Run coverage for the spack install command as well as spack test.

- Also don't run coverage on OSX.

.travis.yml

@@ -46,7 +46,7 @@ sudo: false
 addons:
   apt:
     packages:
-      - python
+      - gfortran
       - graphviz
       - libyaml-dev
 
@@ -79,7 +79,7 @@ before_script:
 script: share/spack/qa/run-$TEST_SUITE-tests
 
 after_success:
-  - if [[ $TEST_SUITE == unit && $TRAVIS_PYTHON_VERSION == 2.7 ]]; then coveralls; fi
+  - if [[ $TEST_SUITE == unit && $TRAVIS_PYTHON_VERSION == 2.7 && $TRAVIS_OS_NAME == "linux" ]]; then coveralls; fi
 
 #=============================================================================
 # Notifications

share/spack/qa/run-unit-tests

@@ -40,12 +40,13 @@ cd "$SPACK_ROOT"
 source "$SPACK_ROOT/share/spack/setup-env.sh"
 spack compilers
 spack config get compilers
-spack install -v libdwarf
 
 # Run unit tests with code coverage
 if [[ "$TRAVIS_PYTHON_VERSION" == 2.7 ]]; then
+    coverage run bin/spack install -v libdwarf
     coverage run bin/spack test "$@"
     coverage combine
 else
+    spack install -v libdwarf
     spack test "$@"
 fi