diff --git a/Cargo.lock b/Cargo.lock
index c62cbbfd87479d..afedc80aa293b0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3407,6 +3407,7 @@ version = "0.0.1"
 dependencies = [
  "deno_core",
  "futures",
+ "serde",
  "test_util",
 ]
 
diff --git a/test_plugin/Cargo.toml b/test_plugin/Cargo.toml
index 6830f33fe855ab..439559dca6912c 100644
--- a/test_plugin/Cargo.toml
+++ b/test_plugin/Cargo.toml
@@ -13,6 +13,7 @@ crate-type = ["cdylib"]
 [dependencies]
 deno_core = { path = "../core" }
 futures = "0.3.9"
+serde = "1"
 
 [dev-dependencies]
 test_util = { path = "../test_util" }
diff --git a/test_plugin/src/lib.rs b/test_plugin/src/lib.rs
index 105071751b3cd8..d1e0a869232da6 100644
--- a/test_plugin/src/lib.rs
+++ b/test_plugin/src/lib.rs
@@ -13,6 +13,7 @@ use deno_core::OpState;
 use deno_core::Resource;
 use deno_core::ResourceId;
 use deno_core::ZeroCopyBuf;
+use serde::Deserialize;
 
 #[no_mangle]
 pub fn init() -> Extension {
@@ -32,13 +33,20 @@ pub fn init() -> Extension {
     .build()
 }
 
+#[derive(Debug, Deserialize)]
+struct TestArgs {
+  val: String,
+}
+
 fn op_test_sync(
   _state: &mut OpState,
-  _args: (),
+  args: TestArgs,
   zero_copy: Option<ZeroCopyBuf>,
 ) -> Result<String, AnyError> {
   println!("Hello from sync plugin op.");
 
+  println!("args: {:?}", args);
+
   if let Some(buf) = zero_copy {
     let buf_str = std::str::from_utf8(&buf[..])?;
     println!("zero_copy: {}", buf_str);
@@ -49,11 +57,13 @@ fn op_test_sync(
 
 async fn op_test_async(
   _state: Rc<RefCell<OpState>>,
-  _args: (),
+  args: TestArgs,
   zero_copy: Option<ZeroCopyBuf>,
 ) -> Result<String, AnyError> {
   println!("Hello from async plugin op.");
 
+  println!("args: {:?}", args);
+
   if let Some(buf) = zero_copy {
     let buf_str = std::str::from_utf8(&buf[..])?;
     println!("zero_copy: {}", buf_str);
diff --git a/test_plugin/tests/integration_tests.rs b/test_plugin/tests/integration_tests.rs
index 203a8badedef24..e408f59db168d5 100644
--- a/test_plugin/tests/integration_tests.rs
+++ b/test_plugin/tests/integration_tests.rs
@@ -35,7 +35,24 @@ fn basic() {
   }
   println!("{:?}", output.status);
   assert!(output.status.success());
-  let expected = "Plugin rid: 3\nHello from sync plugin op.\nzero_copy: test\nop_test_sync returned: test\nHello from async plugin op.\nzero_copy: 123\nop_test_async returned: test\nHello from resource_table.add plugin op.\nTestResource rid: 4\nHello from resource_table.get plugin op.\nTestResource get value: hello plugin!\nHello from sync plugin op.\nOps completed count is correct!\nOps dispatched count is correct!\n";
+  let expected = "\
+    Plugin rid: 3\n\
+    Hello from sync plugin op.\n\
+    args: TestArgs { val: \"1\" }\n\
+    zero_copy: test\n\
+    op_test_sync returned: test\n\
+    Hello from async plugin op.\n\
+    args: TestArgs { val: \"1\" }\n\
+    zero_copy: 123\n\
+    op_test_async returned: test\n\
+    Hello from resource_table.add plugin op.\n\
+    TestResource rid: 4\n\
+    Hello from resource_table.get plugin op.\n\
+    TestResource get value: hello plugin!\n\
+    Hello from sync plugin op.\n\
+    args: TestArgs { val: \"1\" }\n\
+    Ops completed count is correct!\n\
+    Ops dispatched count is correct!\n";
   assert_eq!(stdout, expected);
   assert_eq!(stderr, "");
 }
diff --git a/test_plugin/tests/test.js b/test_plugin/tests/test.js
index 716b2ff9ac2023..5e0e6d5a48c869 100644
--- a/test_plugin/tests/test.js
+++ b/test_plugin/tests/test.js
@@ -42,7 +42,7 @@ if (
 function runTestSync() {
   const result = Deno.core.opSync(
     "op_test_sync",
-    null,
+    { val: "1" },
     new Uint8Array([116, 101, 115, 116]),
   );
 
@@ -56,7 +56,7 @@ function runTestSync() {
 async function runTestAsync() {
   const promise = Deno.core.opAsync(
     "op_test_async",
-    null,
+    { val: "1" },
     new Uint8Array([49, 50, 51]),
   );
 
@@ -95,7 +95,7 @@ function runTestResourceTable() {
 function runTestOpCount() {
   const start = Deno.metrics();
 
-  Deno.core.opSync("op_test_sync");
+  Deno.core.opSync("op_test_sync", { val: "1" });
 
   const end = Deno.metrics();