build: download fakeit mocking library (cmake)

Co-Authored-by: Lorenzo Fontana <lo@linux.com>
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

cmake/modules/DownloadFakeIt.cmake

@@ -0,0 +1,39 @@
+#
+# Copyright (C) 2016-2019 Draios Inc dba Sysdig.
+#
+# This file is part of falco .
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+include(ExternalProject)
+
+set(FAKEIT_INCLUDE ${CMAKE_BINARY_DIR}/fakeit-prefix/include)
+
+set(FAKEIT_EXTERNAL_URL
+    URL
+    https://github.com/eranpeer/fakeit/archive/2.0.5.tar.gz
+    URL_HASH
+    MD5=d3d21b909cebaea5b780af5500bf384e)
+
+ExternalProject_Add(
+  fakeit-external
+  PREFIX ${CMAKE_BINARY_DIR}/fakeit-prefix
+  ${FAKEIT_EXTERNAL_URL}
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND
+    ${CMAKE_COMMAND}
+    -E
+    copy
+    ${CMAKE_BINARY_DIR}/fakeit-prefix/src/fakeit-external/single_header/catch/fakeit.hpp
+    ${FAKEIT_INCLUDE}/fakeit.hpp)