diff --git a/cypress/integration/code-highlighting.spec.js b/cypress/integration/code-highlighting.spec.js
index a2e6c8db..3ffef0a0 100644
--- a/cypress/integration/code-highlighting.spec.js
+++ b/cypress/integration/code-highlighting.spec.js
@@ -1,65 +1,93 @@
 /**
  * Copyright (C) 2019  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
  */
 
 const url = 'browse/origin/https://github.com/memononen/libtess2/content/Source/tess.h';
 const lineStart = 32;
 const lineEnd = 42;
 
 const $ = Cypress.$;
 
 describe('Code highlighting tests', function() {
 
   it('should highlight source code and add line numbers', function() {
     cy.visit(url);
     cy.get('.hljs-ln-numbers').then(lnNumbers => {
       cy.get('.hljs-ln-code').then(lnCode => {
         assert.equal(lnNumbers.length, lnCode.length);
       });
     });
   });
 
   it('should emphasize source code lines based on url fragment', function() {
 
     cy.visit(`${url}/#L${lineStart}-L${lineEnd}`);
     cy.get('.hljs-ln-line').then(lines => {
       for (let line of lines) {
         let lineNumber = parseInt($(line).data('line-number'));
         if (lineNumber >= lineStart && lineNumber <= lineEnd) {
           assert.notEqual($(line).css('background-color'), 'rgba(0, 0, 0, 0)');
         } else {
           assert.equal($(line).css('background-color'), 'rgba(0, 0, 0, 0)');
         }
       }
     });
   });
 
   it('should emphasize a line by clicking on its number', function() {
     cy.visit(url);
     cy.get('.hljs-ln-numbers').then(lnNumbers => {
       let lnNumber = lnNumbers[Math.floor(Math.random() * lnNumbers.length)];
       assert.equal($(lnNumber).css('background-color'), 'rgba(0, 0, 0, 0)');
       let line = parseInt($(lnNumber).data('line-number'));
       cy.get(`.hljs-ln-numbers[data-line-number="${line}"]`)
         .scrollIntoView()
         .click()
         .then(() => {
           assert.notEqual($(lnNumber).css('background-color'), 'rgba(0, 0, 0, 0)');
         });
     });
   });
 
   it('should emphasize a range of lines by clicking on two line numbers and holding shift', function() {
     cy.visit(url);
-    // TODO
+
+    cy.get(`.hljs-ln-numbers[data-line-number="${lineStart}"]`)
+      .scrollIntoView()
+      .click()
+      .get(`body`)
+      .type(`{shift}`, { release: false })
+      .get(`.hljs-ln-numbers[data-line-number="${lineEnd}"]`)
+      .scrollIntoView()
+      .click()
+      .get('.hljs-ln-line')
+      .then(lines => {
+        for (let line of lines) {
+          let lineNumber = parseInt($(line).data('line-number'));
+          if (lineNumber >= lineStart && lineNumber <= lineEnd) {
+            assert.notEqual($(line).css('background-color'), 'rgba(0, 0, 0, 0)');
+          } else {
+            assert.equal($(line).css('background-color'), 'rgba(0, 0, 0, 0)');
+          }
+        }
+      });
   });
 
   it('should remove emphasized lines when clicking anywhere in code', function() {
     cy.visit(`${url}/#L${lineStart}-L${lineEnd}`);
-    // TODO
+
+    cy.get(`.hljs-ln-code[data-line-number="1"]`)
+      .scrollIntoView()
+      .click()
+      .get('.hljs-ln-line')
+      .then(lines => {
+        for (let line of lines) {
+          assert.equal($(line).css('background-color'), 'rgba(0, 0, 0, 0)');
+        }
+      });
   });
 
 });