ci: Fixed coverage run options

Something changed in coverage making the coverage data to disappear.
Added the option --cov-append when running pytest to avoid the data to
vanish.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

Makefile

@@ -74,8 +74,7 @@ test-all: tox.ini## run tests on every Python version with tox
 	tox
 
 coverage: ## check code coverage quickly with the default Python
-	py.test --cov=abimap --cov-config .coveragerc --cov-report=term-missing -vv tests
-	coverage combine --append
+	py.test --cov=abimap --cov-append --cov-config .coveragerc --cov-report=term-missing -vv tests
 	coverage report
 	coverage html
 	$(BROWSER) htmlcov/index.html

ci/templates/tox.ini

@@ -26,7 +26,7 @@ deps =
 commands =
     make bootstrap-tests
     nocov: {posargs:py.test -vv --ignore=src}
-    cover: {posargs:py.test --cov --cov-report=term-missing -vv}
+    cover: {posargs:py.test --cov --cov-append --cov-report=term-missing -vv}
 
 [testenv:bootstrap]
 deps =
@@ -97,7 +97,6 @@ deps = coverage
 skip_install = true
 usedevelop = false
 commands =
-    coverage combine --append
     coverage report
     coverage html
 

tox.ini

@@ -26,7 +26,7 @@ deps =
 commands =
     make bootstrap-tests
     nocov: {posargs:py.test -vv --ignore=src}
-    cover: {posargs:py.test --cov --cov-report=term-missing -vv}
+    cover: {posargs:py.test --cov --cov-append --cov-report=term-missing -vv}
 
 [testenv:bootstrap]
 deps =
@@ -97,7 +97,6 @@ deps = coverage
 skip_install = true
 usedevelop = false
 commands =
-    coverage combine --append
     coverage report
     coverage html