diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.java b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.java
deleted file mode 100644
index 63612bc66d5..00000000000
--- a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.java
+++ /dev/null
@@ -1,151 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-package com.facebook.react.devsupport;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-import java.io.IOException;
-import java.util.Map;
-import okio.Buffer;
-import okio.ByteString;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.robolectric.RobolectricTestRunner;
-
-@RunWith(RobolectricTestRunner.class)
-public class MultipartStreamReaderTest {
-
-  class CallCountTrackingChunkCallback implements MultipartStreamReader.ChunkListener {
-    private int mCount = 0;
-
-    @Override
-    public void onChunkComplete(Map<String, String> headers, Buffer body, boolean done)
-        throws IOException {
-      mCount++;
-    }
-
-    @Override
-    public void onChunkProgress(Map<String, String> headers, long loaded, long total)
-        throws IOException {}
-
-    public int getCallCount() {
-      return mCount;
-    }
-  }
-
-  @Test
-  public void testSimpleCase() throws IOException {
-    ByteString response =
-        ByteString.encodeUtf8(
-            "preable, should be ignored\r\n"
-                + "--sample_boundary\r\n"
-                + "Content-Type: application/json; charset=utf-8\r\n"
-                + "Content-Length: 2\r\n\r\n"
-                + "{}\r\n"
-                + "--sample_boundary--\r\n"
-                + "epilogue, should be ignored");
-
-    Buffer source = new Buffer();
-    source.write(response);
-
-    MultipartStreamReader reader = new MultipartStreamReader(source, "sample_boundary");
-
-    CallCountTrackingChunkCallback callback =
-        new CallCountTrackingChunkCallback() {
-          @Override
-          public void onChunkComplete(Map<String, String> headers, Buffer body, boolean done)
-              throws IOException {
-            super.onChunkComplete(headers, body, done);
-
-            assertThat(done).isTrue();
-            assertThat(headers.get("Content-Type")).isEqualTo("application/json; charset=utf-8");
-            assertThat(body.readUtf8()).isEqualTo("{}");
-          }
-        };
-    boolean success = reader.readAllParts(callback);
-
-    assertThat(callback.getCallCount()).isEqualTo(1);
-    assertThat(success).isTrue();
-  }
-
-  @Test
-  public void testMultipleParts() throws IOException {
-    ByteString response =
-        ByteString.encodeUtf8(
-            "preable, should be ignored\r\n"
-                + "--sample_boundary\r\n"
-                + "1\r\n"
-                + "--sample_boundary\r\n"
-                + "2\r\n"
-                + "--sample_boundary\r\n"
-                + "3\r\n"
-                + "--sample_boundary--\r\n"
-                + "epilogue, should be ignored");
-
-    Buffer source = new Buffer();
-    source.write(response);
-
-    MultipartStreamReader reader = new MultipartStreamReader(source, "sample_boundary");
-
-    CallCountTrackingChunkCallback callback =
-        new CallCountTrackingChunkCallback() {
-          @Override
-          public void onChunkComplete(Map<String, String> headers, Buffer body, boolean done)
-              throws IOException {
-            super.onChunkComplete(headers, body, done);
-
-            assertThat(done).isEqualTo(getCallCount() == 3);
-            assertThat(body.readUtf8()).isEqualTo(String.valueOf(getCallCount()));
-          }
-        };
-    boolean success = reader.readAllParts(callback);
-
-    assertThat(callback.getCallCount()).isEqualTo(3);
-    assertThat(success).isTrue();
-  }
-
-  @Test
-  public void testNoDelimiter() throws IOException {
-    ByteString response = ByteString.encodeUtf8("Yolo");
-
-    Buffer source = new Buffer();
-    source.write(response);
-
-    MultipartStreamReader reader = new MultipartStreamReader(source, "sample_boundary");
-
-    CallCountTrackingChunkCallback callback = new CallCountTrackingChunkCallback();
-    boolean success = reader.readAllParts(callback);
-
-    assertThat(callback.getCallCount()).isEqualTo(0);
-    assertThat(success).isFalse();
-  }
-
-  @Test
-  public void testNoCloseDelimiter() throws IOException {
-    ByteString response =
-        ByteString.encodeUtf8(
-            "preable, should be ignored\r\n"
-                + "--sample_boundary\r\n"
-                + "Content-Type: application/json; charset=utf-8\r\n"
-                + "Content-Length: 2\r\n\r\n"
-                + "{}\r\n"
-                + "--sample_boundary\r\n"
-                + "incomplete message...");
-
-    Buffer source = new Buffer();
-    source.write(response);
-
-    MultipartStreamReader reader = new MultipartStreamReader(source, "sample_boundary");
-
-    CallCountTrackingChunkCallback callback = new CallCountTrackingChunkCallback();
-    boolean success = reader.readAllParts(callback);
-
-    assertThat(callback.getCallCount()).isEqualTo(1);
-    assertThat(success).isFalse();
-  }
-}
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.kt
new file mode 100644
index 00000000000..87e37867cf7
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/devsupport/MultipartStreamReaderTest.kt
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.devsupport
+
+import okio.Buffer
+import okio.ByteString
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+
+@RunWith(RobolectricTestRunner::class)
+class MultipartStreamReaderTest {
+
+  @Test
+  fun testSimpleCase() {
+    val response: ByteString =
+        encodeUtf8(
+            "preamble, should be ignored\r\n" +
+                "--sample_boundary\r\n" +
+                "Content-Type: application/json; charset=utf-8\r\n" +
+                "Content-Length: 2\r\n\r\n" +
+                "{}\r\n" +
+                "--sample_boundary--\r\n" +
+                "epilogue, should be ignored")
+
+    val source = Buffer()
+    source.write(response)
+
+    val reader = MultipartStreamReader(source, "sample_boundary")
+
+    val callback: CallCountTrackingChunkCallback =
+        object : CallCountTrackingChunkCallback() {
+          override fun onChunkComplete(headers: Map<String, String>?, body: Buffer, done: Boolean) {
+            super.onChunkComplete(headers, body, done)
+
+            assertThat(done).isTrue
+            assertThat(headers!!["Content-Type"]).isEqualTo("application/json; charset=utf-8")
+            assertThat(body.readUtf8()).isEqualTo("{}")
+          }
+        }
+    val success = reader.readAllParts(callback)
+
+    assertThat(callback.callCount).isEqualTo(1)
+    assertThat(success).isTrue
+  }
+
+  @Test
+  fun testMultipleParts() {
+    val response: ByteString =
+        encodeUtf8(
+            "preamble, should be ignored\r\n" +
+                "--sample_boundary\r\n" +
+                "1\r\n" +
+                "--sample_boundary\r\n" +
+                "2\r\n" +
+                "--sample_boundary\r\n" +
+                "3\r\n" +
+                "--sample_boundary--\r\n" +
+                "epilogue, should be ignored")
+
+    val source = Buffer()
+    source.write(response)
+
+    val reader = MultipartStreamReader(source, "sample_boundary")
+
+    val callback: CallCountTrackingChunkCallback =
+        object : CallCountTrackingChunkCallback() {
+          override fun onChunkComplete(headers: Map<String, String>?, body: Buffer, done: Boolean) {
+            super.onChunkComplete(headers, body, done)
+
+            assertThat(done).isEqualTo(callCount == 3)
+            assertThat(body.readUtf8()).isEqualTo("$callCount")
+          }
+        }
+    val success = reader.readAllParts(callback)
+
+    assertThat(callback.callCount).isEqualTo(3)
+    assertThat(success).isTrue
+  }
+
+  @Test
+  fun testNoDelimiter() {
+    val response: ByteString = encodeUtf8("Yolo")
+
+    val source = Buffer()
+    source.write(response)
+
+    val reader = MultipartStreamReader(source, "sample_boundary")
+
+    val callback = CallCountTrackingChunkCallback()
+    val success = reader.readAllParts(callback)
+
+    assertThat(callback.callCount).isEqualTo(0)
+    assertThat(success).isFalse
+  }
+
+  @Test
+  fun testNoCloseDelimiter() {
+    val response: ByteString =
+        encodeUtf8(
+            "preamble, should be ignored\r\n" +
+                "--sample_boundary\r\n" +
+                "Content-Type: application/json; charset=utf-8\r\n" +
+                "Content-Length: 2\r\n\r\n" +
+                "{}\r\n" +
+                "--sample_boundary\r\n" +
+                "incomplete message...")
+
+    val source = Buffer()
+    source.write(response)
+
+    val reader = MultipartStreamReader(source, "sample_boundary")
+
+    val callback = CallCountTrackingChunkCallback()
+    val success = reader.readAllParts(callback)
+
+    assertThat(callback.callCount).isEqualTo(1)
+    assertThat(success).isFalse
+  }
+
+  internal open class CallCountTrackingChunkCallback : MultipartStreamReader.ChunkListener {
+    var callCount = 0
+      private set
+
+    override fun onChunkComplete(headers: Map<String, String>?, body: Buffer, done: Boolean) {
+      callCount++
+    }
+
+    override fun onChunkProgress(headers: Map<String, String>, loaded: Long, total: Long) {}
+  }
+
+  private fun encodeUtf8(input: String): ByteString =
+      ByteString.of(*input.toByteArray(Charsets.UTF_8))
+}