Switch testing to pytest add benchmark test (#70)

* Switch testing to pytest,
Use pytest-benchmark so that regressions can be tracked in future.

* travis ensure up to date py.test

* Move benchmarks to their own test file

* pytest doesn't like very old versions of python

Author: mariusvniekerk

.travis.yml

@@ -1,23 +1,24 @@
 language: python
 python:
-    - "2.6"
     - "2.7"
-    - "3.2"
     - "3.3"
     - "3.4"
     - "3.5"
-    - "3.6-dev"
+    - "3.6"
+    - "3.7-dev"
     - "pypy"
+    - "pypy3"
 
 install:
     - pip install coverage
+    - pip install --upgrade pytest pytest-benchmark
 
 script:
     - |
       if [[ $(bc <<< "$TRAVIS_PYTHON_VERSION >= 3.3") -eq 1 ]]; then
-         nosetests --with-doctest
+         py.test --doctest-modules multipledispatch
       else
-         nosetests --with-doctest -I '.*_3only.py$'
+         py.test --doctest-modules --ignore=multipledispatch/tests/test_dispatcher_3only.py multipledispatch
       fi
 
 after_success:

multipledispatch/tests/test_benchmark.py

@@ -0,0 +1,45 @@
+from multipledispatch import dispatch
+import pytest
+
+
+@dispatch(int)
+def isint(x):
+    return True
+
+
+@dispatch(object)
+def isint(x):
+    return False
+
+
+@dispatch(object, object)
+def isint(x, y):
+    return False
+
+
+@pytest.mark.parametrize("val", [1, 'a'])
+def test_benchmark_call_single_dispatch(benchmark, val):
+    benchmark(isint, val)
+
+
+@pytest.mark.parametrize("val", [(1, 4)])
+def test_benchmark_call_multiple_dispatch(benchmark, val):
+    benchmark(isint, *val)
+
+
+def test_benchmark_add_and_use_instance(benchmark):
+    namespace = {}
+
+    @benchmark
+    def inner():
+        @dispatch(int, int, namespace=namespace)
+        def mul(x, y):
+            return x * y
+
+        @dispatch(str, int, namespace=namespace)
+        def mul(x, y):
+            return x * y
+
+        mul(4, 5)
+        mul('x', 5)
+

multipledispatch/tests/test_core.py

@@ -28,7 +28,7 @@ def f(x):
     assert raises(NotImplementedError, lambda: f('hello'))
 
 
-def test_multipledispatch():
+def test_multipledispatch(benchmark):
     @dispatch(int, int)
     def f(x, y):
         return x + y