Update Zint

3rdparty/zint-2.10.0/frontend/tests/README

@@ -0,0 +1,22 @@
+Zint frontend test suite
+------------------------
+
+See <project-dir>/backend/tests/README to see how to build the test suite.
+In addition to the setup for the backend tests, the environment needs to be
+able to find the `zint` application using that name. In UNIX-like systems
+this can be configured by prepending the PATH variable with the frontend's
+directory inside the build directory:
+
+cd <build-dir>
+export PATH=$(pwd)/frontend:${PATH}
+
+
+------------------------------------------------------------------------------
+the frontend test will be automatically run by cmake's ctest, however manual
+invocation is also possible:
+
+cd <build-dir>/frontend/test
+./test_args
+
+As with the backend tests, individual test functions and single dataset items
+can be run using '-f <func-name>' and '-i <index>' etc.