#golang test subcases

ex_test.go

package ex

import (
	"fmt"
	"testing"
)

func Multiplier(in int) int {
	return in * 2
}

func makeMultiplierTest(input, wanted int) func(*testing.T) {
	return func(t *testing.T) {
		if Multiplier(input) != wanted {
			t.Errorf("Multiplier(%v) == (%v)", input, wanted)
		}
	}
}

func TestMultiplier(t *testing.T) {
	testCases := []struct {
		input int
		wanted int
	}{
		{
			input: 5,
			wanted: 10,
		},
		{
			input: 2,
			wanted: 4,
		},
		{
			input: 3,
			wanted: 7,
		},
	}
	
	for _, tc := range testCases {
		t.Run(fmt.Sprintf("Multiplier(%d)", tc.input), makeMultiplierTest(tc.input, tc.wanted))
	}
}