Implemented error messages

src/build/Build_test.go

@@ -1,6 +1,7 @@
 package build_test
 
 import (
+	"path/filepath"
 	"testing"
 
 	"git.akyoto.dev/cli/q/src/build"
@@ -9,16 +10,17 @@ import (
 
 func TestBuild(t *testing.T) {
 	b := build.New("../../examples/hello")
-	assert.Nil(t, b.Run())
+	_, err := b.Run()
+	assert.Nil(t, err)
 }
 
-func TestSkipExecutable(t *testing.T) {
+func TestExecutable(t *testing.T) {
 	b := build.New("../../examples/hello")
-	b.WriteExecutable = false
-	assert.Nil(t, b.Run())
+	assert.Equal(t, filepath.Base(b.Executable()), "hello")
 }
 
 func TestNonExisting(t *testing.T) {
 	b := build.New("does-not-exist")
-	assert.NotNil(t, b.Run())
+	_, err := b.Run()
+	assert.NotNil(t, err)
 }