diff --git a/test/doctool/test-doctool-html.js b/test/doctool/test-doctool-html.js
index 1eb96751cc0adb..a8476b7234c9fa 100644
--- a/test/doctool/test-doctool-html.js
+++ b/test/doctool/test-doctool-html.js
@@ -3,6 +3,7 @@
 const common = require('../common');
 const assert = require('assert');
 const fs = require('fs');
+const path = require('path');
 
 const html = require('../../tools/doc/html.js');
 
@@ -13,13 +14,13 @@ const html = require('../../tools/doc/html.js');
 // have an html parser.
 const testData = [
   {
-    'file': common.fixturesDir + '/sample_document.md',
-    'html': '<ol><li>fish</li><li><p>fish</p></li><li><p>Redfish</p></li>' +
+    file: path.join(common.fixturesDir, 'sample_document.md'),
+    html: '<ol><li>fish</li><li><p>fish</p></li><li><p>Redfish</p></li>' +
       '<li>Bluefish</li></ol>'
   },
   {
-    'file': common.fixturesDir + '/order_of_end_tags_5873.md',
-    'html': '<h3>ClassMethod: Buffer.from(array) <span> ' +
+    file: path.join(common.fixturesDir, 'order_of_end_tags_5873.md'),
+    html: '<h3>ClassMethod: Buffer.from(array) <span> ' +
       '<a class="mark" href="#foo_class_method_buffer_from_array" ' +
       'id="foo_class_method_buffer_from_array">#</a> </span> </h3><div' +
       'class="signature"><ul><li><code>array</code><a ' +
@@ -28,8 +29,8 @@ const testData = [
       '</ul></div>'
   },
   {
-    'file': common.fixturesDir + '/doc_with_yaml.md',
-    'html': '<h1>Sample Markdown with YAML info' +
+    file: path.join(common.fixturesDir, 'doc_with_yaml.md'),
+    html: '<h1>Sample Markdown with YAML info' +
       '<span><a class="mark" href="#foo_sample_markdown_with_yaml_info" ' +
       ' id="foo_sample_markdown_with_yaml_info">#</a></span></h1>' +
       '<h2>Foobar<span><a class="mark" href="#foo_foobar" ' +
diff --git a/test/doctool/test-doctool-json.js b/test/doctool/test-doctool-json.js
index 79cf4ce3c3ed47..7b9fbeb019f1e1 100644
--- a/test/doctool/test-doctool-json.js
+++ b/test/doctool/test-doctool-json.js
@@ -3,6 +3,7 @@
 const common = require('../common');
 const assert = require('assert');
 const fs = require('fs');
+const path = require('path');
 
 const json = require('../../tools/doc/json.js');
 
@@ -12,113 +13,116 @@ const json = require('../../tools/doc/json.js');
 // The json property is some json which will be generated by the doctool.
 var testData = [
   {
-    'file': common.fixturesDir + '/sample_document.md',
-    'json': {
-      'source': 'foo',
-      'modules': [ { 'textRaw': 'Sample Markdown',
-        'name': 'sample_markdown',
-        'modules': [ { 'textRaw': 'Seussian Rhymes',
-          'name': 'seussian_rhymes',
-          'desc': '<ol>\n<li>fish</li>\n<li><p>fish</p>\n</li>\n<li>' +
+    file: path.join(common.fixturesDir, 'sample_document.md'),
+    json: {
+      source: 'foo',
+      modules: [{
+        textRaw: 'Sample Markdown',
+        name: 'sample_markdown',
+        modules: [{
+          textRaw: 'Seussian Rhymes',
+          name: 'seussian_rhymes',
+          desc: '<ol>\n<li>fish</li>\n<li><p>fish</p>\n</li>\n<li>' +
                   '<p>Red fish</p>\n</li>\n<li>Blue fish</li>\n</ol>\n',
-          'type': 'module',
-          'displayName': 'Seussian Rhymes'
-         } ],
-        'type': 'module',
-        'displayName': 'Sample Markdown'
-      } ]
+          type: 'module',
+          displayName: 'Seussian Rhymes'
+        }],
+        type: 'module',
+        displayName: 'Sample Markdown'
+      }]
     }
   },
   {
-    'file': common.fixturesDir + '/order_of_end_tags_5873.md',
-    'json': {
-      'source': 'foo',
-      'modules': [ {
-        'textRaw': 'Title',
-        'name': 'title',
-        'modules': [ {
-          'textRaw': 'Subsection',
-          'name': 'subsection',
-          'classMethods': [ {
-            'textRaw': 'Class Method: Buffer.from(array)',
-            'type': 'classMethod',
-            'name': 'from',
-            'signatures': [ {
-              'params': [ {
-                'textRaw': '`array` {Array} ',
-                'name': 'array',
-                'type': 'Array'
-              } ]
-            },
+    file: path.join(common.fixturesDir, 'order_of_end_tags_5873.md'),
+    json: {
+      source: 'foo',
+      modules: [{
+        textRaw: 'Title',
+        name: 'title',
+        modules: [{
+          textRaw: 'Subsection',
+          name: 'subsection',
+          classMethods: [{
+            textRaw: 'Class Method: Buffer.from(array)',
+            type: 'classMethod',
+            name: 'from',
+            signatures: [
+              {
+                params: [{
+                  textRaw: '`array` {Array} ',
+                  name: 'array',
+                  type: 'Array'
+                }]
+              },
               {
-                'params': [ {
-                  'name': 'array'
-                } ]
+                params: [{
+                  name: 'array'
+                }]
               }
             ]
-          } ],
-          'type': 'module',
-          'displayName': 'Subsection'
-        } ],
-        'type': 'module',
-        'displayName': 'Title'
-      } ]
+          }],
+          type: 'module',
+          displayName: 'Subsection'
+        }],
+        type: 'module',
+        displayName: 'Title'
+      }]
     }
   },
   {
-    'file': common.fixturesDir + '/doc_with_yaml.md',
-    'json': {
-      'source': 'foo',
-      'modules': [
+    file: path.join(common.fixturesDir, 'doc_with_yaml.md'),
+    json: {
+      source: 'foo',
+      modules: [
         {
-          'textRaw': 'Sample Markdown with YAML info',
-          'name': 'sample_markdown_with_yaml_info',
-          'modules': [
+          textRaw: 'Sample Markdown with YAML info',
+          name: 'sample_markdown_with_yaml_info',
+          modules: [
             {
-              'textRaw': 'Foobar',
-              'name': 'foobar',
-              'meta': {
-                'added': ['v1.0.0']
+              textRaw: 'Foobar',
+              name: 'foobar',
+              meta: {
+                added: ['v1.0.0']
               },
-              'desc': '<p>Describe <code>Foobar</code> in more detail ' +
+              desc: '<p>Describe <code>Foobar</code> in more detail ' +
                 'here.</p>\n',
-              'type': 'module',
-              'displayName': 'Foobar'
+              type: 'module',
+              displayName: 'Foobar'
             },
             {
-              'textRaw': 'Foobar II',
-              'name': 'foobar_ii',
-              'meta': {
-                'added': ['v5.3.0', 'v4.2.0']
+              textRaw: 'Foobar II',
+              name: 'foobar_ii',
+              meta: {
+                added: ['v5.3.0', 'v4.2.0']
               },
-              'desc': '<p>Describe <code>Foobar II</code> in more detail ' +
+              desc: '<p>Describe <code>Foobar II</code> in more detail ' +
                 'here.</p>\n',
-              'type': 'module',
-              'displayName': 'Foobar II'
+              type: 'module',
+              displayName: 'Foobar II'
             },
             {
-              'textRaw': 'Deprecated thingy',
-              'name': 'deprecated_thingy',
-              'meta': {
-                'added': ['v1.0.0'],
-                'deprecated': ['v2.0.0']
+              textRaw: 'Deprecated thingy',
+              name: 'deprecated_thingy',
+              meta: {
+                added: ['v1.0.0'],
+                deprecated: ['v2.0.0']
               },
-              'desc': '<p>Describe <code>Deprecated thingy</code> in more ' +
+              desc: '<p>Describe <code>Deprecated thingy</code> in more ' +
                 'detail here.</p>\n',
-              'type': 'module',
-              'displayName': 'Deprecated thingy'
+              type: 'module',
+              displayName: 'Deprecated thingy'
             },
             {
-              'textRaw': 'Something',
-              'name': 'something',
-              'desc': '<!-- This is not a metadata comment -->\n<p>' +
+              textRaw: 'Something',
+              name: 'something',
+              desc: '<!-- This is not a metadata comment -->\n<p>' +
                 'Describe <code>Something</code> in more detail here.</p>\n',
-              'type': 'module',
-              'displayName': 'Something'
+              type: 'module',
+              displayName: 'Something'
             }
           ],
-          'type': 'module',
-          'displayName': 'Sample Markdown with YAML info'
+          type: 'module',
+          displayName: 'Sample Markdown with YAML info'
         }
       ]
     }