diff --git a/test/unit/fetch_stream_spec.js b/test/unit/fetch_stream_spec.js
new file mode 100644
index 000000000..88baba067
--- /dev/null
+++ b/test/unit/fetch_stream_spec.js
@@ -0,0 +1,108 @@
+/* Copyright 2019 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* eslint no-var: error */
+
+import { PDFFetchStream } from '../../src/display/fetch_stream';
+
+describe('fetch_stream', function() {
+  const pdfUrl = new URL('../pdfs/tracemonkey.pdf', window.location).href;
+  const pdfLength = 1016315;
+
+  it('read with streaming', function(done) {
+    const stream = new PDFFetchStream({
+      url: pdfUrl,
+      disableStream: false,
+      disableRange: true,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported;
+    const promise = fullReader.headersReady.then(function() {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+    });
+
+    let len = 0;
+    const read = function() {
+      return fullReader.read().then(function(result) {
+        if (result.done) {
+          return;
+        }
+
+        len += result.value.byteLength;
+        return read();
+      });
+    };
+
+    const readPromise = Promise.all([read(), promise]);
+    readPromise.then(function() {
+      expect(len).toEqual(pdfLength);
+      expect(isStreamingSupported).toEqual(true);
+      expect(isRangeSupported).toEqual(false);
+      done();
+    }).catch(done.fail);
+  });
+
+  it('read ranges with streaming', function(done) {
+    const rangeSize = 32768;
+    const stream = new PDFFetchStream({
+      url: pdfUrl,
+      rangeChunkSize: rangeSize,
+      disableStream: false,
+      disableRange: false,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported, fullReaderCancelled;
+    const promise = fullReader.headersReady.then(function() {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+      // We shall be able to close full reader without any issue.
+      fullReader.cancel(new Error('Don\'t need full reader'));
+      fullReaderCancelled = true;
+    });
+
+    const tailSize = (pdfLength % rangeSize) || rangeSize;
+    const rangeReader1 = stream.getRangeReader(pdfLength - tailSize - rangeSize,
+                                               pdfLength - tailSize);
+    const rangeReader2 = stream.getRangeReader(pdfLength - tailSize, pdfLength);
+
+    let result1 = { value: 0, }, result2 = { value: 0, };
+    const read = function(reader, lenResult) {
+      return reader.read().then(function(result) {
+        if (result.done) {
+          return;
+        }
+
+        lenResult.value += result.value.byteLength;
+        return read(reader, lenResult);
+      });
+    };
+
+    const readPromise = Promise.all([read(rangeReader1, result1),
+                                     read(rangeReader2, result2),
+                                     promise]);
+    readPromise.then(function() {
+      expect(isStreamingSupported).toEqual(true);
+      expect(isRangeSupported).toEqual(true);
+      expect(fullReaderCancelled).toEqual(true);
+      expect(result1.value).toEqual(rangeSize);
+      expect(result2.value).toEqual(tailSize);
+      done();
+    }).catch(done.fail);
+  });
+});
diff --git a/test/unit/jasmine-boot.js b/test/unit/jasmine-boot.js
index d0e5e5800..df1abcff8 100644
--- a/test/unit/jasmine-boot.js
+++ b/test/unit/jasmine-boot.js
@@ -62,6 +62,7 @@ function initializePDFJS(callback) {
     'pdfjs-test/unit/encodings_spec',
     'pdfjs-test/unit/evaluator_spec',
     'pdfjs-test/unit/function_spec',
+    'pdfjs-test/unit/fetch_stream_spec',
     'pdfjs-test/unit/message_handler_spec',
     'pdfjs-test/unit/metadata_spec',
     'pdfjs-test/unit/murmurhash3_spec',