requirements: Reduce duplication

Simply installing packages will ensure that most of the dependencies in
'setup.py' are installed, meaning 'test-reqs.txt' need only contain
those necessary for testing.

The only notable change is that the 'simplejson' module is dropped from
the requirements list. This included as a dependency for the PyPy
target, but it appears that this is not necessary today (though it may
have been when the target was added in 2011).

This retains 'setup.py test' which, as noted in the tox docs [1], is
sometimes expected for downstream distribution testing. We may wish to
find a way to synchronize requirements between 'test-reqs.txt' and this
section in the future, but that's work for another day.

[1] https://tox.readthedocs.io/en/latest/example/basic.html#integration-with-setup-py-test-command

Signed-off-by: Stephen Finucane <stephen@that.guru>

1 files changed, 10 insertions, 6 deletions

diff --git a/setup.py b/setup.py
index b2d7ad4cc..618620b50 100644
--- a/setup.py
+++ b/setup.py
@@ -69,10 +69,17 @@ extras_require = {
     ],
     'test': [
         'pytest',
-        'mock',  # it would be better for 'test:python_version in 2.7'
-        'simplejson',  # better: 'test:platform_python_implementation=="PyPy"'
+        'pytest-cov',
         'html5lib',
     ],
+    'test:python_version<"3"': [
+        'enum34',
+        'mock',
+    ],
+    'test:python_version>="3"': [
+        'mypy',
+        'typed_ast',
+    ],
 }
 
 # Provide a "compile_catalog" command that also creates the translated
@@ -83,10 +90,7 @@ cmdclass = {}
 try:
     from babel.messages.pofile import read_po
     from babel.messages.frontend import compile_catalog
-    try:
-        from simplejson import dump
-    except ImportError:
-        from json import dump
+    from json import dump
 except ImportError:
     pass
 else: