Add Separator tests

tests/test_widgets.py

@@ -1059,6 +1059,37 @@ def f(x: Set[Lit]): ...
     assert sel.choices == get_args(Lit)
 
 
+def test_separator_default():
+    from magicgui.types import Separator
+
+    sep = Separator()
+    assert sep.thickness == 1
+
+
+def test_separator():
+    from magicgui.types import Separator
+
+    sep = [Separator(i + 1) for i in range(4)]
+    a = [1, 2, sep[0], 4, sep[1], 6, 7, sep[2], 9, sep[3], 11, 12, sep[0], 14, sep[0]]
+    b = [1, 2, sep[0], 4, sep[1], 6, 7, sep[2], 9, sep[3], 6, 7, sep[0], 9, sep[0]]
+    a2 = (1, 2, None, 4, None, None, 6, 7, None, None, None, 9, None, None, None, None, 11, 12, None, 14, None)
+    b2 = (1, 2, None, 4, None, None, 6, 7, None, None, None, 9, None, None, None, None, None, None)
+
+    @magicgui(
+        call_button="Test Separator",
+        a={"widget_type": "ComboBox", "choices": a},
+        b={"widget_type": "ComboBox", "choices": b},
+        result_widget=True,
+    )
+    def widget_with_separator(a=a[0], b=b[0]):
+        return
+
+    assert widget_with_separator.a.native.count() == 21
+    assert widget_with_separator.b.native.count() == 18
+    assert widget_with_separator.a.choices == a2
+    assert widget_with_separator.b.choices == b2
+
+
 def test_float_slider_readout():
     sld = widgets.FloatSlider(value=4, min=0.5, max=10.5)
     assert sld.value == 4