XCTest performance testing of POST API - ios

Question

I am implementing Unit Test for my iOS swift project. I want to implement performance test for the POST API which I had in my project, but I don't know how to implement that POST API. I have tested GET APIs and that give me desired results.
Here's the code what I am trying to implement
func testPerfromancePOSTAPI() {
let session = URLSession.shared
var request = URLRequest(url: MY_URL)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
do {
request.httpBody = try JSONSerialization.data(withJSONObject: MY_SERVICE_PARA, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
}
self.measure {
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print("response JSON = \(json)")
}
} catch let error {
XCTFail("Expectation Failed with error: %#", file: error as! StaticString);
}
})
task.resume()
}
}
When I run this test it passes successfully but doesn't print the response JSON and neither gives an error and shows that "Time 0.0000 sec (161% STDEV)", while running the same API in postman it takes few sec.
Please check and help me out this.

Answer 1

Try changing ur code as follows
func testPerfromancePOSTAPI() {
let session = URLSession.shared
var request = URLRequest(url: MY_URL)
let expectations = expectation(description: "POST")
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
do {
request.httpBody = try JSONSerialization.data(withJSONObject: MY_SERVICE_PARA, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
}
self.measure {
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print("response JSON = \(json)") expectations.fulfill()
}
} catch let error {
XCTFail("Expectation Failed with error: %#", file: error as! StaticString);
}
})
task.resume()
self.waitForExpectations(timeout: 10) { (error) in
if let error = error {
XCTFail("Error: \(error.localizedDescription)")
}
}
}
}
Change the timeout value to a higher one, if u still not getting any responses.

Answer 2

Defining expectation inside the measure block will works to measure performance.
func testPostAPIFetchParseTime() {
let session = URLSession.shared
var request = URLRequest(url: MY_URL)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
do {
request.httpBody = try JSONSerialization.data(withJSONObject: MY_SERVICE_PARA, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
}
self.measure {
let expectations = self.expectation(description: "POST API performance check")
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print("response JSON = \(json)")
expectations.fulfill()
}
} catch let error {
XCTFail("Expectation Failed with error: %#", file: error as! StaticString);
}
})
task.resume()
self.waitForExpectations(timeout: 10.0) { (error) in
if let error = error {
XCTFail("Error: \(error.localizedDescription)")
}
}
}
}