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use test;
use lang:bs:macro; // only needed for 'named{}' in 'main'.
Int fibonacci(Int n) {
if (n == 0) {
return 0;
} else if (n < 0) {
throw NotSupported("n must not be negative");
}
Int current = 1;
Int previous = 0;
for (Int i = 1; i < n; i++) {
Int next = current + previous;
previous = current;
current = next;
}
return current;
}
test Fibonacci {
check fibonacci(0) == 0;
check fibonacci(1) == 1;
check fibonacci(2) == 1;
check fibonacci(3) == 2;
check fibonacci(-1) throws NotSupported;
}
void main() {
// Call the function directly:
{
print("-- Manual execution --");
TestResult result = Fibonacci();
print("Failed: ${result.failed}");
print(result.toS);
}
// Use the library:
{
print("-- Using the library --");
TestResult result = runTests(named{});
print("Failed: ${result.failed}");
}
}
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