Add CMake configuration for test/googletest and test/unit

For CMake builds, latest googletest 1.8.0 is downloaded.

Following officially recommended integration for CMake-enabled projects
https://github.com/google/googletest/blob/master/googletest/README.md

  "Use CMake to download GoogleTest as part of the build's configure step.
  This is just a little more complex, but doesn't have the limitations
  of the other methods."

Since, our copy of test/googletest
- is a very minimalist copy of googletest
- does not include any official CMake scripts
- would require copying parts of googletest CMakeLists.txt, compilater/linker flags (e.g. -lpthreads)
for reliable multi-platform builds, it is reasoanable to rely on download
All pros and cons advantages are discussed in teh README.md linked above.

Closes #1033

1 files changed, 18 insertions, 0 deletions

diff --git a/test/googletest/CMakeLists.txt.in b/test/googletest/CMakeLists.txt.in
new file mode 100644
index 00000000..38f90ca5
--- /dev/null
+++ b/test/googletest/CMakeLists.txt.in
@@ -0,0 +1,18 @@
+# Source https://github.com/google/googletest/blob/master/googletest/README.md
+cmake_minimum_required(VERSION 2.8.2) # minimum version for ExternalProject_Add
+
+project(googletest-download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(googletest
+  URL https://github.com/google/googletest/archive/release-1.8.0.zip
+  URL_HASH SHA1=667f873ab7a4d246062565fad32fb6d8e203ee73
+  DOWNLOAD_NO_PROGRESS ON
+  SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
+  BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND     ""
+  TEST_COMMAND      ""
+  # Disable install step
+  INSTALL_COMMAND   ""
+)
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