Format project with black (#467)

Format with line length 110 to match flake8

make black part of linting check

Update travis spec for updated black requirements

Add diff output for black on failure

update changelog

tests/unit/test_request.py

@@ -3,51 +3,60 @@ import pytest
 from vcr.request import Request, HeadersDict
 
 
-@pytest.mark.parametrize("method, uri, expected_str", [
-    ('GET', 'http://www.google.com/', '<Request (GET) http://www.google.com/>'),
-    ('OPTIONS', '*', '<Request (OPTIONS) *>'),
-    ('CONNECT', 'host.some.where:1234', '<Request (CONNECT) host.some.where:1234>')
-])
+@pytest.mark.parametrize(
+    "method, uri, expected_str",
+    [
+        ("GET", "http://www.google.com/", "<Request (GET) http://www.google.com/>"),
+        ("OPTIONS", "*", "<Request (OPTIONS) *>"),
+        ("CONNECT", "host.some.where:1234", "<Request (CONNECT) host.some.where:1234>"),
+    ],
+)
 def test_str(method, uri, expected_str):
-    assert str(Request(method, uri, '', {})) == expected_str
+    assert str(Request(method, uri, "", {})) == expected_str
 
 
 def test_headers():
-    headers = {'X-Header1': ['h1'], 'X-Header2': 'h2'}
-    req = Request('GET', 'http://go.com/', '', headers)
-    assert req.headers == {'X-Header1': 'h1', 'X-Header2': 'h2'}
-    req.headers['X-Header1'] = 'h11'
-    assert req.headers == {'X-Header1': 'h11', 'X-Header2': 'h2'}
+    headers = {"X-Header1": ["h1"], "X-Header2": "h2"}
+    req = Request("GET", "http://go.com/", "", headers)
+    assert req.headers == {"X-Header1": "h1", "X-Header2": "h2"}
+    req.headers["X-Header1"] = "h11"
+    assert req.headers == {"X-Header1": "h11", "X-Header2": "h2"}
 
 
 def test_add_header_deprecated():
-    req = Request('GET', 'http://go.com/', '', {})
-    pytest.deprecated_call(req.add_header, 'foo', 'bar')
-    assert req.headers == {'foo': 'bar'}
+    req = Request("GET", "http://go.com/", "", {})
+    pytest.deprecated_call(req.add_header, "foo", "bar")
+    assert req.headers == {"foo": "bar"}
 
 
-@pytest.mark.parametrize("uri, expected_port", [
-    ('http://go.com/', 80),
-    ('http://go.com:80/', 80),
-    ('http://go.com:3000/', 3000),
-    ('https://go.com/', 443),
-    ('https://go.com:443/', 443),
-    ('https://go.com:3000/', 3000),
-    ('*', None)
-])
+@pytest.mark.parametrize(
+    "uri, expected_port",
+    [
+        ("http://go.com/", 80),
+        ("http://go.com:80/", 80),
+        ("http://go.com:3000/", 3000),
+        ("https://go.com/", 443),
+        ("https://go.com:443/", 443),
+        ("https://go.com:3000/", 3000),
+        ("*", None),
+    ],
+)
 def test_port(uri, expected_port):
-    req = Request('GET', uri, '', {})
+    req = Request("GET", uri, "", {})
     assert req.port == expected_port
 
 
-@pytest.mark.parametrize("method, uri", [
-    ('GET', 'http://go.com/'),
-    ('GET', 'http://go.com:80/'),
-    ('CONNECT', 'localhost:1234'),
-    ('OPTIONS', '*')
-])
+@pytest.mark.parametrize(
+    "method, uri",
+    [
+        ("GET", "http://go.com/"),
+        ("GET", "http://go.com:80/"),
+        ("CONNECT", "localhost:1234"),
+        ("OPTIONS", "*"),
+    ],
+)
 def test_uri(method, uri):
-    assert Request(method, uri, '', {}).uri == uri
+    assert Request(method, uri, "", {}).uri == uri
 
 
 def test_HeadersDict():
@@ -55,23 +64,23 @@ def test_HeadersDict():
     # Simple test of CaseInsensitiveDict
     h = HeadersDict()
     assert h == {}
-    h['Content-Type'] = 'application/json'
-    assert h == {'Content-Type': 'application/json'}
-    assert h['content-type'] == 'application/json'
-    assert h['CONTENT-TYPE'] == 'application/json'
+    h["Content-Type"] = "application/json"
+    assert h == {"Content-Type": "application/json"}
+    assert h["content-type"] == "application/json"
+    assert h["CONTENT-TYPE"] == "application/json"
 
     # Test feature of HeadersDict: devolve list to first element
     h = HeadersDict()
     assert h == {}
-    h['x'] = ['foo', 'bar']
-    assert h == {'x': 'foo'}
+    h["x"] = ["foo", "bar"]
+    assert h == {"x": "foo"}
 
     # Test feature of HeadersDict: preserve original key case
     h = HeadersDict()
     assert h == {}
-    h['Content-Type'] = 'application/json'
-    assert h == {'Content-Type': 'application/json'}
-    h['content-type'] = 'text/plain'
-    assert h == {'Content-Type': 'text/plain'}
-    h['CONtent-tyPE'] = 'whoa'
-    assert h == {'Content-Type': 'whoa'}
+    h["Content-Type"] = "application/json"
+    assert h == {"Content-Type": "application/json"}
+    h["content-type"] = "text/plain"
+    assert h == {"Content-Type": "text/plain"}
+    h["CONtent-tyPE"] = "whoa"
+    assert h == {"Content-Type": "whoa"}