3 files changed, 17 insertions, 5 deletions
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index e0d93eef5..233d53d1c 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -2030,17 +2030,23 @@ itest!(unbuffered_stdout {
 
 // Cannot write the expression to evaluate as "console.log(typeof gc)"
 // because itest! splits args on whitespace.
-itest!(eval_v8_flags {
+itest!(v8_flags_eval {
   args: "eval --v8-flags=--expose-gc console.log(typeof(gc))",
   output: "v8_flags.js.out",
 });
 
-itest!(run_v8_flags {
+itest!(v8_flags_run {
   args: "run --v8-flags=--expose-gc v8_flags.js",
   output: "v8_flags.js.out",
 });
 
-itest!(run_v8_help {
+itest!(v8_flags_unrecognized {
+  args: "repl --v8-flags=--foo,bar,--trace-gc,-baz",
+  output: "v8_flags_unrecognized.out",
+  exit_code: 1,
+});
+
+itest!(v8_help {
   args: "repl --v8-flags=--help",
   output: "v8_help.out",
 });
diff --git a/cli/tests/v8_flags_unrecognized.out b/cli/tests/v8_flags_unrecognized.out
new file mode 100644
index 000000000..56e70f830
--- /dev/null
+++ b/cli/tests/v8_flags_unrecognized.out
@@ -0,0 +1,5 @@
+error: V8 did not recognize flag '--foo'
+error: V8 did not recognize flag 'bar'
+error: V8 did not recognize flag '-baz'
+
+For a list of V8 flags, use '--v8-flags=--help'
diff --git a/cli/tests/v8_help.out b/cli/tests/v8_help.out
index 3d7aac28d..006d73557 100644
--- a/cli/tests/v8_help.out
+++ b/cli/tests/v8_help.out
@@ -1,3 +1,4 @@
 [WILDCARD]
-Synopsis:
-[WILDCARD]d8[WILDCARD]
-\ No newline at end of file
+Options:
+[WILDCARD]
+  --trace-gc [WILDCARD]