Fix test coverage reporting
diff --git a/tools/dockerfile/test/multilang_jessie_x64/Dockerfile b/tools/dockerfile/test/multilang_jessie_x64/Dockerfile
index 5d0c168..ea57d88 100644
--- a/tools/dockerfile/test/multilang_jessie_x64/Dockerfile
+++ b/tools/dockerfile/test/multilang_jessie_x64/Dockerfile
@@ -135,6 +135,10 @@
RUN pip install virtualenv
RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.2.0 six==1.10.0
+# Install coverage for Python test coverage reporting
+RUN pip install coverage
+ENV PATH ~/.local/bin:$PATH
+
# Prepare ccache
RUN ln -s /usr/bin/ccache /usr/local/bin/gcc
RUN ln -s /usr/bin/ccache /usr/local/bin/g++