Wrote some unit tests and enabled Travis-CI. (GH-37)

.travis.yml

@@ -0,0 +1,13 @@
+language: python
+cache: pip
+python:
+  - 3.6
+  - 3.6-dev
+  - 3.7-dev
+  - nightly
+
+install:
+  - python3 -m pip install -U -r dev-requirements.txt
+script:
+  - python3 -m pytest tests/
+

dev-requirements.txt

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+-r requirements.txt
+pytest~=3.0.7
+pytest-asyncio~=0.5.0
+pytest-aiohttp~=0.1.3

tests/test_util.py

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+from unittest import mock
+
+
+from backport import util
+
+
+def test_title_normalization():
+    title = "abcd"
+    body = "1234"
+    assert util.normalize_title(title, body) == title
+
+    title = "[2.7] bpo-29243: Fix Makefile with respect to --enable-optimizations …"
+    body = "…(GH-1478)\r\n\r\nstuff"
+    expected = '[2.7] bpo-29243: Fix Makefile with respect to --enable-optimizations (GH-1478)'
+    assert util.normalize_title(title, body) == expected
+
+    title = "[2.7] bpo-29243: Fix Makefile with respect to --enable-optimizations …"
+    body = "…(GH-1478)"
+    assert util.normalize_title(title, body) == expected
+
+    title = "[2.7] bpo-29243: Fix Makefile with respect to --enable-optimizations (GH-14…"
+    body = "…78)"
+    assert util.normalize_title(title, body) == expected
+
+
+def test_get_participants_different_creator_and_committer():
+    assert util.get_participants("miss-islington", "bedevere-bot") \
+           == "@miss-islington and @bedevere-bot"
+
+
+def test_get_participants_same_creator_and_committer():
+    assert util.get_participants("miss-islington",
+                            "miss-islington") == "@miss-islington"
+
+
+@mock.patch('subprocess.check_output')
+def test_is_cpython_repo_contains_first_cpython_commit(subprocess_check_output):
+    mock_output = b"""commit 7f777ed95a19224294949e1b4ce56bbffcb1fe9f
+Author: Guido van Rossum <guido@python.org>
+Date:   Thu Aug 9 14:25:15 1990 +0000
+
+    Initial revision"""
+    subprocess_check_output.return_value = mock_output
+    assert util.is_cpython_repo()
+
+
+def test_is_not_cpython_repo():
+    assert util.is_cpython_repo() == False