diff --git a/test/run_tests.js b/test/run_tests.js
index eee69b7..defb742 100644
--- a/test/run_tests.js
+++ b/test/run_tests.js
@@ -6,13 +6,25 @@ const case_path = "./cases"
 const files = await fs.readdir(case_path)
 
 for (const file of files) {
-  const script = await fs.readFile(`${case_path}/${file}`, {encoding: "utf8"})
-  const first_line = script.split("\n")[0]
+  const source = await fs.readFile(`${case_path}/${file}`, {encoding: "utf8"})
+  const first_line = source.split("\n")[0]
   const expected = first_line.split("EXPECT")[1].trim()
-  const result = run(script).result
-  t.test(`testing ${file}: EXPECT ${expected}, GOT ${result}`, 
-    t => {
-      t.equal(expected, result)
-      t.end()
-    })
+  if (expected === "PANIC") expect_panic(file, source)
+  else expect_result(file, source, expected)
+}
+
+function expect_panic(file, source) {
+  const result = run(source).errors[0]
+  t.test(`testing ${file}: EXPECT PANIC`, t => {
+    t.ok(result)
+    t.end()
+  })
+}
+
+function expect_result(file, source, expected) {
+  const result = run(source).result
+  t.test(`testing ${file}: EXPECT ${expected}, GOT ${result}`, t => {
+    t.equal(expected, result)
+    t.end()
+  }) 
 }