class DiscoveryCachedTraitTest

class DiscoveryCachedTraitTest extends TestCase {
    
    /**
     * Data provider for testGetDefinition().
     *
     * @return array
     *   - Expected result from getDefinition().
     *   - Cached definitions to be placed into self::$definitions
     *   - Definitions to be returned by getDefinitions().
     *   - Plugin name to query for.
     */
    public static function providerGetDefinition() {
        return [
            [
                'definition',
                [],
                [
                    'plugin_name' => 'definition',
                ],
                'plugin_name',
            ],
            [
                'definition',
                [
                    'plugin_name' => 'definition',
                ],
                [],
                'plugin_name',
            ],
            [
                NULL,
                [
                    'plugin_name' => 'definition',
                ],
                [],
                'bad_plugin_name',
            ],
        ];
    }
    
    /**
     * @covers ::getDefinition
     * @dataProvider providerGetDefinition
     */
    public function testGetDefinition($expected, $cached_definitions, $get_definitions, $plugin_id) : void {
        $trait = $this->getMockBuilder(DiscoveryCachedTraitMockableClass::class)
            ->onlyMethods([
            'getDefinitions',
        ])
            ->getMock();
        $reflection_definitions = new \ReflectionProperty($trait, 'definitions');
        // getDefinition() needs the ::$definitions property to be set in one of two
        // ways: 1) As existing cached data, or 2) as a side-effect of calling
        // getDefinitions().
        // If there are no cached definitions, then we have to fake the side-effect
        // of getDefinitions().
        if (count($cached_definitions) < 1) {
            $trait->expects($this->once())
                ->method('getDefinitions')
                ->willReturnCallback(function () use ($reflection_definitions, $trait, $get_definitions) {
                $reflection_definitions->setValue($trait, $get_definitions);
                return $get_definitions;
            });
        }
        else {
            // Put $cached_definitions into our mocked ::$definitions.
            $reflection_definitions->setValue($trait, $cached_definitions);
        }
        // Call getDefinition(), with $exception_on_invalid always FALSE.
        $this->assertSame($expected, $trait->getDefinition($plugin_id, FALSE));
    }

}