Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/docextractor/plain_test.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package docextractor
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPlainEmptyFile(t *testing.T) {
+	extractor := plainExtractor{}
+	extractedText, err := extractor.Extract("test.txt", bytes.NewReader([]byte{}))
+	require.NoError(t, err)
+	require.Equal(t, "", extractedText)
+}
+
+func TestPlainTextSmallFile(t *testing.T) {
+	extractor := plainExtractor{}
+	content := strings.Repeat("test \n", 5)
+	extractedText, err := extractor.Extract("test.txt", bytes.NewReader([]byte(content)))
+	require.NoError(t, err)
+	require.Equal(t, content, extractedText)
+}
+
+func TestPlainBigFile(t *testing.T) {
+	extractor := plainExtractor{}
+	content := strings.Repeat("test \n", 1000)
+	extractedText, err := extractor.Extract("test.txt", bytes.NewReader([]byte(content)))
+	require.NoError(t, err)
+	require.Equal(t, content, extractedText)
+}
+
+func TestSmallBinaryFile(t *testing.T) {
+	extractor := plainExtractor{}
+	notUTF8Char := byte(0x7)
+	content := bytes.Repeat([]byte{notUTF8Char}, 1000)
+	extractedText, err := extractor.Extract("test.bin", bytes.NewReader(content))
+	require.NoError(t, err)
+	require.Equal(t, "", extractedText)
+}
+
+func TestBigBinaryFile(t *testing.T) {
+	extractor := plainExtractor{}
+	notUTF8Char := byte(0x7)
+	content := bytes.Repeat([]byte{notUTF8Char}, 10000)
+	extractedText, err := extractor.Extract("test.bin", bytes.NewReader(content))
+	require.NoError(t, err)
+	require.Equal(t, "", extractedText)
+}