diff --git a/src/manifests/handlers/dash/segment.test.ts b/src/manifests/handlers/dash/segment.test.ts
new file mode 100644
index 0000000..8fb3be1
--- /dev/null
+++ b/src/manifests/handlers/dash/segment.test.ts
@@ -0,0 +1,22 @@
+import dashSegmentHandler from './segment';
+
+describe('dashSegmentHandler', () => {
+  it('handles when a representationId contains underscore', async () => {
+    const result = await dashSegmentHandler({
+      queryStringParameters: {
+        url: 'https://stream.with_underscore.com/live-$RepresentationID$-$Time$.dash'
+      },
+      path: '/segment_82008145102133_audio_track_0_0_nor=128000_128000',
+      requestContext: {
+        elb: { targetGroupArn: '' }
+      },
+      isBase64Encoded: false,
+      httpMethod: 'GET',
+      body: '',
+      headers: {}
+    });
+    expect(result.headers.Location).toBe(
+      'https://stream.with_underscore.com/live-audio_track_0_0_nor=128000_128000-82008145102133.dash'
+    );
+  });
+});