diff --git a/cli/tests/unit/command_test.ts b/cli/tests/unit/command_test.ts
index 1c707651c5..cbb1c4921c 100644
--- a/cli/tests/unit/command_test.ts
+++ b/cli/tests/unit/command_test.ts
@@ -208,8 +208,7 @@ Deno.test(
   async function commandRedirectStdin() {
     const tempDir = await Deno.makeTempDir();
     const fileName = tempDir + "/redirected_stdio.txt";
-    const encoder = new TextEncoder();
-    await Deno.writeFile(fileName, encoder.encode("hello"));
+    await Deno.writeTextFile(fileName, "hello");
     const file = await Deno.open(fileName);
 
     const command = new Deno.Command(Deno.execPath(), {
diff --git a/cli/tests/unit/process_test.ts b/cli/tests/unit/process_test.ts
index f6ad2a5cd6..cb5dd08154 100644
--- a/cli/tests/unit/process_test.ts
+++ b/cli/tests/unit/process_test.ts
@@ -395,8 +395,7 @@ Deno.test(
   async function runRedirectStdin() {
     const tempDir = await Deno.makeTempDir();
     const fileName = tempDir + "/redirected_stdio.txt";
-    const encoder = new TextEncoder();
-    await Deno.writeFile(fileName, encoder.encode("hello"));
+    await Deno.writeTextFile(fileName, "hello");
     const file = await Deno.open(fileName);
 
     // deno-lint-ignore no-deprecated-deno-api
diff --git a/cli/tests/unit_node/_fs/_fs_ftruncate_test.ts b/cli/tests/unit_node/_fs/_fs_ftruncate_test.ts
index a843b19b74..4c2c347892 100644
--- a/cli/tests/unit_node/_fs/_fs_ftruncate_test.ts
+++ b/cli/tests/unit_node/_fs/_fs_ftruncate_test.ts
@@ -24,7 +24,7 @@ Deno.test({
   name: "ASYNC: truncate entire file contents",
   async fn() {
     const file: string = Deno.makeTempFileSync();
-    await Deno.writeFile(file, new TextEncoder().encode("hello world"));
+    await Deno.writeTextFile(file, "hello world");
     const { rid } = await Deno.open(file, {
       read: true,
       write: true,
@@ -57,7 +57,7 @@ Deno.test({
   name: "ASYNC: truncate file to a size of precisely len bytes",
   async fn() {
     const file: string = Deno.makeTempFileSync();
-    await Deno.writeFile(file, new TextEncoder().encode("hello world"));
+    await Deno.writeTextFile(file, "hello world");
     const { rid } = await Deno.open(file, {
       read: true,
       write: true,
diff --git a/cli/tests/unit_node/_fs/_fs_truncate_test.ts b/cli/tests/unit_node/_fs/_fs_truncate_test.ts
index 00e03ab0e1..ff087095be 100644
--- a/cli/tests/unit_node/_fs/_fs_truncate_test.ts
+++ b/cli/tests/unit_node/_fs/_fs_truncate_test.ts
@@ -24,7 +24,7 @@ Deno.test({
   name: "ASYNC: truncate entire file contents",
   async fn() {
     const file: string = Deno.makeTempFileSync();
-    await Deno.writeFile(file, new TextEncoder().encode("hello world"));
+    await Deno.writeTextFile(file, "hello world");
 
     await new Promise<void>((resolve, reject) => {
       truncate(file, (err: Error | null) => {
@@ -49,7 +49,7 @@ Deno.test({
   name: "ASYNC: truncate file to a size of precisely len bytes",
   async fn() {
     const file: string = Deno.makeTempFileSync();
-    await Deno.writeFile(file, new TextEncoder().encode("hello world"));
+    await Deno.writeTextFile(file, "hello world");
 
     await new Promise<void>((resolve, reject) => {
       truncate(file, 3, (err: Error | null) => {
diff --git a/cli/tsc/dts/lib.deno.ns.d.ts b/cli/tsc/dts/lib.deno.ns.d.ts
index 4107e13693..f17f9088dc 100644
--- a/cli/tsc/dts/lib.deno.ns.d.ts
+++ b/cli/tsc/dts/lib.deno.ns.d.ts
@@ -3717,7 +3717,7 @@ declare namespace Deno {
    *
    * ```ts
    * const file = await Deno.makeTempFile();
-   * await Deno.writeFile(file, new TextEncoder().encode("Hello World"));
+   * await Deno.writeTextFile(file, "Hello World");
    * await Deno.truncate(file, 7);
    * const data = await Deno.readFile(file);
    * console.log(new TextDecoder().decode(data));  // "Hello W"