--- /dev/null
+<?php
+
+namespace Drupal\Tests\Core\Extension;
+
+use Drupal\Core\Extension\InfoParser;
+use Drupal\Tests\UnitTestCase;
+use org\bovigo\vfs\vfsStream;
+
+/**
+ * Tests InfoParser class and exception.
+ *
+ * Files for this test are stored in core/modules/system/tests/fixtures and end
+ * with .info.txt instead of info.yml in order not not be considered as real
+ * extensions.
+ *
+ * @coversDefaultClass \Drupal\Core\Extension\InfoParser
+ *
+ * @group Extension
+ */
+class InfoParserUnitTest extends UnitTestCase {
+
+ /**
+ * The InfoParser object.
+ *
+ * @var \Drupal\Core\Extension\InfoParser
+ */
+ protected $infoParser;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->infoParser = new InfoParser();
+ }
+
+ /**
+ * Tests the functionality of the infoParser object.
+ *
+ * @covers ::parse
+ */
+ public function testInfoParserNonExisting() {
+ vfsStream::setup('modules');
+ $info = $this->infoParser->parse(vfsStream::url('modules') . '/does_not_exist.info.txt');
+ $this->assertTrue(empty($info), 'Non existing info.yml returns empty array.');
+ }
+
+ /**
+ * Test if correct exception is thrown for a broken info file.
+ *
+ * @covers ::parse
+ */
+ public function testInfoParserBroken() {
+ $broken_info = <<<BROKEN_INFO
+# info.yml for testing broken YAML parsing exception handling.
+name: File
+type: module
+description: 'Defines a file field type.'
+package: Core
+version: VERSION
+core: 8.x
+dependencies::;;
+ - field
+BROKEN_INFO;
+
+ vfsStream::setup('modules');
+ vfsStream::create([
+ 'fixtures' => [
+ 'broken.info.txt' => $broken_info,
+ ],
+ ]);
+ $filename = vfsStream::url('modules/fixtures/broken.info.txt');
+ $this->setExpectedException('\Drupal\Core\Extension\InfoParserException', 'broken.info.txt');
+ $this->infoParser->parse($filename);
+ }
+
+ /**
+ * Tests that missing required keys are detected.
+ *
+ * @covers ::parse
+ */
+ public function testInfoParserMissingKeys() {
+ $missing_keys = <<<MISSINGKEYS
+# info.yml for testing missing name, description, and type keys.
+package: Core
+version: VERSION
+dependencies:
+ - field
+MISSINGKEYS;
+
+ vfsStream::setup('modules');
+ vfsStream::create([
+ 'fixtures' => [
+ 'missing_keys.info.txt' => $missing_keys,
+ ],
+ ]);
+ $filename = vfsStream::url('modules/fixtures/missing_keys.info.txt');
+ $this->setExpectedException('\Drupal\Core\Extension\InfoParserException', 'Missing required keys (type, core, name) in vfs://modules/fixtures/missing_keys.info.txt');
+ $this->infoParser->parse($filename);
+ }
+
+ /**
+ * Tests that missing required key is detected.
+ *
+ * @covers ::parse
+ */
+ public function testInfoParserMissingKey() {
+ $missing_key = <<<MISSINGKEY
+# info.yml for testing missing type key.
+name: File
+description: 'Defines a file field type.'
+package: Core
+version: VERSION
+core: 8.x
+dependencies:
+ - field
+MISSINGKEY;
+
+ vfsStream::setup('modules');
+ vfsStream::create([
+ 'fixtures' => [
+ 'missing_key.info.txt' => $missing_key,
+ ],
+ ]);
+ $filename = vfsStream::url('modules/fixtures/missing_key.info.txt');
+ $this->setExpectedException('\Drupal\Core\Extension\InfoParserException', 'Missing required keys (type) in vfs://modules/fixtures/missing_key.info.txt');
+ $this->infoParser->parse($filename);
+ }
+
+ /**
+ * Tests common info file.
+ *
+ * @covers ::parse
+ */
+ public function testInfoParserCommonInfo() {
+ $common = <<<COMMONTEST
+core: 8.x
+name: common_test
+type: module
+description: 'testing info file parsing'
+simple_string: 'A simple string'
+version: "VERSION"
+double_colon: dummyClassName::method
+COMMONTEST;
+
+ vfsStream::setup('modules');
+ vfsStream::create([
+ 'fixtures' => [
+ 'common_test.info.txt' => $common,
+ ],
+ ]);
+ $info_values = $this->infoParser->parse(vfsStream::url('modules/fixtures/common_test.info.txt'));
+ $this->assertEquals($info_values['simple_string'], 'A simple string', 'Simple string value was parsed correctly.');
+ $this->assertEquals($info_values['version'], \Drupal::VERSION, 'Constant value was parsed correctly.');
+ $this->assertEquals($info_values['double_colon'], 'dummyClassName::method', 'Value containing double-colon was parsed correctly.');
+ }
+
+}