This is the ideal testing code to test VLCMedia::parse

VLCMediaNetworkingTest.swift

func testLength() {
        let tests: [(path: String, expected: VLCTime)] = [
            ("https://youtube.com/some_video_here", VLCTime(int: 12345)),
        ]

        for (path, expected) in tests {
            let media = VLCMedia(url: URL(string: path)!)
            let expection = self.expectation(description: "mediaDidFinishParsing called")
            let delegate = MockMediaDelegate(parseExpectation: expection)
            media.delegate = delegate  
          
            // How can this be mocked?
            // We should not make any networking calls in the unit test
            media.parse(withOptions: VLCMediaParsingOptions(VLCMediaParseNetwork))

            // Waiting for 5 seconds here is very fragile as well
            // e.g. tests in VLC-iOS sometimes fail here
            waitForExpectations(timeout: 5) { err in
                XCTAssertNil(err)
                XCTAssertEqual(media.length.intValue, expected.intValue)
            }
        }
    }