Docker Tests: Permit to execute tests on specific branch or commit

README.md

 
     docker run -e DATABASE_TYPE=sqlite tracim:tests
 
+##### Run test on specific commit/branch
+
+To run tests on specific branch or commit, use ``CHECKOUT`` parameter, eg:
+
+    docker run -e DATABASE_TYPE=postgresql -e CHECKOUT=<branch_or_commit_name> tracim:tests
+
 #### Run Prod/dev containers
 
 Environment variables are:

docker/Debian_Tests/entrypoint.sh

 # ENVIRONMENT VARIABLES ARE:
 #
 # * DATABASE_TYPE (values: postgresql, mysql, sqlite)
+# * CHECKOUT (values: a commit or branch name)
 #
 
+# If CHECKOUT is set, change repository HEAD
+if [ -n "$CHECKOUT" ]; then
+    cd /tracim && git checkout ${CHECKOUT}
+    echo "CHECKOUT set to $CHECKOUT"
+fi
+
 # Ensure DATABASE_TYPE is set
 if ! [ -n "$DATABASE_TYPE" ]; then
     echo "You must set DATABASE_TYPE environment variable"