test setup

fizzbuzz.go

@@ -9,3 +9,7 @@ func FizzBuzz() {
 		fmt.Println(out)
 	}
 }
+
+func fizzOrBuzz(number int) string {
+	return ""
+}

fizzbuzz_test.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestFizzBuzz(t *testing.T) {
+	t.Run("number", func(t *testing.T) {
+		out := fizzOrBuzz(1)
+		assert.Equal(t, "1", out)
+	})
+}

go.mod

@@ -1,3 +1,10 @@
 module golang-intro
 
 go 1.17
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.8.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)