Invoke an XCTest multiple times by overriding XCTestCase's `invokeTest()` function

invokeTest.swift

// In any XCTestCase subclass:
override func invokeTest() {
    let maxInvocations = 100
    (1...maxInvocations).forEach {
        print("Test invocation: #\($0)/\(maxInvocations)")
        super.invokeTest()
    }
}

// In Objective-C:
- (void)invokeTest
{
    for (int i=0; i<100; i++) {
        [super invokeTest];
    }
}