Add dependency for GMock

CI/before_script.linux.sh

@@ -1,8 +1,21 @@
-#!/bin/sh
+#!/bin/sh -e
 
 free -m
+
+env GENERATOR='Unix Makefiles' CONFIGURATION=Release CI/build_googletest.sh
+GOOGLETEST_DIR="$(pwd)/googletest/build"
+
 mkdir build
 cd build
 export CODE_COVERAGE=1
 if [ "${CC}" = "clang" ]; then export CODE_COVERAGE=0; fi
-${ANALYZE}cmake .. -DBUILD_WITH_CODE_COVERAGE=${CODE_COVERAGE} -DBUILD_UNITTESTS=1 -DCMAKE_INSTALL_PREFIX=/usr -DBINDIR=/usr/games  -DCMAKE_BUILD_TYPE="None" -DUSE_SYSTEM_TINYXML=TRUE
+${ANALYZE}cmake \
+    -DBUILD_WITH_CODE_COVERAGE=${CODE_COVERAGE} \
+    -DBUILD_UNITTESTS=1 \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DBINDIR=/usr/games \
+    -DCMAKE_BUILD_TYPE="None" \
+    -DUSE_SYSTEM_TINYXML=TRUE \
+    -DGTEST_ROOT="${GOOGLETEST_DIR}" \
+    -DGMOCK_ROOT="${GOOGLETEST_DIR}" \
+    ..