First steps of ConceptLexer. Need to update DefaultParser before continuing

tests/test_utils.py

@@ -51,8 +51,28 @@ def test_i_can_get_sub_classes():
     default_parser = core.utils.get_class("parsers.DefaultParser.DefaultParser")
     exact_concept_parser = core.utils.get_class("parsers.ExactConceptParser.ExactConceptParser")
     python_parser = core.utils.get_class("parsers.PythonParser.PythonParser")
+    concept_lexer_parser = core.utils.get_class("parsers.ConceptLexerParser.ConceptLexerParser")
 
     assert base_parser not in sub_classes
     assert default_parser in sub_classes
     assert exact_concept_parser in sub_classes
     assert python_parser in sub_classes
+    assert concept_lexer_parser in sub_classes
+
+
+@pytest.mark.parametrize("a,b, expected", [
+    ([], [], []),
+    ([], ['a'], ['a']),
+    ([[]], ['a'], [['a']]),
+    (['a'], [], ['a']),
+    ([['a']], [], [['a']]),
+
+    ([['a']], ['b'], [['a', 'b']]),
+    ([['a'], ['b']], ['c'], [['a', 'c'], ['b', 'c']]),
+    ([['a1', 'a2'], ['b1', 'b2', 'b3']], ['c'], [['a1', 'a2', 'c'], ['b1', 'b2', 'b3', 'c']]),
+    ([[]], ['a', 'b'], [['a'], ['b']]),
+    ([['a'], ['b']], ['c', 'd', 'e'], [['a', 'c'], ['b', 'c'], ['a', 'd'], ['b', 'd'], ['a', 'e'], ['b', 'e']]),
+])
+def test_i_can_product(a, b, expected):
+    res = core.utils.product(a, b)
+    assert res == expected