From a1f26b11bd9b3c24a399da565ce95191fbc10759 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9ra=20Zolt=C3=A1n?= <serazoli@gmail.com>
Date: Fri, 15 Jan 2021 15:18:17 +0200
Subject: [PATCH] Add test for cannot write hidden file without extension

---
 viper_test.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/viper_test.go b/viper_test.go
index 080d0c41a..c371c070e 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -1742,6 +1742,23 @@ func TestSafeWriteConfigAsWithExistingFile(t *testing.T) {
 	assert.True(t, ok, "Expected ConfigFileAlreadyExistsError")
 }
 
+func TestWriteHiddenFile(t *testing.T) {
+	v := New()
+	fs := afero.NewMemMapFs()
+	fs.Create("/test/.config")
+	v.SetFs(fs)
+
+	v.SetConfigName(".config")
+	v.SetConfigType("yaml")
+	v.AddConfigPath("/test")
+
+	err := v.ReadInConfig()
+	require.NoError(t, err)
+
+	err = v.WriteConfig()
+	require.NoError(t, err)
+}
+
 var yamlMergeExampleTgt = []byte(`
 hello:
     pop: 37890