What is XCTAssert in unit testing?
XCTAssert is one of a family of asserts for unit testing from the XCTest framework, and should only be present in Unit Test Targets (i.e. not in your application code). If the assert fails, it does not terminate the execution of the test harness or hosting application, but records and reports the failure.
What is XCTUnwrap?
XCTUnwrap is a public XCTest helper that often gets overlooked. It was added in Xcode 11 and slipped under my radar until recently. As you might have guessed, the helper unwraps optional values. It’s kind of like force unwrapping, but made specifically for your test suite.
What is testable import?
When we add @testable attribute to an import statement for module complied with testing enabled, we activate elevated access for that module in that scope. Classes and class members marked as public behave as if they were marked open. Other entities marked as internal act as if they were declared public.
What is XCTest in iOS?
XCTest framework is one of those frameworks that enables its users to write basic unit, performance and some level of UI tests for iOS apps. And as always, frameworks that couple tightly with their development tool and the environment has some pros and cons that users should be aware of.
What is assert in Swift?
Swift lets you force an app crash using the assert() function. This takes two parameters: a condition to check, and a message to print if the assertion fails.
What is precondition in Swift?
Check a necessary condition for making forward progress. Use this function to detect conditions that must prevent the program from proceeding even in shipping code.
What is swift testing?
Testing Swift will give you a thorough grounding in the key testing techniques when working in app development. You’ll learn how to benchmark performance, detect regressions, mock components, refactor for testability, and more.
What is test case in Swift?
Test cases have two methods you override to set your tests up and to tear your tests down when they are finished running. We will go over that in more detail later, but the basic idea is to create a nice clean slate before you run every test. No unit test should ever depend on state created from a previous unit test.
What is XCTest framework?
XCTest is the base framework for UI testing, allowing you to create unit tests. You first create a UI test target in Xcode, then you create UI test classes and methods that will form part of your UI testing methodology.
What is XCTest file?
xctest file is the file when you use XCtest framework to write a unit test case for your project. projectNameTests. m – Unit test case which will have your unit test which you will be writing for your business logic.
What assert does in C?
expression − This can be a variable or any C expression. If expression evaluates to TRUE, assert() does nothing. If expression evaluates to FALSE, assert() displays an error message on stderr (standard error stream to display error messages and diagnostics) and aborts program execution.
What is assert in IOS?
As you can see assert() takes two parameters: something to check, and a message to print out of the check fails. If the check evaluates to false, your app will be forced to crash because you know it’s not in a safe state, and you’ll see the error message in the debug console. You can – and should!