[T] Disable snakemake tests when tee tool is not available.

Applications/Utils/Tests.cmake

@@ -300,7 +300,7 @@ AddTest(
     AmmerSubsurfaceGrid.vtu AmmerGridOutput.vtu MaterialIDs MaterialIDs 0 0
 )
 
-if(SNAKEMAKE AND NOT OGS_USE_MPI)
+if(SNAKEMAKE AND NOT OGS_USE_MPI AND TEE_TOOL_PATH)
     add_test(NAME snakemake_ExtractBoundary
         COMMAND ${SNAKEMAKE} -j 1
             --configfile ${PROJECT_BINARY_DIR}/buildinfo.yaml
@@ -485,7 +485,7 @@ if(TARGET VerticalSliceFromLayers AND GMSH)
 
 endif()
 
-if(TARGET GMSH2OGS AND SNAKEMAKE AND NOT OGS_USE_MPI)
+if(TARGET GMSH2OGS AND SNAKEMAKE AND NOT OGS_USE_MPI AND TEE_TOOL_PATH)
     add_test(NAME snakemake_GMSH2OGS_ExtractBoundary
         COMMAND ${SNAKEMAKE} --cores all
         --configfile ${PROJECT_BINARY_DIR}/buildinfo.yaml

scripts/cmake/Find.cmake

@@ -47,6 +47,10 @@ find_program(PANDOC_CITEPROC pandoc-citeproc)
 find_program(MODULE_CMD lmod PATHS /software/lmod/lmod/libexec)
 
 find_program(SNAKEMAKE snakemake HINTS ${LOCAL_VIRTUALENV_BIN_DIRS})
+find_program(TEE_TOOL_PATH tee)
+if(OGS_BUILD_TESTING AND SNAKEMAKE AND NOT TEE_TOOL_PATH)
+    message(WARNING "tee tool was not found. Snakemake tests are disabled!")
+endif()
 
 find_program(GMSH gmsh)