Add test covering wiki switching

pkg/testutils/testutils.go

@@ -1,17 +1,27 @@
 package testutils
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
 	"os/exec"
 	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 type TestState struct {
 	WikicmdBinaryPath string
 	WikicmdConfigPath string
 }
 
+type ConfigField int
+
+const (
+	Config_field_default ConfigField = iota
+)
+
 func RunWikiCmd(state *TestState, command string) (string, error) {
 	commandParameters := toCommandParameters(command)
 
@@ -27,10 +37,56 @@ func RunWikiCmd(state *TestState, command string) (string, error) {
 }
 
 func StartupTest() *TestState {
+	configFilePath, err := mktemp()
+	if err != nil {
+		panic(err)
+	}
+
+	configContent, err := os.ReadFile(fmt.Sprintf("%s/tests/e2e/wikicmd_config.json", pwd()))
+	if err != nil {
+		panic(err)
+	}
+
+	os.WriteFile(configFilePath, configContent, 0644)
+
 	return &TestState{
 		fmt.Sprintf("%s/bin/wikicmd", pwd()),
-		fmt.Sprintf("%s/tests/e2e/wikicmd_config.json", pwd()),
+		configFilePath,
+	}
+}
+
+func AssertConfig(t *testing.T, state *TestState, field ConfigField, expectedValue string) {
+	var jsonParsed map[string]interface{}
+
+	configContent, err := os.ReadFile(state.WikicmdConfigPath)
+	if err != nil {
+		panic(err)
+	}
+
+	err = json.Unmarshal(configContent, &jsonParsed)
+	if err != nil {
+		panic(err)
+	}
+
+	value := ""
+	if field == Config_field_default {
+		value = jsonParsed["default"].(string)
+	}
+
+	assert.Equal(
+		t,
+		value,
+		expectedValue,
+	)
+}
+
+func mktemp() (string, error) {
+	result, err := exec.Command("mktemp").Output()
+	if err != nil {
+		return "", err
 	}
+
+	return string(result), nil
 }
 
 func pwd() string {

tests/e2e/cmd_switch_test.go

@@ -20,3 +20,17 @@ The available Wikis you can switch to are: my_wiki,another_wiki
 `,
 	)
 }
+
+func TestSwitchingToAnotherWiki(t *testing.T) {
+	testState := testutils.StartupTest()
+	commandResult, _ := testutils.RunWikiCmd(testState, "switch another_wiki")
+
+	assert.Equal(
+		t,
+		commandResult,
+		`Done!
+`,
+	)
+
+	testutils.AssertConfig(t, testState, testutils.Config_field_default, "another_wiki")
+}