Add a unit tests for enforce()

unitTests/CMakeLists.txt

@@ -3,6 +3,7 @@ add_executable(unit_tests mainTestRunner.cpp
     test_types.cpp
     test_tiffheader.cpp
     test_futils.cpp
+    test_enforce.cpp
     test_safe_op.cpp
 )
 

unitTests/test_enforce.cpp

@@ -0,0 +1,24 @@
+#include <enforce.hpp>
+
+#include "gtestwrapper.h"
+
+TEST(enforce, errMessage)
+{
+    try {
+        enforce(false, Exiv2::kerErrorMessage, "an error occurred");
+    } catch (const Exiv2::Error& e) {
+        ASSERT_STREQ(e.what(), "an error occurred");
+    }
+}
+
+TEST(enforce, exceptionThrown)
+{
+    ASSERT_NO_THROW(enforce(true, Exiv2::kerErrorMessage));
+
+    ASSERT_THROW(enforce(false, Exiv2::kerErrorMessage), Exiv2::Error);
+    ASSERT_THROW(enforce<std::overflow_error>(false, "error message"), std::overflow_error);
+    ASSERT_THROW(enforce(false, Exiv2::kerMallocFailed), Exiv2::Error);
+    ASSERT_THROW(enforce(false, Exiv2::kerErrorMessage, "error message"), Exiv2::Error);
+    ASSERT_THROW(enforce(false, Exiv2::kerDataSourceOpenFailed, "path", "strerror"), Exiv2::Error);
+    ASSERT_THROW(enforce(false, Exiv2::kerCallFailed, "path", "strerror", "function"), Exiv2::Error);
+}