Measure coverage of the test code (#233)

.travis.yml

@@ -13,14 +13,14 @@ install:
 - pip install -r requirements-test.txt
 - pip install coveralls wheel
 script:
-- py.test -n 0 --cov src/pytest_postgresql
+- py.test -n 0
 after_success:
 - coveralls
 jobs:
   include:
     - stage: xdist
       python: 3.7
-      script: py.test -n 1 --cov src/pytest_postgresql tests
+      script: py.test -n 1
     - stage: linters
       python: 3.7
       install:

pytest.ini

@@ -1,5 +1,5 @@
 [pytest]
-addopts = --max-slave-restart=0 --showlocals --verbose
+addopts = --max-slave-restart=0 --showlocals --verbose --cov src/pytest_postgresql --cov tests
 postgresql_exec = /usr/lib/postgresql/9.6/bin/pg_ctl
 testpaths = tests
 xfail_strict = true