diff --git a/models/convert.go b/models/convert.go
index baa63bb388..1deb7c66fb 100644
--- a/models/convert.go
+++ b/models/convert.go
@@ -8,10 +8,16 @@ import (
 	"fmt"
 
 	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm/schemas"
 )
 
 // ConvertUtf8ToUtf8mb4 converts database and tables from utf8 to utf8mb4 if it's mysql and set ROW_FORMAT=dynamic
 func ConvertUtf8ToUtf8mb4() error {
+	if x.Dialect().URI().DBType != schemas.MYSQL {
+		return nil
+	}
+
 	_, err := x.Exec(fmt.Sprintf("ALTER DATABASE `%s` CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci", setting.Database.Name))
 	if err != nil {
 		return err
diff --git a/routers/install/routes_test.go b/routers/install/routes_test.go
new file mode 100644
index 0000000000..35a66c1c47
--- /dev/null
+++ b/routers/install/routes_test.go
@@ -0,0 +1,20 @@
+// Copyright 2021 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 install
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRoutes(t *testing.T) {
+	routes := Routes()
+	assert.NotNil(t, routes)
+	assert.Len(t, routes.R.Routes(), 1)
+	assert.EqualValues(t, "/", routes.R.Routes()[0].Pattern)
+	assert.Nil(t, routes.R.Routes()[0].SubRoutes)
+	assert.Len(t, routes.R.Routes()[0].Handlers, 2)
+}
diff --git a/routers/utils/utils_test.go b/routers/utils/utils_test.go
index 78ab3d20ee..bca5263311 100644
--- a/routers/utils/utils_test.go
+++ b/routers/utils/utils_test.go
@@ -62,7 +62,41 @@ func TestIsExternalURL(t *testing.T) {
 			"//try.gitea.io/test?param=false"),
 		newTest(false,
 			"/hey/hey/hey#3244"),
+		newTest(true,
+			"://missing protocol scheme"),
 	} {
 		assert.Equal(t, test.Expected, IsExternalURL(test.RawURL))
 	}
 }
+
+func TestSanitizeFlashErrorString(t *testing.T) {
+	tests := []struct {
+		name string
+		arg  string
+		want string
+	}{
+		{
+			name: "no error",
+			arg:  "",
+			want: "",
+		},
+		{
+			name: "normal error",
+			arg:  "can not open file: \"abc.exe\"",
+			want: "can not open file: "abc.exe"",
+		},
+		{
+			name: "line break error",
+			arg:  "some error:\n\nawesome!",
+			want: "some error:<br><br>awesome!",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := SanitizeFlashErrorString(tt.arg); got != tt.want {
+				t.Errorf("SanitizeFlashErrorString() = '%v', want '%v'", got, tt.want)
+			}
+		})
+	}
+}