final class IDDocParametrizedTest: XCTestSuite {

override class var `default`: XCTestSuite {

    let testSuite = XCTestSuite(name: "TestSuite")

    let fixtures = ["Form8", "Form_example"]

    for fixture in fixtures {
        let testCases = IDDocTest.createTestCases()
        for testCase in testCases {
            testCase.fixture = fixture
            testSuite.addTest(testCase)
        }
    }
    return testSuite
}
}

final class IDSDocumentTest: XCTestCase {

    class func createTestCases() -> [IDSDocumentTest] {
        return self.testInvocations.map { IDSDocumentTest(invocation: $0) }
    }

    var fixture = ""

    func testCover() { ... }
    func testCancelCover() { ... }
}