Fixed bug happening in travis because of an old pytest-cov version

Author: Sylvain MARIE

.travis.yml

@@ -7,33 +7,33 @@ matrix:
   fast_finish: true
   include:
     - python: 2.7
-      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0"  # indeed recent pytest_html require pytest>=3
+      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0" PYTEST_COV_VERSION="==2.6.0"  # indeed recent pytest_html require pytest>=3 and pytest-cov requires pytest>=3.6
     - python: 2.7
-      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 2.7
-      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 3.5
-      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0"  # indeed recent pytest_html require pytest>=3
+      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0" PYTEST_COV_VERSION="==2.6.0" # indeed recent pytest_html require pytest>=3
     - python: 3.5
-      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 3.5
-      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 3.6
-      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0"  # indeed recent pytest_html require pytest>=3
+      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0" PYTEST_COV_VERSION="==2.6.0" # indeed recent pytest_html require pytest>=3
     - python: 3.6
-      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 3.6
-      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
     - python: 3.7
-      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0"  # indeed recent pytest_html require pytest>=3
+      env: PYTEST_VERSION="<3" PYTEST_HTML_VERSION="==1.9.0" PYTEST_COV_VERSION="==2.6.0" # indeed recent pytest_html require pytest>=3
       dist: xenial
       sudo: true
     - python: 3.7
-      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<4" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
       dist: xenial
       sudo: true
     - python: 3.7
-      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION=""
+      env: PYTEST_VERSION="<5" PYTEST_HTML_VERSION="" PYTEST_COV_VERSION=""
       dist: xenial
       sudo: true
 

ci_tools/requirements-pip.txt

@@ -17,7 +17,7 @@ pytest-steps
 pytest-harvest
 
 # --- to generate the reports (see scripts in ci_tools, called by .travis)
-pytest-cov==2.6.0  # after 2.6.1 it requires pytest 3.6
+pytest-cov==$PYTEST_COV_VERSION  # after 2.6.1 it requires pytest 3.6
 
 # --- to generate the doc (see .travis)
 mkdocs-material  # ==2.7.3