Using XCTest, how can one chain together multiple discrete sequences of { expectations -> wait }?

I do the following and it works.

expectation = [self expectationWithDescription:@"Testing Async Method Works!"];

[AsynClass method:parameter callbackFunction:^(BOOL callbackStatus, NSMutableArray* array) {
    [expectation fulfil];
    // whatever
}];

[self waitForExpectationsWithTimeout:5 handler:^(NSError *error) {
    if (error) {
        XCTFail(@"Expectation Failed with error: %@", error);
    }
    NSLog(@"expectation wait until handler finished ");
}];

// do it again

expectation = [self expectationWithDescription:@"Testing Async Method Works!"];

[CallBackClass method:parameter callbackFunction:^(BOOL callbackStatus, NSMutableArray* array) {
    [expectation fulfil];
    // whatever
}];

[self waitForExpectationsWithTimeout:5 handler:^(NSError *error) {
    if (error) {
        XCTFail(@"Expectation Failed with error: %@", error);
    }
    NSLog(@"expectation wait until handler finished ");
}];

swift

let expectation1 = //your definition
let expectation2 = //your definition

let result = XCTWaiter().wait(for: [expectation1, expectation2], timeout: 10, enforceOrder: true)

if result == .completed {
    //all expectations completed in order
} 

Assigning my expectation to a weak variable worked for me.