conf: add unit tests (#5954)

* conf: add tests for utils.go

* conf: add tests for static.go

* mock os/exec

* Run tests on Windows

* appveyor: fix gcc not found

* computed: add unit tests

* log: add unit tests

* log: fix tests on Windows

* conf: add some tests

* Finish adding tests

* Cover more cases

* Add tests for testutil

* Add more tests

internal/testutil/exec_test.go

@@ -0,0 +1,55 @@
+// Copyright 2020 The Gogs 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 testutil
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestExecHelper(t *testing.T) {
+	if !WantHelperProcess() {
+		return
+	}
+
+	if os.Getenv("PASS") != "1" {
+		fmt.Fprintln(os.Stdout, "tests failed")
+		os.Exit(1)
+	}
+
+	fmt.Fprintln(os.Stdout, "tests succeed")
+}
+
+func TestExec(t *testing.T) {
+	tests := []struct {
+		helper string
+		env    string
+		expOut string
+		expErr error
+	}{
+		{
+			helper: "NoTestsToRun",
+			expErr: errors.New("no tests to run"),
+		}, {
+			helper: "TestExecHelper",
+			expErr: errors.New("exit status 1 - tests failed\n"),
+		}, {
+			helper: "TestExecHelper",
+			env:    "PASS=1",
+			expOut: "tests succeed",
+		},
+	}
+	for _, test := range tests {
+		t.Run("", func(t *testing.T) {
+			out, err := Exec(test.helper, test.env)
+			assert.Equal(t, test.expErr, err)
+			assert.Equal(t, test.expOut, out)
+		})
+	}
+}