refactor issue indexer, add some testing and fix a bug (#6131)

* refactor issue indexer, add some testing and fix a bug

* fix error copyright year on comment header

* issues indexer package import keep consistent

modules/indexer/issues/indexer_test.go

@@ -0,0 +1,51 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package issues
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func fatalTestError(fmtStr string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, fmtStr, args...)
+	os.Exit(1)
+}
+
+func TestMain(m *testing.M) {
+	models.MainTest(m, filepath.Join("..", "..", ".."))
+}
+
+func TestSearchIssues(t *testing.T) {
+	assert.NoError(t, models.PrepareTestDatabase())
+
+	os.RemoveAll(setting.Indexer.IssueIndexerQueueDir)
+	os.RemoveAll(setting.Indexer.IssuePath)
+	if err := InitIssueIndexer(true); err != nil {
+		fatalTestError("Error InitIssueIndexer: %v\n", err)
+	}
+
+	time.Sleep(10 * time.Second)
+
+	ids, err := SearchIssuesByKeyword(1, "issue2")
+	assert.NoError(t, err)
+	assert.EqualValues(t, []int64{2}, ids)
+
+	ids, err = SearchIssuesByKeyword(1, "first")
+	assert.NoError(t, err)
+	assert.EqualValues(t, []int64{1}, ids)
+
+	ids, err = SearchIssuesByKeyword(1, "for")
+	assert.NoError(t, err)
+	assert.EqualValues(t, []int64{1, 2, 3, 5}, ids)
+}