test: add test for text box

tests/unit_tests/test_text_box_widget.py

@@ -0,0 +1,43 @@
+import re
+from unittest import mock
+
+import pytest
+
+from bec_widgets.widgets.text_box.text_box import TextBox
+
+from .client_mocks import mocked_client
+
+
+@pytest.fixture
+def text_box_widget(qtbot, mocked_client):
+    widget = TextBox(client=mocked_client)
+    qtbot.addWidget(widget)
+    qtbot.waitExposed(widget)
+    yield widget
+    widget.close()
+
+
+def test_textbox_widget(text_box_widget):
+
+    text_box_widget.set_text("Hello World!")
+    # pylint: disable=protected-access
+    assert text_box_widget._text == "Hello World!"
+
+    text_box_widget.set_color("#FFDDC1", "#123456")
+    text_box_widget.set_font_size(20)
+    assert (
+        text_box_widget.styleSheet() == "background-color: #FFDDC1; color: #123456; font-size: 20px"
+    )
+
+    with mock.patch.object(text_box_widget, "setHtml") as mock_set_plain_text:
+        text_box_widget.set_text(
+            "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
+        )
+        assert mock_set_plain_text.call_args == mock.call(
+            "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
+        )
+        # pylint: disable=protected-access
+        assert (
+            text_box_widget._text
+            == "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
+        )