Initial import

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diff --git a/lulua/test_layout.py b/lulua/test_layout.py
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+# Copyright (c) 2019 lulua contributors
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import unicodedata
+from itertools import product
+
+import pytest
+
+from .layout import defaultLayouts, GenericLayout, ButtonCombination
+from .keyboard import defaultKeyboards
+
+@pytest.mark.parametrize("layout", defaultLayouts, ids=[l.name for l in defaultLayouts])
+def test_atomic (layout):
+    """ Make sure layout text strings are atomic (i.e. not decomposeable) """
+    for _, text in layout.buttons ():
+        assert isinstance (text, str)
+        for char in text:
+            d = unicodedata.decomposition (char)
+            # allow compat decompositions like … -> ...
+            if not d.startswith ('<compat> ') and not d.startswith ('<isolated> ') and not d.startswith ('<medial> ') and not d.startswith ('<initial> '):
+                assert d == '', char
+
+@pytest.mark.parametrize("layout", defaultLayouts, ids=[l.name for l in defaultLayouts])
+def test_genericlayout_len (layout):
+    assert len (layout) == len (list (layout.buttons ()))
+
+@pytest.mark.parametrize("layout", defaultLayouts, ids=[l.name for l in defaultLayouts])
+def test_layout_serialize (layout):
+    assert GenericLayout.deserialize (layout.serialize ()) == layout
+
+@pytest.mark.parametrize("a, b", product (defaultLayouts, defaultLayouts))
+def test_layout_equality (a, b):
+    if a.name == b.name:
+        # this is true for our default layouts only
+        assert a == b
+    else:
+        assert a != b
+
+def test_layout_isModifier ():
+    keyboard = defaultKeyboards['ibmpc105']
+    layout = defaultLayouts['ar-linux'].specialize (keyboard)
+    assert layout.isModifier (frozenset ([keyboard['El_shift']]))
+    assert layout.isModifier (frozenset ([keyboard['Er_shift']]))
+    assert not layout.isModifier (frozenset ([keyboard['Dr1']]))
+
+def test_buttoncomb_eq ():
+    a = ButtonCombination (frozenset (['a']), frozenset (['b']))
+    b = ButtonCombination (frozenset (['a']), frozenset (['b']))
+    c = ButtonCombination (frozenset (['a']), frozenset (['c']))
+
+    assert a == b
+    assert a != c and b != c
+
+    d = dict ()
+    d[a] = 'a'
+    assert b in d
+    assert c not in d
+