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DataLoadableResultAdapterTests.swift
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DataLoadableResultAdapterTests.swift
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//
// DataLoadableResultAdapterTests.swift
// Scout
//
// Created by Brian Gerstle on 6/30/19.
//
import XCTest
@testable import ExampleProject
import Scout
class DataLoadableResultAdapterTests : XCTestCase {
var mockResumable: MockResumable!
var mockDataLoadable: MockDataLoadable!
var result: Result<(Data, URLResponse), Error>!
override func setUp() {
super.setUp()
continueAfterFailure = false
mockResumable = MockResumable()
mockDataLoadable = MockDataLoadable()
result = nil
}
func testSuccessfulResult() {
let url = URL(string: "http://example.com/foo")!,
data = "foo".data(using: .utf8)!,
urlResponse = HTTPURLResponse(
url: url,
statusCode: 200,
httpVersion: "1.1",
headerFields: nil
)!
mockDataLoadable
.expect
.dataTask(with: equalTo(url), completionHandler: any())
.to(complete(withData: data,
urlResponse: urlResponse,
error: nil))
let resumable = mockDataLoadable.dataTask(with: url, resultHandler: self.setResult)
XCTAssert(resumable === mockResumable)
mockDataLoadable.verify()
XCTAssertNotNil(result)
XCTAssertNoThrow(try result.get())
let (actualData, actualResponse) = try! result.get()
XCTAssertEqual(actualData, data)
if let actualHttpUrlResponse = actualResponse as? HTTPURLResponse {
XCTAssertEqual(actualHttpUrlResponse, urlResponse)
} else {
XCTFail("Unexpected response \(actualResponse)")
}
}
func testErrorResult() {
let url = URL(string: "http://example.com/foo")!,
error = NSError(
domain: URLError.errorDomain,
code: URLError.cannotFindHost.rawValue,
userInfo: nil
)
mockDataLoadable
.expect
.dataTask(with: equalTo(url), completionHandler: any())
.to(complete(withData: nil,
urlResponse: nil,
error: error))
let _ = mockDataLoadable.dataTask(with: url, resultHandler: self.setResult)
mockDataLoadable.verify()
XCTAssertNotNil(result)
XCTAssertThrowsError(try result.get()) { actualError in
XCTAssertEqual((actualError as NSError), error)
}
}
func testServerErrorResponse() {
let url = URL(string: "http://example.com/foo")!,
urlResponse = HTTPURLResponse(
url: url,
statusCode: 500,
httpVersion: "1.1",
headerFields: nil
)!
mockDataLoadable
.expect
.dataTask(with: equalTo(url), completionHandler: any())
.to(complete(withData: nil,
urlResponse: urlResponse,
error: nil))
let _ = mockDataLoadable.dataTask(with: url, resultHandler: self.setResult)
mockDataLoadable.verify()
XCTAssertNotNil(result)
XCTAssertThrowsError(try result.get()) { actualError in
guard let actualURLLoadError = actualError as? URLLoadError else {
XCTFail("Unexpected error \(actualError)")
return
}
if case let URLLoadError.badResponse(actualURLResponse) = actualURLLoadError {
XCTAssertEqual(actualURLResponse, urlResponse)
} else {
XCTFail("Unexpected URLLoadError \(actualURLLoadError)")
}
}
}
// MARK: - Helpers
func complete(
withData data: Data?,
urlResponse: URLResponse?,
error: Error? = nil,
file: StaticString = #file,
line: UInt = #line
) -> FuncExpectationBlock {
return { args in
guard let completionHandler = args[1].value as? DataLoadableCompletionHandler else {
XCTFail("completion handler has wrong type", file: file, line: line)
return nil
}
completionHandler(data, urlResponse, error)
return self.mockResumable
}
}
func setResult(_ result: Result<(Data, URLResponse), Error>) {
self.result = result
}
}