fix: Avoid meaningless replacing by octet-stream.

test/integration/Conversion.test.ts

@@ -24,6 +24,45 @@ describe('Representation conversion', (): void => {
     await app.stop();
   });
 
+  describe('a Turtle document', (): void => {
+    const turtleUrl = `${baseUrl}turtle`;
+    const turtleBody = '# Test';
+
+    beforeAll(async(): Promise<void> => {
+      const res = await fetch(turtleUrl, {
+        method: 'PUT',
+        headers: { 'content-type': 'text/turtle' },
+        body: turtleBody,
+      });
+      assert.equal(res.status, 201);
+    });
+
+    it('is sent as text/turtle when no preference is given.', async(): Promise<void> => {
+      const res = await fetch(turtleUrl);
+      expect(res.status).toBe(200);
+      expect(res.headers.get('Content-Type')).toBe('text/turtle');
+      expect(await res.text()).toBe(turtleBody);
+    });
+
+    it('is sent as text/turtle when accepting */*.', async(): Promise<void> => {
+      const res = await fetch(turtleUrl, {
+        headers: { accept: '*/*' },
+      });
+      expect(res.status).toBe(200);
+      expect(res.headers.get('Content-Type')).toBe('text/turtle');
+      expect(await res.text()).toBe(turtleBody);
+    });
+
+    it('can be sent as application/octet-stream if that is the only option.', async(): Promise<void> => {
+      const res = await fetch(turtleUrl, {
+        headers: { accept: 'application/octet-stream' },
+      });
+      expect(res.status).toBe(200);
+      expect(res.headers.get('Content-Type')).toBe('application/octet-stream');
+      expect(await res.text()).toBe(turtleBody);
+    });
+  });
+
   describe('a Markdown document', (): void => {
     const markdownUrl = `${baseUrl}document`;
     const markdownBody = '# Test';