add config

config/source/file/file_test.go

@@ -0,0 +1,37 @@
+package file
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestFile(t *testing.T) {
+	data := []byte(`{"foo": "bar"}`)
+	path := filepath.Join(os.TempDir(), fmt.Sprintf("file.%d", time.Now().UnixNano()))
+	fh, err := os.Create(path)
+	if err != nil {
+		t.Error(err)
+	}
+	defer func() {
+		fh.Close()
+		os.Remove(path)
+	}()
+
+	_, err = fh.Write(data)
+	if err != nil {
+		t.Error(err)
+	}
+
+	f := NewSource(WithPath(path))
+	c, err := f.Read()
+	if err != nil {
+		t.Error(err)
+	}
+	t.Logf("%+v", c)
+	if string(c.Data) != string(data) {
+		t.Error("data from file does not match")
+	}
+}