better errors and cleanp

tests/libslime/build.sh

@@ -0,0 +1,21 @@
+echo ""
+echo "----------------------"
+echo "  compiling libslime  "
+echo "----------------------"
+echo ""
+
+clang++ --std=c++17 \
+        ../../src/libslime.cpp -c -o libslime.o \
+        -I../../3rd/  \
+        -I../../src/
+
+echo ""
+echo "----------------------"
+echo "  compiling main      "
+echo "----------------------"
+echo ""
+
+clang++ --std=c++17                 \
+        main.cpp -o main libslime.o \
+        -I../../include/            \
+        -I../../3rd/

tests/libslime/main.cpp

@@ -0,0 +1,6 @@
+#include <libslime.h>
+
+int main() {
+    int res = Slime::run_all_tests();
+    return res ? 0 : 1;
+}