feat(init): Generate main_bench.ts by default (#16786)

This commit changes "deno init" to generate "main_bench.ts" file
which scaffold two example bench cases.

cli/tests/init_tests.rs

@@ -30,6 +30,7 @@ mod init {
     assert_contains!(stderr, "deno run main.ts");
     assert_contains!(stderr, "deno task dev");
     assert_contains!(stderr, "deno test");
+    assert_contains!(stderr, "deno bench");
 
     assert!(cwd.join("deno.jsonc").exists());
 
@@ -60,6 +61,18 @@ mod init {
     assert!(output.status.success());
     let stdout = String::from_utf8(output.stdout).unwrap();
     assert_contains!(stdout, "1 passed");
+
+    let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
+    let output = deno_cmd
+      .current_dir(cwd)
+      .env("NO_COLOR", "1")
+      .arg("bench")
+      .stdout(Stdio::piped())
+      .spawn()
+      .unwrap()
+      .wait_with_output()
+      .unwrap();
+    assert!(output.status.success());
   }
 
   #[test]
@@ -85,6 +98,7 @@ mod init {
     assert_contains!(stderr, "deno run main.ts");
     assert_contains!(stderr, "deno task dev");
     assert_contains!(stderr, "deno test");
+    assert_contains!(stderr, "deno bench");
 
     assert!(cwd.join("my_dir/deno.jsonc").exists());
 
@@ -116,6 +130,19 @@ mod init {
     assert!(output.status.success());
     let stdout = String::from_utf8(output.stdout).unwrap();
     assert_contains!(stdout, "1 passed");
+
+    let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
+    let output = deno_cmd
+      .current_dir(cwd)
+      .env("NO_COLOR", "1")
+      .arg("bench")
+      .arg("my_dir/main_bench.ts")
+      .stdout(Stdio::piped())
+      .spawn()
+      .unwrap()
+      .wait_with_output()
+      .unwrap();
+    assert!(output.status.success());
   }
 
   #[test]
@@ -166,5 +193,17 @@ mod init {
     assert!(output.status.success());
     let stdout = String::from_utf8(output.stdout).unwrap();
     assert_contains!(stdout, "1 passed");
+
+    let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
+    let output = deno_cmd
+      .current_dir(cwd)
+      .env("NO_COLOR", "1")
+      .arg("bench")
+      .stdout(Stdio::piped())
+      .spawn()
+      .unwrap()
+      .wait_with_output()
+      .unwrap();
+    assert!(output.status.success());
   }
 }

cli/tools/init/mod.rs

@@ -40,6 +40,8 @@ pub async fn init_project(init_flags: InitFlags) -> Result<(), AnyError> {
   let main_test_ts = include_str!("./templates/main_test.ts")
     .replace("{CURRENT_STD_URL}", deno_std::CURRENT_STD_URL.as_str());
   create_file(&dir, "main_test.ts", &main_test_ts)?;
+  let main_bench_ts = include_str!("./templates/main_bench.ts");
+  create_file(&dir, "main_bench.ts", main_bench_ts)?;
 
   create_file(&dir, "deno.jsonc", include_str!("./templates/deno.jsonc"))?;
 
@@ -62,5 +64,8 @@ pub async fn init_project(init_flags: InitFlags) -> Result<(), AnyError> {
   info!("");
   info!("  {}", colors::gray("// Run the tests"));
   info!("  deno test");
+  info!("");
+  info!("  {}", colors::gray("// Run the benchmarks"));
+  info!("  deno bench");
   Ok(())
 }

cli/tools/init/templates/main_bench.ts

@@ -0,0 +1,9 @@
+import { add } from "./main.ts";
+
+Deno.bench(function addSmall() {
+  add(1, 2);
+});
+
+Deno.bench(function addBig() {
+  add(2 ** 32, 2 ** 32);
+});