Start unit testing (#6)

Add unit tests for identifier splitting along with instructions on how to run tests.

.gitignore

@@ -269,4 +269,9 @@ ModelManifest.xml
 /dist/
 
 # Python egg metadata, regenerated from source files by setuptools.
-/*.egg-info
+/*.egg-info
+.eggs/
+
+# Files generated by Coverage.py.
+.coverage
+htmlcov/

README.md

@@ -28,6 +28,24 @@ Code-related Utilities
 * `dpu_utils.codeutils.split_identifier_into_parts` split identifiers into subtokens on CamelCase and snake_case.
 * `dpu_utils.codeutils.{Lattice, CSharpLattice}` represent lattices and some useful operations in Python.
 
+## Tests
+
+### Run the unit tests
+
+```bash
+python setup.py test
+```
+
+### Generate code coverage reports
+
+```bash
+# pip install coverage
+coverage run --source dpu_utils/ setup.py test && \
+  coverage html
+```
+
+The resulting HTML file will be in `htmlcov/index.html`.
+
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a

setup.py

@@ -11,4 +11,5 @@ setuptools.setup(
       install_requires=[
           'azure-storage', 'numpy'
       ],
+      test_suite="tests",
       zip_safe=False)

tests/codeutils/test_identifiersplitting.py

@@ -0,0 +1,31 @@
+import unittest
+import dpu_utils.codeutils.identifiersplitting as split
+
+class TestSplitCamelCase(unittest.TestCase):
+    def run_test(self, identifier, expected):
+        actual = split.split_camelcase(identifier)
+        self.assertEqual(expected, actual)
+
+    def test_empty_string_returns_empty_list(self):
+        self.run_test("", [])
+
+    def test_single_word_is_not_split(self):
+        self.run_test("variable", ["variable"])
+
+    def test_two_words_are_split(self):
+        self.run_test("camelCase", ["camel", "Case"])
+
+    def test_three_words_are_split(self):
+        self.run_test("camelCaseIdentifier", ["camel", "Case", "Identifier"])
+
+    def test_upper_camelcase_is_split(self):
+        self.run_test("CamelCase", ["Camel", "Case"])
+
+    def test_abbreviations_are_split_correctly(self):
+        self.run_test("HTMLParser", ["HTML", "Parser"])
+
+    def test_digits_are_split(self):
+        self.run_test("var12var3", ["var", "12", "var", "3"])
+
+    def test_special_characters_are_split(self):
+        self.run_test("@var-$var", ["@", "var", "-$", "var"])