Add test coverage tests.

.coveragerc

@@ -0,0 +1,11 @@
+[run]
+source = z3c.table
+
+[report]
+precision = 2
+exclude_lines =
+    pragma: no cover
+    if __name__ == '__main__':
+    raise NotImplementedError
+    self.fail
+    raise AssertionError

.gitignore

@@ -1,5 +1,6 @@
 *.egg-info/
 *.py[co]
+.coverage
 .installed.cfg
 .tox/
 bin/

.travis.yml

@@ -6,9 +6,12 @@ python:
     - pypy
 install:
     - pip install -U pip setuptools
+    - pip install -U coverage coveralls
     - pip install -U -e .[test]
 script:
-    - zope-testrunner --test-path=src
+    - coverage run -m zope.testrunner --test-path=src
+after_success:
+    - coveralls
 notifications:
     email: false
 cache: pip

tox.ini

@@ -1,8 +1,17 @@
 [tox]
-envlist = py27,py35,py36,pypy
+envlist = py27,py35,py36,pypy,coverage
 
 [testenv]
 usedevelop = true
 commands =
     zope-testrunner --test-path=src []
 extras = test
+
+[testenv:coverage]
+usedevelop = true
+basepython = python3.6
+commands =
+    coverage run -m zope.testrunner --test-path=src []
+    coverage report --fail-under=96
+deps =
+    coverage