test: add TestHelp function to validate Help() output

Author: fabianoflorentino

internal/canais/help_test.go

@@ -0,0 +1,27 @@
+package canais
+
+import (
+	"os"
+	"testing"
+)
+
+func TestHelp(t *testing.T) {
+	var err error
+
+	oldStdout := os.Stdout
+	defer func() { os.Stdout = oldStdout }()
+
+	nullFile, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0)
+	if err != nil {
+		t.Fatalf("failed to open null device: %v", err)
+	}
+	defer nullFile.Close()
+
+	os.Stdout = nullFile
+
+	Help()
+
+	if err != nil {
+		t.Errorf("Help() failed: %v", err)
+	}
+}