Separate tests into folders.

Build in a matrix?

tests/examples/__init__.py

@@ -0,0 +1,11 @@
+if __name__ == '__main__':
+    import os
+    import glob
+    import unittest
+    test_file_strings = glob.glob('test_*.py')
+    module_strings = [str[0:len(str)-3] for str in test_file_strings]
+    suites = [unittest.defaultTestLoader.loadTestsFromName(str) for str
+              in module_strings]
+    testSuite = unittest.TestSuite(suites)
+
+    unittest.TextTestRunner(verbosity=2).run(testSuite)

tests/examples/test_example_linear.py

@@ -0,0 +1,13 @@
+import unittest
+import sys
+from SimPEG.Examples import Linear
+import numpy as np
+
+class TestLinear(unittest.TestCase):
+
+    def test_running(self):
+        Linear.run(100, plotIt=False)
+        self.assertTrue(True)
+
+if __name__ == '__main__':
+    unittest.main()