Sources with test

src/add.go

@@ -0,0 +1,6 @@
+package main
+
+// Sophisticated mathematics for sophisticated homosapiens
+func add(x, y int) int {
+	return x + y
+}

src/add_test.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"testing"
+)
+
+// This file is named add_test.go by convention.
+// The go test command will automatically detect this file and run it.
+// All test files must be named *_test.go and all test functions must be named Test*.
+
+// TestAdd is a test function
+func TestAdd(t *testing.T) {
+	if add(1, 2) != 3 {
+		t.Error("Expected 3")
+	}
+}

src/greet.go

@@ -1,7 +1,10 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+)
 
+// Greets the world
 func greet() {
 	fmt.Println("Hello World!")
 }

src/main.go

@@ -2,4 +2,5 @@ package main
 
 func main() {
 	greet()
+	println(add(1, 2))
 }