Add unit test build to OSS-Fuzz build.sh (#287)

fuzzing/build.sh

@@ -6,3 +6,38 @@ cmake -S . -B build -DBUILD_FUZZER=ON && cmake --build build --target install
 mkdir -p corpus
 find $SRC/tomlplusplus -name "*.toml" -exec cp {} corpus \;
 zip -q -j $OUT/toml_fuzzer_seed_corpus.zip corpus/*
+
+# Build unit test
+clang++ -std=c++17 -O2 -DUSE_VENDORED_LIBS=1 \
+    -Iinclude -Itests \
+    tests/at_path.cpp \
+    tests/conformance_burntsushi_invalid.cpp \
+    tests/conformance_burntsushi_valid.cpp \
+    tests/conformance_iarna_invalid.cpp \
+    tests/conformance_iarna_valid.cpp \
+    tests/formatters.cpp \
+    tests/for_each.cpp \
+    tests/impl_toml.cpp \
+    tests/main.cpp \
+    tests/manipulating_arrays.cpp \
+    tests/manipulating_parse_result.cpp \
+    tests/manipulating_tables.cpp \
+    tests/manipulating_values.cpp \
+    tests/parsing_arrays.cpp \
+    tests/parsing_booleans.cpp \
+    tests/parsing_comments.cpp \
+    tests/parsing_dates_and_times.cpp \
+    tests/parsing_floats.cpp \
+    tests/parsing_integers.cpp \
+    tests/parsing_key_value_pairs.cpp \
+    tests/parsing_spec_example.cpp \
+    tests/parsing_strings.cpp \
+    tests/parsing_tables.cpp \
+    tests/path.cpp \
+    tests/tests.cpp \
+    tests/user_feedback.cpp \
+    tests/using_iterators.cpp \
+    tests/visit.cpp \
+    tests/windows_compat.cpp \
+    -o unit_tests \
+    -pthread