1 files changed, 53 insertions, 0 deletions
diff --git a/tests/test_layout.py b/tests/test_layout.py
new file mode 100644
index 0000000..cbbbcd0
--- /dev/null
+++ b/tests/test_layout.py
@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+import pytest
+
+from prompt_toolkit.layout import InvalidLayoutError, Layout
+from prompt_toolkit.layout.containers import HSplit, VSplit, Window
+from prompt_toolkit.layout.controls import BufferControl
+
+
+def test_layout_class():
+    c1 = BufferControl()
+    c2 = BufferControl()
+    c3 = BufferControl()
+    win1 = Window(content=c1)
+    win2 = Window(content=c2)
+    win3 = Window(content=c3)
+
+    layout = Layout(container=VSplit([HSplit([win1, win2]), win3]))
+
+    # Listing of windows/controls.
+    assert list(layout.find_all_windows()) == [win1, win2, win3]
+    assert list(layout.find_all_controls()) == [c1, c2, c3]
+
+    # Focusing something.
+    layout.focus(c1)
+    assert layout.has_focus(c1)
+    assert layout.has_focus(win1)
+    assert layout.current_control == c1
+    assert layout.previous_control == c1
+
+    layout.focus(c2)
+    assert layout.has_focus(c2)
+    assert layout.has_focus(win2)
+    assert layout.current_control == c2
+    assert layout.previous_control == c1
+
+    layout.focus(win3)
+    assert layout.has_focus(c3)
+    assert layout.has_focus(win3)
+    assert layout.current_control == c3
+    assert layout.previous_control == c2
+
+    # Pop focus. This should focus the previous control again.
+    layout.focus_last()
+    assert layout.has_focus(c2)
+    assert layout.has_focus(win2)
+    assert layout.current_control == c2
+    assert layout.previous_control == c1
+
+
+def test_create_invalid_layout():
+    with pytest.raises(InvalidLayoutError):
+        Layout(HSplit([]))