Increase coverage a bit

tests/test_didier/test_exceptions/test_no_match.py

@@ -0,0 +1,15 @@
+import pytest
+
+from didier.exceptions import NoMatch, expect
+
+
+def test_expect_none_raises():
+    """Test that expect() raises an error if the input entity is None"""
+    with pytest.raises(NoMatch):
+        expect(None, entity_type="", argument="")
+
+
+def test_expect_not_none_returns():
+    """Test that expect() returns the argument if it isn't None"""
+    arg = "Some input string"
+    assert expect(arg, entity_type="", argument="") == arg