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rARC/src/unit/engine/phutil/PhutilTestCase.php
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PhutilTestCase.php
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<?php
/**
* Base test case for the very simple libphutil test framework.
*
* @task assert Making Test Assertions
* @task exceptions Exception Handling
* @task hook Hooks for Setup and Teardown
* @task internal Internals
*/
abstract class PhutilTestCase extends Phobject {
private $assertions = 0;
private $runningTest;
private $testStartTime;
private $results = array();
private $enableCoverage;
private $coverage = array();
private $workingCopy;
private $paths;
private $renderer;
private static $executables = array();
/* -( Making Test Assertions )--------------------------------------------- */
/**
* Assert that a value is `false`, strictly. The test fails if it is not.
*
* @param wild The empirically derived value, generated by executing the
* test.
* @param string A human-readable description of what these values represent,
* and particularly of what a discrepancy means.
*
* @return void
* @task assert
*/
final protected function assertFalse($result, $message = null) {
if ($result === false) {
$this->assertions++;
return;
}
$this->failAssertionWithExpectedValue('false', $result, $message);
}
/**
* Assert that a value is `true`, strictly. The test fails if it is not.
*
* @param wild The empirically derived value, generated by executing the
* test.
* @param string A human-readable description of what these values represent,
* and particularly of what a discrepancy means.
*
* @return void
* @task assert
*/
final protected function assertTrue($result, $message = null) {
if ($result === true) {
$this->assertions++;
return;
}
$this->failAssertionWithExpectedValue('true', $result, $message);
}
/**
* Assert that two values are equal, strictly. The test fails if they are not.
*
* NOTE: This method uses PHP's strict equality test operator (`===`) to
* compare values. This means values and types must be equal, key order must
* be identical in arrays, and objects must be referentially identical.
*
* @param wild The theoretically expected value, generated by careful
* reasoning about the properties of the system.
* @param wild The empirically derived value, generated by executing the
* test.
* @param string A human-readable description of what these values represent,
* and particularly of what a discrepancy means.
*
* @return void
* @task assert
*/
final protected function assertEqual($expect, $result, $message = null) {
if ($expect === $result) {
$this->assertions++;
return;
}
$expect = PhutilReadableSerializer::printableValue($expect);
$result = PhutilReadableSerializer::printableValue($result);
$caller = self::getCallerInfo();
$file = $caller['file'];
$line = $caller['line'];
if ($message !== null) {
$output = pht(
'Assertion failed, expected values to be equal (at %s:%d): %s',
$file,
$line,
$message);
} else {
$output = pht(
'Assertion failed, expected values to be equal (at %s:%d).',
$file,
$line);
}
$output .= "\n";
if (strpos($expect, "\n") === false && strpos($result, "\n") === false) {
$output .= pht("Expected: %s\n Actual: %s", $expect, $result);
} else {
$output .= pht(
"Expected vs Actual Output Diff\n%s",
ArcanistDiffUtils::renderDifferences(
$expect,
$result,
$lines = 0xFFFF));
}
$this->failTest($output);
throw new PhutilTestTerminatedException($output);
}
/**
* Assert an unconditional failure. This is just a convenience method that
* better indicates intent than using dummy values with assertEqual(). This
* causes test failure.
*
* @param string Human-readable description of the reason for test failure.
* @return void
* @task assert
*/
final protected function assertFailure($message) {
$this->failTest($message);
throw new PhutilTestTerminatedException($message);
}
/**
* End this test by asserting that the test should be skipped for some
* reason.
*
* @param string Reason for skipping this test.
* @return void
* @task assert
*/
final protected function assertSkipped($message) {
$this->skipTest($message);
throw new PhutilTestSkippedException($message);
}
/* -( Exception Handling )------------------------------------------------- */
/**
* This simplest way to assert exceptions are thrown.
*
* @param exception The expected exception.
* @param callable The thing which throws the exception.
*
* @return void
* @task exceptions
*/
final protected function assertException(
$expected_exception_class,
$callable) {
$this->tryTestCases(
array('assertException' => array()),
array(false),
$callable,
$expected_exception_class);
}
/**
* Straightforward method for writing unit tests which check if some block of
* code throws an exception. For example, this allows you to test the
* exception behavior of ##is_a_fruit()## on various inputs:
*
* public function testFruit() {
* $this->tryTestCases(
* array(
* 'apple is a fruit' => new Apple(),
* 'rock is not a fruit' => new Rock(),
* ),
* array(
* true,
* false,
* ),
* array($this, 'tryIsAFruit'),
* 'NotAFruitException');
* }
*
* protected function tryIsAFruit($input) {
* is_a_fruit($input);
* }
*
* @param map Map of test case labels to test case inputs.
* @param list List of expected results, true to indicate that the case
* is expected to succeed and false to indicate that the case
* is expected to throw.
* @param callable Callback to invoke for each test case.
* @param string Optional exception class to catch, defaults to
* 'Exception'.
* @return void
* @task exceptions
*/
final protected function tryTestCases(
array $inputs,
array $expect,
$callable,
$exception_class = 'Exception') {
if (count($inputs) !== count($expect)) {
$this->assertFailure(
pht('Input and expectations must have the same number of values.'));
}
$labels = array_keys($inputs);
$inputs = array_values($inputs);
$expecting = array_values($expect);
foreach ($inputs as $idx => $input) {
$expect = $expecting[$idx];
$label = $labels[$idx];
$caught = null;
try {
call_user_func($callable, $input);
} catch (Exception $ex) {
if ($ex instanceof PhutilTestTerminatedException) {
throw $ex;
}
if (!($ex instanceof $exception_class)) {
throw $ex;
}
$caught = $ex;
}
$actual = !($caught instanceof Exception);
if ($expect === $actual) {
if ($expect) {
$message = pht("Test case '%s' did not throw, as expected.", $label);
} else {
$message = pht("Test case '%s' threw, as expected.", $label);
}
} else {
if ($expect) {
$message = pht(
"Test case '%s' was expected to succeed, but it ".
"raised an exception of class %s with message: %s",
$label,
get_class($ex),
$ex->getMessage());
} else {
$message = pht(
"Test case '%s' was expected to raise an ".
"exception, but it did not throw anything.",
$label);
}
}
$this->assertEqual($expect, $actual, $message);
}
}
/**
* Convenience wrapper around @{method:tryTestCases} for cases where your
* inputs are scalar. For example:
*
* public function testFruit() {
* $this->tryTestCaseMap(
* array(
* 'apple' => true,
* 'rock' => false,
* ),
* array($this, 'tryIsAFruit'),
* 'NotAFruitException');
* }
*
* protected function tryIsAFruit($input) {
* is_a_fruit($input);
* }
*
* For cases where your inputs are not scalar, use @{method:tryTestCases}.
*
* @param map Map of scalar test inputs to expected success (true
* expects success, false expects an exception).
* @param callable Callback to invoke for each test case.
* @param string Optional exception class to catch, defaults to
* 'Exception'.
* @return void
* @task exceptions
*/
final protected function tryTestCaseMap(
array $map,
$callable,
$exception_class = 'Exception') {
return $this->tryTestCases(
array_fuse(array_keys($map)),
array_values($map),
$callable,
$exception_class);
}
/* -( Hooks for Setup and Teardown )--------------------------------------- */
/**
* This hook is invoked once, before any tests in this class are run. It
* gives you an opportunity to perform setup steps for the entire class.
*
* @return void
* @task hook
*/
protected function willRunTests() {
return;
}
/**
* This hook is invoked once, after any tests in this class are run. It gives
* you an opportunity to perform teardown steps for the entire class.
*
* @return void
* @task hook
*/
protected function didRunTests() {
return;
}
/**
* This hook is invoked once per test, before the test method is invoked.
*
* @param string Method name of the test which will be invoked.
* @return void
* @task hook
*/
protected function willRunOneTest($test_method_name) {
return;
}
/**
* This hook is invoked once per test, after the test method is invoked.
*
* @param string Method name of the test which was invoked.
* @return void
* @task hook
*/
protected function didRunOneTest($test_method_name) {
return;
}
/**
* This hook is invoked once, before any test cases execute. It gives you
* an opportunity to perform setup steps for the entire suite of test cases.
*
* @param list<PhutilTestCase> List of test cases to be run.
* @return void
* @task hook
*/
public function willRunTestCases(array $test_cases) {
return;
}
/**
* This hook is invoked once, after all test cases execute.
*
* @param list<PhutilTestCase> List of test cases that ran.
* @return void
* @task hook
*/
public function didRunTestCases(array $test_cases) {
return;
}
/* -( Internals )---------------------------------------------------------- */
/**
* Construct a new test case. This method is ##final##, use willRunTests() to
* provide test-wide setup logic.
*
* @task internal
*/
final public function __construct() {}
/**
* Mark the currently-running test as a failure.
*
* @param string Human-readable description of problems.
* @return void
*
* @task internal
*/
private function failTest($reason) {
$this->resultTest(ArcanistUnitTestResult::RESULT_FAIL, $reason);
}
/**
* This was a triumph. I'm making a note here: HUGE SUCCESS.
*
* @param string Human-readable overstatement of satisfaction.
* @return void
*
* @task internal
*/
private function passTest($reason) {
$this->resultTest(ArcanistUnitTestResult::RESULT_PASS, $reason);
}
/**
* Mark the current running test as skipped.
*
* @param string Description for why this test was skipped.
* @return void
* @task internal
*/
private function skipTest($reason) {
$this->resultTest(ArcanistUnitTestResult::RESULT_SKIP, $reason);
}
private function resultTest($test_result, $reason) {
$coverage = $this->endCoverage();
$result = new ArcanistUnitTestResult();
$result->setCoverage($coverage);
$result->setNamespace(get_class($this));
$result->setName($this->runningTest);
$result->setLink($this->getLink($this->runningTest));
$result->setResult($test_result);
$result->setDuration(microtime(true) - $this->testStartTime);
$result->setUserData($reason);
$this->results[] = $result;
if ($this->renderer) {
echo $this->renderer->renderUnitResult($result);
}
}
/**
* Execute the tests in this test case. You should not call this directly;
* use @{class:PhutilUnitTestEngine} to orchestrate test execution.
*
* @return void
* @task internal
*/
final public function run() {
$this->results = array();
$reflection = new ReflectionClass($this);
$methods = $reflection->getMethods();
// Try to ensure that poorly-written tests which depend on execution order
// (and are thus not properly isolated) will fail.
shuffle($methods);
$this->willRunTests();
foreach ($methods as $method) {
$name = $method->getName();
if (preg_match('/^test/', $name)) {
$this->runningTest = $name;
$this->assertions = 0;
$this->testStartTime = microtime(true);
try {
$this->willRunOneTest($name);
$this->beginCoverage();
$exceptions = array();
try {
call_user_func_array(
array($this, $name),
array());
$this->passTest(
pht(
'%s assertion(s) passed.',
new PhutilNumber($this->assertions)));
} catch (Exception $ex) {
$exceptions['Execution'] = $ex;
}
try {
$this->didRunOneTest($name);
} catch (Exception $ex) {
$exceptions['Shutdown'] = $ex;
}
if ($exceptions) {
if (count($exceptions) == 1) {
throw head($exceptions);
} else {
throw new PhutilAggregateException(
pht('Multiple exceptions were raised during test execution.'),
$exceptions);
}
}
if (!$this->assertions) {
$this->failTest(
pht(
'This test case made no assertions. Test cases must make at '.
'least one assertion.'));
}
} catch (PhutilTestTerminatedException $ex) {
// Continue with the next test.
} catch (PhutilTestSkippedException $ex) {
// Continue with the next test.
} catch (Exception $ex) {
$ex_class = get_class($ex);
$ex_message = $ex->getMessage();
$ex_trace = $ex->getTraceAsString();
$message = sprintf(
"%s (%s): %s\n%s",
pht('EXCEPTION'),
$ex_class,
$ex_message,
$ex_trace);
$this->failTest($message);
}
}
}
$this->didRunTests();
return $this->results;
}
final public function setEnableCoverage($enable_coverage) {
$this->enableCoverage = $enable_coverage;
return $this;
}
/**
* @phutil-external-symbol function xdebug_start_code_coverage
*/
private function beginCoverage() {
if (!$this->enableCoverage) {
return;
}
$this->assertCoverageAvailable();
xdebug_start_code_coverage(XDEBUG_CC_UNUSED | XDEBUG_CC_DEAD_CODE);
}
/**
* @phutil-external-symbol function xdebug_get_code_coverage
* @phutil-external-symbol function xdebug_stop_code_coverage
*/
private function endCoverage() {
if (!$this->enableCoverage) {
return;
}
$result = xdebug_get_code_coverage();
xdebug_stop_code_coverage($cleanup = false);
$coverage = array();
foreach ($result as $file => $report) {
$project_root = $this->getProjectRoot();
if (strncmp($file, $project_root, strlen($project_root))) {
continue;
}
$max = max(array_keys($report));
$str = '';
for ($ii = 1; $ii <= $max; $ii++) {
$c = null;
if (isset($report[$ii])) {
$c = $report[$ii];
}
if ($c === -1) {
$str .= 'U'; // Un-covered.
} else if ($c === -2) {
// TODO: This indicates "unreachable", but it flags the closing braces
// of functions which end in "return", which is super ridiculous. Just
// ignore it for now.
//
// See http://bugs.xdebug.org/view.php?id=1041
$str .= 'N'; // Not executable.
} else if ($c === 1) {
$str .= 'C'; // Covered.
} else {
$str .= 'N'; // Not executable.
}
}
$coverage[substr($file, strlen($project_root) + 1)] = $str;
}
// Only keep coverage information for files modified by the change. In
// the case of --everything, we won't have paths, so just return all the
// coverage data.
if ($this->paths) {
$coverage = array_select_keys($coverage, $this->paths);
}
return $coverage;
}
private function assertCoverageAvailable() {
if (!function_exists('xdebug_start_code_coverage')) {
throw new Exception(
pht("You've enabled code coverage but XDebug is not installed."));
}
}
final public function getWorkingCopy() {
return $this->workingCopy;
}
final public function setWorkingCopy(
ArcanistWorkingCopyIdentity $working_copy) {
$this->workingCopy = $working_copy;
return $this;
}
final public function getProjectRoot() {
$working_copy = $this->getWorkingCopy();
if (!$working_copy) {
throw new PhutilInvalidStateException('setWorkingCopy');
}
return $working_copy->getProjectRoot();
}
final public function setPaths(array $paths) {
$this->paths = $paths;
return $this;
}
final protected function getLink($method) {
$base_uri = $this
->getWorkingCopy()
->getProjectConfig('phabricator.uri');
$uri = id(new PhutilURI($base_uri))
->setPath("/diffusion/symbol/{$method}/")
->setQueryParam('context', get_class($this))
->setQueryParam('jump', 'true')
->setQueryParam('lang', 'php');
return (string)$uri;
}
final public function setRenderer(ArcanistUnitRenderer $renderer) {
$this->renderer = $renderer;
return $this;
}
/**
* Returns info about the caller function.
*
* @return map
*/
private static function getCallerInfo() {
$callee = array();
$caller = array();
$seen = false;
foreach (array_slice(debug_backtrace(), 1) as $location) {
$function = idx($location, 'function');
if (!$seen && preg_match('/^assert[A-Z]/', $function)) {
$seen = true;
$caller = $location;
} else if ($seen && !preg_match('/^assert[A-Z]/', $function)) {
$callee = $location;
break;
}
}
return array(
'file' => basename(idx($caller, 'file')),
'line' => idx($caller, 'line'),
'function' => idx($callee, 'function'),
'class' => idx($callee, 'class'),
'object' => idx($caller, 'object'),
'type' => idx($callee, 'type'),
'args' => idx($caller, 'args'),
);
}
/**
* Fail an assertion which checks that some result is equal to a specific
* value, like 'true' or 'false'. This prints a readable error message and
* fails the current test.
*
* This method throws and does not return.
*
* @param string Human readable description of the expected value.
* @param string The actual value.
* @param string|null Optional assertion message.
* @return void
* @task internal
*/
private function failAssertionWithExpectedValue(
$expect_description,
$actual_result,
$message) {
$caller = self::getCallerInfo();
$file = $caller['file'];
$line = $caller['line'];
if ($message !== null) {
$description = pht(
"Assertion failed, expected '%s' (at %s:%d): %s",
$expect_description,
$file,
$line,
$message);
} else {
$description = pht(
"Assertion failed, expected '%s' (at %s:%d).",
$expect_description,
$file,
$line);
}
$actual_result = PhutilReadableSerializer::printableValue($actual_result);
$header = pht('ACTUAL VALUE');
$output = $description."\n\n".$header."\n".$actual_result;
$this->failTest($output);
throw new PhutilTestTerminatedException($output);
}
final protected function assertExecutable($binary) {
if (!isset(self::$executables[$binary])) {
switch ($binary) {
case 'xhpast':
$ok = true;
if (!PhutilXHPASTBinary::isAvailable()) {
try {
PhutilXHPASTBinary::build();
} catch (Exception $ex) {
$ok = false;
}
}
break;
default:
$ok = Filesystem::binaryExists($binary);
break;
}
self::$executables[$binary] = $ok;
}
if (!self::$executables[$binary]) {
$this->assertSkipped(
pht('Required executable "%s" is not available.', $binary));
}
}
final protected function getSupportExecutable($executable) {
$root = dirname(phutil_get_library_root('arcanist'));
return $root.'/support/unit/'.$executable.'.php';
}
}

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