The tests in variadic_test.go elaborated on the rules for the variadic function. However, you might have noticed that TestSimpleVariadicToSlice ran three tests in its function body, but go test treats it as a single test. Go provides a good way to run multiple tests within a single function, and we shall look them in addInt_test.go.

For this example, we will use a very simple function as shown in this code:

// addInt.go 
 
package main 
 
func addInt(numbers ...int) int { 
    sum := 0 
    for _, num := range numbers { 
        sum += num 
    } 
    return sum 
}