testing_example_2.swift

class CryptoCompareResponseTests: XCTestCase {
    func test_deserialization() {
        
        let path = Bundle(for: CryptoCompareResponseTests.self).path(forResource: "CryptoCompareResponse", ofType: "json")!
        let examplePayload = try! Data(contentsOf: URL(fileURLWithPath: path))
        
        guard let response = try? JSONDecoder().decode(CryptoCompareResponse.self, from: examplePayload) else {
            XCTFail("Was unable to decode the data from the payload")
            return
        }
        
        guard response.data.count == 3 else {
            XCTFail("Expected there to be 3 data points, but got \(response.data.count)")
            return
        }
        
        XCTAssertEqual(response.data[0].time, 1515801600)
        XCTAssertEqual(response.data[0].closingPrice, 1272.88, accuracy: 0.01)
        
        XCTAssertEqual(response.data[1].time, 1516060800)
        XCTAssertEqual(response.data[2].time, 1516320000)
    }
}

testing_example_one.swift

describe("Setup handling") {
    afterEach {
        let workingDirectory = self.rootTestDirectory
        try? FileManager.default.removeItem(atPath: "\(workingDirectory)/muter.conf.json")
    }

    it("creates a configuration file named muter.conf.json with placeholder values in a specified directory") {
        let workingDirectory = self.rootTestDirectory

        guard let _ = try? setupMuter(using: FileManager.default, and: workingDirectory),
            let contents = FileManager.default.contents(atPath: "\(workingDirectory)/muter.conf.json"),
            let _ = try? JSONDecoder().decode(MuterConfiguration.self, from: contents) else {

                fail("Expected a valid configuration file to be written")
                return
        }
    }
}