Default MATERIALX_BUILD_TESTS to false

This changelist sets the default for MATERIALX_BUILD_TESTS to false, since this build option generates a relatively heavyweight cache of the libraries and resources folders.

Often, developers want to build the Viewer or Graph Editor in isolation, and in these situations it's more natural for MATERIALX_BUILD_TESTS to be a feature that is opt-in rather than opt-out.

.github/workflows/main.yml

@@ -198,7 +198,7 @@ jobs:
       run: find source \( -name *.h -o -name *.cpp -o -name *.mm -o -name *.inl \) ! -path "*/External/*" ! -path "*/NanoGUI/*" | xargs clang-format -i --verbose
 
     - name: CMake Generate
-      run: cmake -S . -B build -DMATERIALX_BUILD_PYTHON=ON -DMATERIALX_BUILD_VIEWER=ON -DMATERIALX_BUILD_GRAPH_EDITOR=ON -DMATERIALX_TEST_RENDER=OFF -DMATERIALX_WARNINGS_AS_ERRORS=ON ${{matrix.cmake_config}}
+      run: cmake -S . -B build -DMATERIALX_BUILD_PYTHON=ON -DMATERIALX_BUILD_VIEWER=ON -DMATERIALX_BUILD_GRAPH_EDITOR=ON -DMATERIALX_BUILD_TESTS=ON -DMATERIALX_TEST_RENDER=OFF -DMATERIALX_WARNINGS_AS_ERRORS=ON ${{matrix.cmake_config}}
 
     - name: CMake Build
       run: cmake --build build --target install --config Release --parallel 2

CMakeLists.txt

@@ -44,7 +44,7 @@ option(MATERIALX_BUILD_GEN_MDL "Build the MDL shader generator back-end." ON)
 option(MATERIALX_BUILD_GEN_MSL "Build the MSL shader generator back-end." ON)
 option(MATERIALX_BUILD_RENDER "Build the MaterialX Render modules." ON)
 option(MATERIALX_BUILD_OIIO "Build OpenImageIO support for MaterialXRender." OFF)
-option(MATERIALX_BUILD_TESTS "Build unit tests." ON)
+option(MATERIALX_BUILD_TESTS "Build unit tests." OFF)
 option(MATERIALX_BUILD_BENCHMARK_TESTS "Build benchmark tests." OFF)
 
 option(MATERIALX_BUILD_SHARED_LIBS "Build MaterialX libraries as shared rather than static." OFF)
@@ -132,7 +132,6 @@ mark_as_advanced(MATERIALX_BUILD_GEN_MDL)
 mark_as_advanced(MATERIALX_BUILD_GEN_MSL)
 mark_as_advanced(MATERIALX_BUILD_RENDER)
 mark_as_advanced(MATERIALX_BUILD_OIIO)
-mark_as_advanced(MATERIALX_BUILD_TESTS)
 mark_as_advanced(MATERIALX_BUILD_BENCHMARK_TESTS)
 mark_as_advanced(MATERIALX_BUILD_SHARED_LIBS)
 mark_as_advanced(MATERIALX_NAMESPACE_SUFFIX)