diff --git a/tests/unit_tests/test_main_widnow.py b/tests/unit_tests/test_main_widnow.py
new file mode 100644
index 00000000..482466f0
--- /dev/null
+++ b/tests/unit_tests/test_main_widnow.py
@@ -0,0 +1,135 @@
+import webbrowser
+
+import pytest
+from qtpy.QtWidgets import QFrame
+
+from bec_widgets.widgets.containers.main_window.addons.scroll_label import ScrollLabel
+from bec_widgets.widgets.containers.main_window.addons.web_links import BECWebLinksMixin
+from bec_widgets.widgets.containers.main_window.main_window import BECMainWindow
+
+from .client_mocks import mocked_client
+from .conftest import create_widget
+
+
+@pytest.fixture
+def bec_main_window(qtbot, mocked_client):
+    widget = BECMainWindow(client=mocked_client)
+    qtbot.addWidget(widget)
+    qtbot.waitExposed(widget)
+    yield widget
+
+
+#################################################################
+# Tests for BECMainWindow Initialization and Functionality
+#################################################################
+
+
+def test_bec_main_window_initialization(bec_main_window):
+    assert isinstance(bec_main_window, BECMainWindow)
+    assert bec_main_window.windowTitle() == "BEC"
+    assert bec_main_window.app is not None
+    assert bec_main_window.statusBar() is not None
+    assert bec_main_window._app_id_label is not None
+
+
+def test_bec_main_window_display_client_message(qtbot, bec_main_window):
+    """
+    Verify that display_client_message updates the client‑info label.
+    """
+    test_msg = "Client connected successfully"
+    bec_main_window.display_client_message({"message": test_msg}, {})
+    qtbot.wait(200)
+    assert bec_main_window._client_info_label.text() == test_msg
+
+
+def test_status_bar_has_separator(bec_main_window):
+    """Ensure the status bar contains at least one vertical separator."""
+    status_bar = bec_main_window.statusBar()
+    separators = [w for w in status_bar.findChildren(QFrame) if w.frameShape() == QFrame.VLine]
+    assert separators, "Expected at least one QFrame separator in the status bar."
+
+
+#################################################################
+# Tests for BECMainWindow Addons
+#################################################################
+
+#################################################################
+# Tests for ScrollLabel behaviour
+
+
+def test_scroll_label_does_not_scroll_when_text_fits(qtbot):
+    """Label with short text should not activate scrolling timer."""
+    lbl = create_widget(qtbot, ScrollLabel)  # shorten delay for test speed
+    qtbot.addWidget(lbl)
+    lbl.resize(200, 20)
+    lbl.setText("Short text")
+    # Process events to allow timer logic to run
+    qtbot.wait(200)
+    assert not lbl._timer.isActive()
+    assert not lbl._delay_timer.isActive()
+
+
+def test_scroll_label_starts_scrolling(qtbot):
+    """Label with long text should start _delay_timer; later _timer becomes active."""
+    lbl = create_widget(qtbot, ScrollLabel, delay_ms=100)
+    lbl.resize(150, 20)
+    long_text = "This is a very long piece of text that should definitely overflow the label width"
+    lbl.setText(long_text)
+    # Immediately after setText, only delay‑timer should be active
+    assert lbl._delay_timer.isActive()
+    assert not lbl._timer.isActive()
+    # Wait until scrolling timer becomes active
+    qtbot.waitUntil(lambda: lbl._timer.isActive(), timeout=2000)
+    assert lbl._timer.isActive()
+
+
+def test_scroll_label_scroll_method(qtbot):
+    """Directly exercise _scroll to ensure offset advances and paintEvent is invoked."""
+    lbl = create_widget(qtbot, ScrollLabel, step_px=5)  # shorten delay for test speed
+    qtbot.addWidget(lbl)
+    lbl.resize(120, 20)
+    lbl.setText("x" * 200)  # long text to guarantee overflow
+    qtbot.wait(200)  # let timers configure themselves
+
+    # Capture current offset and force a manual scroll tick
+    old_offset = lbl._offset
+    lbl._scroll()
+    assert lbl._offset == old_offset + 5
+
+
+def test_scroll_label_paint_event(qtbot):
+    """
+    Grab the widget as a pixmap; this calls paintEvent under the hood
+    and ensures no exceptions occur during rendering.
+    """
+    lbl = create_widget(qtbot, ScrollLabel)  # shorten delay for test speed
+    qtbot.addWidget(lbl)
+    lbl.resize(180, 20)
+    lbl.setText("Rendering check")
+    lbl.show()
+    qtbot.wait(200)  # allow Qt to schedule a paint
+    pixmap = lbl.grab()
+    assert not pixmap.isNull()
+
+
+#################################################################
+# Tests for BECWebLinksMixin (webbrowser opening)
+
+
+def test_bec_weblinks(monkeypatch):
+    opened_urls = []
+
+    def fake_open(url):
+        opened_urls.append(url)
+
+    monkeypatch.setattr(webbrowser, "open", fake_open)
+
+    BECWebLinksMixin.open_bec_docs()
+    BECWebLinksMixin.open_bec_widgets_docs()
+    BECWebLinksMixin.open_bec_bug_report()
+
+    assert opened_urls == [
+        "https://beamline-experiment-control.readthedocs.io/en/latest/",
+        "https://bec.readthedocs.io/projects/bec-widgets/en/latest/",
+        "https://gitlab.psi.ch/groups/bec/-/issues/",
+    ]