Custom Assertions
Set your own expectations!
Custom assertions are possible, and the interface for reporting Actual and Expected values is exposed publicly.
For example, we can write a custom assertEven function like this:
// Custon Assertion functions are best created with messages
function assertEven<T>(
value: i32,
message: string = "actual value should be even",
): void {
// take advantage of compile time errors
if (!isInteger(value)) {
ERROR("assertEven should only be called with integers!");
}
// Tell the host the actual and expected values
Actual.report(value);
Expected.report("Even");
// check if the first bit is 0
let isEven = (value & 1) == 0;
// use assert function with message
assert(isEven, message);
// Clear the host actual and expected values afterwards
Actual.clear();
Expected.clear();
}
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