Move integration tests to tests dir in workspace root

tests/exception_handling.rs

@@ -0,0 +1,23 @@
+mod runtime_core_tests;
+
+use runtime_core_tests::{get_compiler, wat2wasm};
+use wasmer_runtime_core::{compile_with, imports};
+
+#[test]
+fn exception_handling_works() {
+    const MODULE: &str = r#"
+(module
+  (func (export "throw_trap")
+    unreachable
+  ))
+"#;
+
+    let wasm_binary = wat2wasm(MODULE.as_bytes()).expect("WAST not valid or malformed");
+    let module = compile_with(&wasm_binary, &get_compiler()).unwrap();
+
+    let imports = imports! {};
+    for _ in 0..2 {
+        let instance = module.instantiate(&imports).unwrap();
+        assert!(instance.call("throw_trap", &[]).is_err());
+    }
+}