CRUDlexTests\EntityDefinitionTest::testGetSubTypeField PHP Method

    public function testGetSubTypeField()
    {
        $read = $this->definitionLibrary->getSubTypeField('libraryBook', 'many', 'entity');
        $expected = 'book';
        $this->assertSame($expected, $read);
        $read = $this->definitionLibrary->getSubTypeField('name', 'many', 'entity');
        $this->assertNull($read);
        $read = $this->definitionLibrary->getSubTypeField('libraryBook', 'many', 'foo');
        $this->assertNull($read);
        $read = $this->definitionLibrary->getSubTypeField('libraryBook', 'foo', 'entity');
        $this->assertNull($read);
        $read = $this->definitionLibrary->getSubTypeField('', 'many', 'entity');
        $this->assertNull($read);
        $read = $this->definitionLibrary->getSubTypeField(null, 'many', 'entity');
        $this->assertNull($read);
    }