run_tests;
+ }
+
+ /**
+ * Retrieve all relevant test cases.
+ *
+ * For every affected file, it looks for a corresponding test case namespace
+ * with a `-test` suffix.
+ *
+ * @return list<string> The names of the test case namespaces to be executed.
+ */
+ private function getTestsForPaths() {
+ $run_tests = array();
+ foreach ($this->getPaths() as $path) {
+ if (!$this->isSupportedFileType($path)) {
+ continue;
+ }
+
+ $test = $this->pathToTest($path);
+ if ($test) {
+ $run_tests[] = $test;
+ }
+ }
+
+ return $run_tests;
+ }
+
+}

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