Add unit tests for Client TLS, Username, and Password methods

Introduced unit tests for Client's SetTLSConfig, SetUsername, and SetPassword methods. The tests cover various scenarios, including setting valid configurations, handling nil inputs, and overriding previous settings. This improves our test coverage and ensures the reliability of these methods.

client_test.go

@@ -1199,6 +1199,96 @@ func TestClient_SetDebugLog(t *testing.T) {
 	})
 }
 
+func TestClient_SetTLSConfig(t *testing.T) {
+	t.Run("SetTLSConfig with &tls.Config", func(t *testing.T) {
+		client, err := NewClient(DefaultHost)
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		if err = client.SetTLSConfig(&tls.Config{}); err != nil {
+			t.Errorf("failed to set expected TLSConfig: %s", err)
+		}
+		if client.tlsconfig == nil {
+			t.Fatalf("failed to set expected TLSConfig. TLSConfig is nil")
+		}
+	})
+	t.Run("SetTLSConfig with InsecureSkipVerify", func(t *testing.T) {
+		client, err := NewClient(DefaultHost)
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		if err = client.SetTLSConfig(&tls.Config{InsecureSkipVerify: true}); err != nil {
+			t.Errorf("failed to set expected TLSConfig: %s", err)
+		}
+		if client.tlsconfig == nil {
+			t.Fatalf("failed to set expected TLSConfig. TLSConfig is nil")
+		}
+		if !client.tlsconfig.InsecureSkipVerify {
+			t.Errorf("failed to set expected TLSConfig. Expected InsecureSkipVerify: %t, got: %t", true,
+				client.tlsconfig.InsecureSkipVerify)
+		}
+	})
+	t.Run("SetTLSConfig with nil should fail", func(t *testing.T) {
+		client, err := NewClient(DefaultHost)
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		err = client.SetTLSConfig(nil)
+		if err == nil {
+			t.Errorf("SetTLSConfig with nil should fail")
+		}
+		if !errors.Is(err, ErrInvalidTLSConfig) {
+			t.Errorf("SetTLSConfig was expected to fail with %s, got: %s", ErrInvalidTLSConfig, err)
+		}
+	})
+}
+
+func TestClient_SetUsername(t *testing.T) {
+	t.Run("SetUsername", func(t *testing.T) {
+		client, err := NewClient(DefaultHost)
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		client.SetUsername("toni.tester")
+		if client.user != "toni.tester" {
+			t.Errorf("failed to set expected username, want: %s, got: %s", "toni.tester", client.user)
+		}
+	})
+	t.Run("SetUsername to override WithUsername", func(t *testing.T) {
+		client, err := NewClient(DefaultHost, WithUsername("toni.tester"))
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		client.SetUsername("tina.tester")
+		if client.user != "tina.tester" {
+			t.Errorf("failed to set expected username, want: %s, got: %s", "tina.tester", client.user)
+		}
+	})
+}
+
+func TestClient_SetPassword(t *testing.T) {
+	t.Run("SetPassword", func(t *testing.T) {
+		client, err := NewClient(DefaultHost)
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		client.SetPassword("sU*perS3crEt")
+		if client.pass != "sU*perS3crEt" {
+			t.Errorf("failed to set expected password, want: %s, got: %s", "sU*perS3crEt", client.pass)
+		}
+	})
+	t.Run("SetPassword to override WithPassword", func(t *testing.T) {
+		client, err := NewClient(DefaultHost, WithPassword("sU*perS3crEt"))
+		if err != nil {
+			t.Fatalf("failed to create new client: %s", err)
+		}
+		client.SetPassword("Su%perS3crEt")
+		if client.pass != "Su%perS3crEt" {
+			t.Errorf("failed to set expected password, want: %s, got: %s", "Su%perS3crEt", client.pass)
+		}
+	})
+}
+
 /*