TST: test pip install with minimal system

Don't preinstall packages, except numpy; let pip install dependencies
for some tests.

.travis.yml

@@ -33,17 +33,24 @@ matrix:
     # Absolute minimum dependencies
     - python: 2.7
       env:
+        # Definitive source for these in nipy/info.py
         - DEPENDS="numpy==1.6.0 scipy==0.9.0 sympy==0.7.0 nibabel==1.2.0"
     # Test compiling against external lapack
     - python: 3.4
       env:
         - NIPY_EXTERNAL_LAPACK=1
-    - python: 3.4
+    - python: 2.7
       env:
         - INSTALL_TYPE=sdist
-    - python: 3.4
+        - DEPENDS="numpy==1.6.0"
+    - python: 2.7
       env:
         - INSTALL_TYPE=wheel
+        - DEPENDS="numpy==1.6.0"
+    - python: 2.7
+      env:
+        - INSTALL_TYPE=requirements
+        - DEPENDS=
 
 before_install:
     - source tools/travis_tools.sh
@@ -64,12 +71,16 @@ install:
       if [ "$INSTALL_TYPE" == "setup" ]; then
           python setup.py install
       elif [ "$INSTALL_TYPE" == "sdist" ]; then
-        python setup.py sdist
-        pip install dist/*.tar.gz
+        python setup_egg.py egg_info  # check egg_info while we're here
+        python setup_egg.py sdist
+        wheelhouse_pip_install dist/*.tar.gz
       elif [ "$INSTALL_TYPE" == "wheel" ]; then
         pip install wheel
-        python setup.py bdist_wheel
-        pip install dist/*.whl
+        python setup_egg.py bdist_wheel
+        wheelhouse_pip_install dist/*.whl
+      elif [ "$INSTALL_TYPE" == "requirements" ]; then
+        wheelhouse_pip_install -r requirements.txt
+        python setup.py install
       fi
 # command to run tests, e.g. python setup.py test
 script:

nipy/info.py

@@ -131,6 +131,8 @@
 
 # minimum versions
 # Update in readme text above
+# Update in .travis.yml
+# Update in requirements.txt
 NUMPY_MIN_VERSION='1.6.0'
 SCIPY_MIN_VERSION = '0.9.0'
 NIBABEL_MIN_VERSION = '1.2'

requirements.txt

@@ -0,0 +1,5 @@
+# See nipy/info.py for requirement definitions
+numpy>=1.6.0
+scipy>=0.9.0
+sympy>=0.7.0
+nibabel>=1.2.0