Fix unit tests; restore exception cmake cache variable

Author: phdum-a

cmake/ExternalMFEM.cmake

@@ -77,7 +77,7 @@ if(CMAKE_BUILD_TYPE MATCHES "Debug|debug|DEBUG")
 endif()
 
 # Replace mfem abort calls with exceptions for testing, default off
-set(PALACE_MFEM_USE_EXCEPTIONS NO)
+set(PALACE_MFEM_USE_EXCEPTIONS NO CACHE BOOL "MFEM throw exceptions instead of abort calls")
 
 set(MFEM_OPTIONS ${PALACE_SUPERBUILD_DEFAULT_ARGS})
 list(APPEND MFEM_OPTIONS

test/unit/test-config.cpp

@@ -1,3 +1,6 @@
+#include <fstream>
+#include <iostream>
+#include <sstream>
 #include <string>
 #include <fmt/format.h>
 #include <catch2/catch_test_macros.hpp>

test/unit/test-tablecsv.cpp

@@ -10,6 +10,7 @@ using namespace palace;
 TEST_CASE("TableCSV", "[tablecsv]")
 {
   Table table{};
+  table.col_options.float_precision = 9;
   table.reserve(5, 2);
 
   // Quick defaults.