ensure old versions of gmpy(2) work

Author: tomato42

.travis.yml

@@ -21,6 +21,10 @@ matrix:
         env: TOX_ENV=py26
       - python: 2.7
         env: TOX_ENV=py27
+      - python: 2.7
+        env: TOX_ENV=py27_old_gmpy
+      - python: 2.7
+        env: TOX_ENV=py27_old_gmpy2
       - python: 2.7
         env: TOX_ENV=py27_old_six
       - python: 2.7

tox.ini

@@ -20,12 +20,26 @@ deps =
      py27_old_six: six==1.9.0
      py27_old_six: pytest
      py27_old_six: hypothesis
+# those are the oldest versions of gmpy and gmpy2 on PyPI (i.e. oldest we can
+# actually test), older versions may work, but are not easy to test
+     py27_old_gmpy: gmpy==1.15
+     py27_old_gmpy: pytest
+     py27_old_gmpy: hypothesis
+     py27_old_gmpy2: gmpy2==2.0.1
+     py27_old_gmpy2: pytest
+     py27_old_gmpy2: hypothesis
      py: pytest
      py: hypothesis
      py{33}: wheel<0.30
      coverage
 commands = coverage run --branch -m pytest {posargs:src/ecdsa}
 
+[testenv:py27_old_gmpy]
+basepython = python2.7
+
+[testenv:py27_old_gmpy2]
+basepython = python2.7
+
 [testenv:py27_old_six]
 basepython = python2.7