From 1944d8534b6048666bb73fa3142c666acddb098d Mon Sep 17 00:00:00 2001
From: Anton Kaliaev <anton.kalyaev@gmail.com>
Date: Tue, 6 Nov 2018 15:54:04 +0100
Subject: [PATCH] test AutoFile#Size (happy path)

---
 libs/autofile/autofile_test.go | 37 ++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/libs/autofile/autofile_test.go b/libs/autofile/autofile_test.go
index 5408d820..0b3521c2 100644
--- a/libs/autofile/autofile_test.go
+++ b/libs/autofile/autofile_test.go
@@ -84,3 +84,40 @@ func TestOpenAutoFilePerms(t *testing.T) {
 		t.Errorf("unexpected error %v", e)
 	}
 }
+
+func TestAutoFileSize(t *testing.T) {
+	// First, create an AutoFile writing to a tempfile dir
+	f, err := ioutil.TempFile("", "sighup_test")
+	require.NoError(t, err)
+	err = f.Close()
+	require.NoError(t, err)
+
+	// Here is the actual AutoFile.
+	af, err := OpenAutoFile(f.Name())
+	require.NoError(t, err)
+
+	// 1. Empty file
+	size, err := af.Size()
+	require.Zero(t, size)
+	require.NoError(t, err)
+
+	// 2. Not empty file
+	data := []byte("Maniac\n")
+	_, err = af.Write(data)
+	require.NoError(t, err)
+	size, err = af.Size()
+	require.EqualValues(t, len(data), size)
+	require.NoError(t, err)
+
+	// 3. Not existing file
+	err = af.Close()
+	require.NoError(t, err)
+	err = os.Remove(f.Name())
+	require.NoError(t, err)
+	size, err = af.Size()
+	require.EqualValues(t, 0, size, "Expected a new file to be empty")
+	require.NoError(t, err)
+
+	// Cleanup
+	_ = os.Remove(f.Name())
+}