Add the ability to fully customize jet generated files.

tests/internal/utils/file/file.go

@@ -0,0 +1,25 @@
+package file
+
+import (
+	"github.com/stretchr/testify/require"
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+)
+
+// Exists expects file to exist on path constructed from pathElems and returns content of the file
+func Exists(t *testing.T, pathElems ...string) (fileContent string) {
+	modelFilePath := path.Join(pathElems...)
+	file, err := ioutil.ReadFile(modelFilePath)
+	require.Nil(t, err)
+	require.NotEmpty(t, file)
+	return string(file)
+}
+
+// NotExists expects file not to exist on path constructed from pathElems
+func NotExists(t *testing.T, pathElems ...string) {
+	modelFilePath := path.Join(pathElems...)
+	_, err := ioutil.ReadFile(modelFilePath)
+	require.True(t, os.IsNotExist(err))
+}