Separate tests into folders.

Build in a matrix?

.travis.yml

@@ -4,6 +4,12 @@ python:
 
 sudo: false
 
+env:
+    - TEST_DIR=tests/utils
+    - TEST_DIR=tests/mesh
+    - TEST_DIR=tests/base
+    - TEST_DIR=tests/examples
+
 # Setup anaconda
 before_install:
   - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then wget http://repo.continuum.io/miniconda/Miniconda-3.8.3-Linux-x86_64.sh -O miniconda.sh; else wget http://repo.continuum.io/miniconda/Miniconda3-3.8.3-Linux-x86_64.sh -O miniconda.sh; fi
@@ -11,20 +17,17 @@ before_install:
   - ./miniconda.sh -b
   - export PATH=/home/travis/anaconda/bin:/home/travis/miniconda/bin:$PATH
   - conda update --yes conda
-  # The next couple lines fix a crash with multiprocessing on Travis and are not specific to using Miniconda
-  # - sudo rm -rf /dev/shm
-  # - sudo ln -s /run/shm /dev/shm
 
 # Install packages
 install:
-  - conda install --yes pip python=$TRAVIS_PYTHON_VERSION numpy scipy matplotlib cython
+  - conda install --yes pip python=$TRAVIS_PYTHON_VERSION numpy scipy matplotlib cython ipython
   - pip install nose-cov python-coveralls
   # - pip install -r requirements.txt
   - python setup.py install
 
 # Run test
 script:
-  - nosetests --with-cov --cov SimPEG --cov-config .coveragerc -v -s
+  - nosetests $TEST_DIR --with-cov --cov SimPEG --cov-config .coveragerc -v -s
 
 # Calculate coverage
 after_success: