From 282b175e9402b7270a00fa7d286fbed31e6c9b04 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 00:06:26 -0400
Subject: [PATCH 01/12] prototype op_hello

---
 op_hello/Cargo.toml   | 13 +++++++++++++
 op_hello/src/hello.ts |  5 +++++
 op_hello/src/lib.rs   | 24 ++++++++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 op_hello/Cargo.toml
 create mode 100644 op_hello/src/hello.ts
 create mode 100644 op_hello/src/lib.rs

diff --git a/op_hello/Cargo.toml b/op_hello/Cargo.toml
new file mode 100644
index 00000000000000..68313b5e03ace6
--- /dev/null
+++ b/op_hello/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "op_hello"
+version = "0.1.0"
+authors = ["Ryan Dahl <ry@tinyclouds.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+deno = "0.19.0"
+
+[dev-dependencies]
+deno_typescript = "0.19.0"
diff --git a/op_hello/src/hello.ts b/op_hello/src/hello.ts
new file mode 100644
index 00000000000000..8269506165cabc
--- /dev/null
+++ b/op_hello/src/hello.ts
@@ -0,0 +1,5 @@
+const OP_HELLO = Deno.ops.add("hello");
+
+export function hello() {
+  Deno.send(OP_HELLO);
+}
diff --git a/op_hello/src/lib.rs b/op_hello/src/lib.rs
new file mode 100644
index 00000000000000..12fd6e5da0561a
--- /dev/null
+++ b/op_hello/src/lib.rs
@@ -0,0 +1,24 @@
+extern crate deno;
+use deno::*;
+
+pub fn init(&mut isolate: Isolate) {
+  isolate.register_op("hello", op_hello);
+}
+
+fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
+  println!("Hello world");
+  CoreOp::Sync(Box::new([]))
+}
+
+#[test]
+fn basic_test() {
+  match op_hello() {
+    CoreOp::Sync(buf) => {
+      assert_eq!(buf.len(), 0);
+    }
+    CoreOp::Async(_) => {
+      unreachable!()
+    }
+  }
+}
+

From 404892cf5e64a2444c89816e63226aaba54d03db Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 00:18:31 -0400
Subject: [PATCH 02/12] WIP

---
 op_hello/src/hello_test.ts | 10 ++++++++++
 op_hello/src/lib.rs        | 16 +++++++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 op_hello/src/hello_test.ts

diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
new file mode 100644
index 00000000000000..8b393fa25077f3
--- /dev/null
+++ b/op_hello/src/hello_test.ts
@@ -0,0 +1,10 @@
+// TODO here we're referencing files accross crate boundaries, which has two
+// problems:
+// 1. "cargo package" breaks when you do this.
+// 2. Using this crate outside of the deno tree becomes impossible.
+import { test, assert } from "./src/js/test_util.ts";
+import { hello } from "./hello.ts";
+
+test(function testHello(): void {
+  hello();
+});
diff --git a/op_hello/src/lib.rs b/op_hello/src/lib.rs
index 12fd6e5da0561a..d87b98a29e052c 100644
--- a/op_hello/src/lib.rs
+++ b/op_hello/src/lib.rs
@@ -1,8 +1,11 @@
 extern crate deno;
 use deno::*;
 
-pub fn init(&mut isolate: Isolate) {
+pub fn init(&mut isolate: Isolate) -> Result<(), ErrBox> {
   isolate.register_op("hello", op_hello);
+
+  // TODO Somehow define register_deno_global
+  isolate.register_deno_global("src/hello.ts", "hello")
 }
 
 fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
@@ -11,14 +14,17 @@ fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
 }
 
 #[test]
-fn basic_test() {
+fn hello_rust() {
   match op_hello() {
     CoreOp::Sync(buf) => {
       assert_eq!(buf.len(), 0);
     }
-    CoreOp::Async(_) => {
-      unreachable!()
-    }
+    CoreOp::Async(_) => unreachable!(),
   }
 }
 
+#[test]
+fn hello_js() {
+  // TODO need to define run_js_test somehow...
+  run_js_test("src/hello_test.ts");
+}

From 2c203d7addd542d102531d001cae321bd26ce8d5 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 00:25:08 -0400
Subject: [PATCH 03/12] wip

---
 op_hello/src/hello_test.ts | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
index 8b393fa25077f3..dc422edfaceaee 100644
--- a/op_hello/src/hello_test.ts
+++ b/op_hello/src/hello_test.ts
@@ -1,8 +1,18 @@
-// TODO here we're referencing files accross crate boundaries, which has two
-// problems:
-// 1. "cargo package" breaks when you do this.
-// 2. Using this crate outside of the deno tree becomes impossible.
-import { test, assert } from "./src/js/test_util.ts";
+// TODO  We need some way to import test modules.
+// Attempt one:
+//
+//   import { test, assert } from "../../js/test_util.ts";
+//
+// Here it is referencing files across crate boundaries, which will break
+// 'cargo package' and means the crate is not useable outside the deno tree.
+// This might be okay for a first pass, but it's not the best solution.
+//
+// Attempt two:
+// we invent a new URL for referencing files in other crates.
+// this is magic and not browser compatible.. Browser compatibility for
+// ops is not so important.
+import { test, assert } from "crate://deno_cli_snapshots@0.19.0/test_util.ts";
+
 import { hello } from "./hello.ts";
 
 test(function testHello(): void {

From ce4ae67cc5b739250b3fd190d84a8a2e84e91a2d Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 00:34:06 -0400
Subject: [PATCH 04/12] wip

---
 op_hello/Cargo.toml        | 5 +----
 op_hello/src/hello_test.ts | 7 +++----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/op_hello/Cargo.toml b/op_hello/Cargo.toml
index 68313b5e03ace6..0460193cb1dd81 100644
--- a/op_hello/Cargo.toml
+++ b/op_hello/Cargo.toml
@@ -4,10 +4,7 @@ version = "0.1.0"
 authors = ["Ryan Dahl <ry@tinyclouds.org>"]
 edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 deno = "0.19.0"
+deno_std = "0.19.0" # TODO deno_std is not yet published as crate
 
-[dev-dependencies]
-deno_typescript = "0.19.0"
diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
index dc422edfaceaee..71c2fe477379d3 100644
--- a/op_hello/src/hello_test.ts
+++ b/op_hello/src/hello_test.ts
@@ -1,7 +1,7 @@
 // TODO  We need some way to import test modules.
 // Attempt one:
 //
-//   import { test, assert } from "../../js/test_util.ts";
+//   import { test } from "../../js/test_util.ts";
 //
 // Here it is referencing files across crate boundaries, which will break
 // 'cargo package' and means the crate is not useable outside the deno tree.
@@ -11,10 +11,9 @@
 // we invent a new URL for referencing files in other crates.
 // this is magic and not browser compatible.. Browser compatibility for
 // ops is not so important.
-import { test, assert } from "crate://deno_cli_snapshots@0.19.0/test_util.ts";
-
+import { test } from "crate://deno_std@0.19.0/testing/mod.ts";
 import { hello } from "./hello.ts";
 
-test(function testHello(): void {
+test("hello test", () => {
   hello();
 });

From 834a2b9feb808e69f345b1bbce52b294148dcef7 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 01:52:30 -0400
Subject: [PATCH 05/12] x

---
 op_hello/Cargo.toml        | 11 ++++++++++-
 op_hello/src/hello.ts      | 15 +++++++++++----
 op_hello/src/hello_test.ts | 10 ++++++++--
 op_hello/src/lib.rs        | 20 +++++++++++++++-----
 4 files changed, 44 insertions(+), 12 deletions(-)

diff --git a/op_hello/Cargo.toml b/op_hello/Cargo.toml
index 0460193cb1dd81..61c6d2c0e22375 100644
--- a/op_hello/Cargo.toml
+++ b/op_hello/Cargo.toml
@@ -1,10 +1,19 @@
+# This is an imagined crate directory structure for Deno ops.
+
 [package]
 name = "op_hello"
 version = "0.1.0"
 authors = ["Ryan Dahl <ry@tinyclouds.org>"]
 edition = "2018"
 
+# Note: I am explicitly attempting to not have a build.rs file. I think it might
+# be unnecessary for each op crate to implement their own. Then again, it might
+# be unavoidable... Let's try without first.
+
 [dependencies]
 deno = "0.19.0"
-deno_std = "0.19.0" # TODO deno_std is not yet published as crate
+# deno_std is needed because hello_test.ts depends on the "testing/mod.ts" file
+# inside of deno_std.
+# TODO deno_std is not yet published as crate
+deno_std = "0.19.0"
 
diff --git a/op_hello/src/hello.ts b/op_hello/src/hello.ts
index 8269506165cabc..840d7a3fccd38c 100644
--- a/op_hello/src/hello.ts
+++ b/op_hello/src/hello.ts
@@ -1,5 +1,12 @@
-const OP_HELLO = Deno.ops.add("hello");
+const OP_HELLO: number = Deno.ops.add("hello");
 
-export function hello() {
-  Deno.send(OP_HELLO);
-}
+/**
+ * The typedoc here ideally would be presevered automatically in
+ * lib.deno_runtime.d.ts
+ * Potentially by using this new method of defining functions on Deno, the d.ts
+ * file generated by typescript will be nicer. If not, we will keep maintaining
+ * lib.deno_runtime.d.ts by hand until we automate a solution.
+ */
+Deno.hello = () => {
+  Deno.core.send(OP_HELLO);
+};
diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
index 71c2fe477379d3..a3ee3b5186c126 100644
--- a/op_hello/src/hello_test.ts
+++ b/op_hello/src/hello_test.ts
@@ -1,4 +1,4 @@
-// TODO  We need some way to import test modules.
+// We need some way to import test modules.
 // Attempt one:
 //
 //   import { test } from "../../js/test_util.ts";
@@ -11,7 +11,13 @@
 // we invent a new URL for referencing files in other crates.
 // this is magic and not browser compatible.. Browser compatibility for
 // ops is not so important.
-import { test } from "crate://deno_std@0.19.0/testing/mod.ts";
+//
+//  import { test } from "crate://deno_std@0.19.0/testing/mod.ts";
+//
+// This is quite nice. But the version of deno_std already specified in
+// Cargo.toml. I think we shouldn't repeat it.
+import { test } from "crate://deno_std/testing/mod.ts";
+
 import { hello } from "./hello.ts";
 
 test("hello test", () => {
diff --git a/op_hello/src/lib.rs b/op_hello/src/lib.rs
index d87b98a29e052c..3eb873e178fbaf 100644
--- a/op_hello/src/lib.rs
+++ b/op_hello/src/lib.rs
@@ -1,11 +1,22 @@
 extern crate deno;
+extern crate deno_std;
 use deno::*;
 
 pub fn init(&mut isolate: Isolate) -> Result<(), ErrBox> {
-  isolate.register_op("hello", op_hello);
+  isolate.register_op("hello", op_hello); // register_op defined by #3002
 
-  // TODO Somehow define register_deno_global
-  isolate.register_deno_global("src/hello.ts", "hello")
+  // Explicitly link the deno_std crate so it can be used in hello_test.ts
+  // Its usage looks like this:
+  //
+  //   import { test } from "crate://deno_std/testing/mod.ts";
+  //
+  // In the future it might make sense to automate this function away, but I think
+  // it would be prudent to make the crate URL resolution as obvious as
+  // possible.
+  isolate.register_crate_url("deno_std", deno_std::get_file);
+
+  // TODO The ability to run typescript doesn't exist in deno core.
+  isolate.run("src/hello.ts")
 }
 
 fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
@@ -25,6 +36,5 @@ fn hello_rust() {
 
 #[test]
 fn hello_js() {
-  // TODO need to define run_js_test somehow...
-  run_js_test("src/hello_test.ts");
+  deno_test("src/hello_test.ts"); // TODO implement deno_test
 }

From 775f56a2060b7f0e5de0a756bb32808d36c973bd Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 01:55:10 -0400
Subject: [PATCH 06/12] x

---
 op_hello/src/hello_test.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
index a3ee3b5186c126..75566fa9978e75 100644
--- a/op_hello/src/hello_test.ts
+++ b/op_hello/src/hello_test.ts
@@ -18,8 +18,8 @@
 // Cargo.toml. I think we shouldn't repeat it.
 import { test } from "crate://deno_std/testing/mod.ts";
 
-import { hello } from "./hello.ts";
+import "./hello.ts";
 
 test("hello test", () => {
-  hello();
+  Deno.hello();
 });

From e9e0e80e154998c7df9da278498b13e2d3a882fd Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 02:25:32 -0400
Subject: [PATCH 07/12] Maybe we can use split file namespaces

---
 op_hello/src/hello.ts | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/op_hello/src/hello.ts b/op_hello/src/hello.ts
index 840d7a3fccd38c..ab4ca02f69a218 100644
--- a/op_hello/src/hello.ts
+++ b/op_hello/src/hello.ts
@@ -1,12 +1,12 @@
 const OP_HELLO: number = Deno.ops.add("hello");
 
-/**
- * The typedoc here ideally would be presevered automatically in
- * lib.deno_runtime.d.ts
- * Potentially by using this new method of defining functions on Deno, the d.ts
- * file generated by typescript will be nicer. If not, we will keep maintaining
- * lib.deno_runtime.d.ts by hand until we automate a solution.
- */
-Deno.hello = () => {
-  Deno.core.send(OP_HELLO);
-};
+// https://www.typescriptlang.org/docs/handbook/namespaces.html#splitting-across-files
+namespace Deno {
+  /**
+   * The typedoc here ideally would be presevered automatically in
+   * lib.deno_runtime.d.ts
+   */
+  export function hello() {
+    Deno.core.send(OP_HELLO);
+  }
+}

From 21aa00a0a22eb4fd41cc023467221e0670d04ac7 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 02:45:35 -0400
Subject: [PATCH 08/12] elegant url

---
 op_hello/src/hello_test.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/op_hello/src/hello_test.ts b/op_hello/src/hello_test.ts
index 75566fa9978e75..913568f73c6599 100644
--- a/op_hello/src/hello_test.ts
+++ b/op_hello/src/hello_test.ts
@@ -18,8 +18,17 @@
 // Cargo.toml. I think we shouldn't repeat it.
 import { test } from "crate://deno_std/testing/mod.ts";
 
+// If we don't do the //src reorg that I've proposed in #3022, then we might be
+// able to have a very elegant URL some day using the deno crate.
+//
+//  import { test } from "crate://deno/std/testing/mod.ts";
+
 import "./hello.ts";
 
 test("hello test", () => {
   Deno.hello();
 });
+
+test("hello test2", () => {
+  Deno.hello();
+});

From d8c20c0ec66953b2f8b4a8bd22ac3da3b2c7ef3b Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 02:50:46 -0400
Subject: [PATCH 09/12] x

---
 op_hello/src/lib.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/op_hello/src/lib.rs b/op_hello/src/lib.rs
index 3eb873e178fbaf..5d4ef2df8f9aeb 100644
--- a/op_hello/src/lib.rs
+++ b/op_hello/src/lib.rs
@@ -25,7 +25,7 @@ fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
 }
 
 #[test]
-fn hello_rust() {
+fn rust_test() {
   match op_hello() {
     CoreOp::Sync(buf) => {
       assert_eq!(buf.len(), 0);
@@ -35,6 +35,7 @@ fn hello_rust() {
 }
 
 #[test]
-fn hello_js() {
-  deno_test("src/hello_test.ts"); // TODO implement deno_test
+fn js_test() {
+  // This should execute src/hello_test.ts
+  deno_test();
 }

From 607aeaec29de4967a2dda57bd14fe628e0414dc5 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 03:09:31 -0400
Subject: [PATCH 10/12] Add op_hello_js

---
 op_hello_js/Cargo.toml        | 15 +++++++++++++++
 op_hello_js/src/hello.js      |  5 +++++
 op_hello_js/src/hello_test.js |  4 ++++
 op_hello_js/src/lib.rs        | 29 +++++++++++++++++++++++++++++
 4 files changed, 53 insertions(+)
 create mode 100644 op_hello_js/Cargo.toml
 create mode 100644 op_hello_js/src/hello.js
 create mode 100644 op_hello_js/src/hello_test.js
 create mode 100644 op_hello_js/src/lib.rs

diff --git a/op_hello_js/Cargo.toml b/op_hello_js/Cargo.toml
new file mode 100644
index 00000000000000..80502df3ab90bf
--- /dev/null
+++ b/op_hello_js/Cargo.toml
@@ -0,0 +1,15 @@
+# This is an imagined crate directory structure for Deno ops.
+# Same as op_hello but done with JS and not TS.
+
+[package]
+name = "op_hello_js"
+version = "0.1.0"
+authors = ["Ryan Dahl <ry@tinyclouds.org>"]
+edition = "2018"
+
+# Note: I am explicitly attempting to not have a build.rs file. I think it might
+# be unnecessary for each op crate to implement their own. Then again, it might
+# be unavoidable... Let's try without first.
+
+[dependencies]
+deno = "0.19.0"
diff --git a/op_hello_js/src/hello.js b/op_hello_js/src/hello.js
new file mode 100644
index 00000000000000..896d1862ec6ff9
--- /dev/null
+++ b/op_hello_js/src/hello.js
@@ -0,0 +1,5 @@
+const OP_HELLO = Deno.ops.add("hello");
+
+export function hello() {
+  Deno.core.send(OP_HELLO);
+}
diff --git a/op_hello_js/src/hello_test.js b/op_hello_js/src/hello_test.js
new file mode 100644
index 00000000000000..5fd5d0c050319e
--- /dev/null
+++ b/op_hello_js/src/hello_test.js
@@ -0,0 +1,4 @@
+// As opposed to the TypeScript op_hello example, here we want to not rely on 
+// deno_std, as it uses TypeScript. So here don't use a test runner.
+import { hello } from "./hello.js";
+hello();
diff --git a/op_hello_js/src/lib.rs b/op_hello_js/src/lib.rs
new file mode 100644
index 00000000000000..811da8004f5153
--- /dev/null
+++ b/op_hello_js/src/lib.rs
@@ -0,0 +1,29 @@
+extern crate deno;
+extern crate deno_std;
+use deno::*;
+
+pub fn init(&mut isolate: Isolate) -> Result<(), ErrBox> {
+  isolate.register_op("hello", op_hello); // register_op defined by #3002
+
+  isolate.execute("src/hello.js")
+}
+
+fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
+  println!("Hello world");
+  CoreOp::Sync(Box::new([]))
+}
+
+#[test]
+fn rust_test() {
+  match op_hello() {
+    CoreOp::Sync(buf) => {
+      assert_eq!(buf.len(), 0);
+    }
+    CoreOp::Async(_) => unreachable!(),
+  }
+}
+
+#[test]
+fn js_test() {
+  isolate.execute("src/hello_test.js")
+}

From f6f169d8aa68ebc197532ce92b725f39c7f102ef Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 05:44:37 -0400
Subject: [PATCH 11/12] simplify

---
 op_hello_js/Cargo.toml              |  5 ++---
 op_hello_js/{src => }/hello.js      |  0
 op_hello_js/{src => }/hello_test.js |  0
 op_hello_js/{src => }/lib.rs        | 22 ++++++++++------------
 4 files changed, 12 insertions(+), 15 deletions(-)
 rename op_hello_js/{src => }/hello.js (100%)
 rename op_hello_js/{src => }/hello_test.js (100%)
 rename op_hello_js/{src => }/lib.rs (62%)

diff --git a/op_hello_js/Cargo.toml b/op_hello_js/Cargo.toml
index 80502df3ab90bf..5e6e44946ffa8b 100644
--- a/op_hello_js/Cargo.toml
+++ b/op_hello_js/Cargo.toml
@@ -7,9 +7,8 @@ version = "0.1.0"
 authors = ["Ryan Dahl <ry@tinyclouds.org>"]
 edition = "2018"
 
-# Note: I am explicitly attempting to not have a build.rs file. I think it might
-# be unnecessary for each op crate to implement their own. Then again, it might
-# be unavoidable... Let's try without first.
+[lib]
+path = "lib.rs"
 
 [dependencies]
 deno = "0.19.0"
diff --git a/op_hello_js/src/hello.js b/op_hello_js/hello.js
similarity index 100%
rename from op_hello_js/src/hello.js
rename to op_hello_js/hello.js
diff --git a/op_hello_js/src/hello_test.js b/op_hello_js/hello_test.js
similarity index 100%
rename from op_hello_js/src/hello_test.js
rename to op_hello_js/hello_test.js
diff --git a/op_hello_js/src/lib.rs b/op_hello_js/lib.rs
similarity index 62%
rename from op_hello_js/src/lib.rs
rename to op_hello_js/lib.rs
index 811da8004f5153..ecd98b15a40694 100644
--- a/op_hello_js/src/lib.rs
+++ b/op_hello_js/lib.rs
@@ -1,11 +1,10 @@
 extern crate deno;
-extern crate deno_std;
 use deno::*;
 
 pub fn init(&mut isolate: Isolate) -> Result<(), ErrBox> {
   isolate.register_op("hello", op_hello); // register_op defined by #3002
-
-  isolate.execute("src/hello.js")
+  isolate.execute("hello.js")?;
+  Ok(())
 }
 
 fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
@@ -14,16 +13,15 @@ fn op_hello(_control_buf: &[u8], _zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
 }
 
 #[test]
-fn rust_test() {
-  match op_hello() {
-    CoreOp::Sync(buf) => {
-      assert_eq!(buf.len(), 0);
-    }
-    CoreOp::Async(_) => unreachable!(),
-  }
+fn js_test() {
+  isolate.execute("hello_test.js")
 }
 
 #[test]
-fn js_test() {
-  isolate.execute("src/hello_test.js")
+fn rust_test() {
+  if let CoreOp::Sync(buf) = op_hello() {
+    assert_eq!(buf.len(), 0);
+  } else {
+    unreachable!();
+  }
 }

From b04616a1d17ffd4f8f4ff4540f56e942382e3a26 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 26 Sep 2019 05:52:27 -0400
Subject: [PATCH 12/12] adjust

---
 op_hello_js/hello.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/op_hello_js/hello.js b/op_hello_js/hello.js
index 896d1862ec6ff9..7cfdaa82b871f3 100644
--- a/op_hello_js/hello.js
+++ b/op_hello_js/hello.js
@@ -1,5 +1,6 @@
-const OP_HELLO = Deno.ops.add("hello");
+// TODO In the future maybe we can extract the op id in the top-level and use a
+// constant. But currently it's causing problems with snapshotting.
 
 export function hello() {
-  Deno.core.send(OP_HELLO);
+  Deno.core.send(Deno.ops["hello"]);
 }