From 550385362b79c0e036d2b1691848fe504ab7d3f4 Mon Sep 17 00:00:00 2001
From: Ian James <ian.james@digital.cabinet-office.gov.uk>
Date: Wed, 31 Jul 2019 14:18:43 +0100
Subject: [PATCH] WIP

---
 Gemfile.lock                                  |    2 +
 .../component_guide/index.html.erb            |    2 +-
 govuk_publishing_components.gemspec           |    1 +
 package-lock.json                             | 3482 +++++++++++++++--
 package.json                                  |    3 +-
 .../visual_regression_testing.spec.rb         |   26 +
 6 files changed, 3253 insertions(+), 263 deletions(-)
 create mode 100644 spec/components/visual_regression_testing.spec.rb

diff --git a/Gemfile.lock b/Gemfile.lock
index 5eecba7ff4..fcd2d08b0a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -165,6 +165,7 @@ GEM
     parallel (1.17.0)
     parser (2.6.3.0)
       ast (~> 2.4.0)
+    percy-capybara (4.0.2)
     phantomjs (2.1.1.0)
     plek (3.0.0)
     pry (0.12.2)
@@ -319,6 +320,7 @@ DEPENDENCIES
   govuk_schemas (~> 3.2)
   govuk_test (~> 1)
   jasmine (~> 3.4.0)
+  percy-capybara (~> 4.0, >= 4.0.2)
   pry-byebug
   rspec-rails (~> 3.8)
   uglifier (>= 4.1.0)
diff --git a/app/views/govuk_publishing_components/component_guide/index.html.erb b/app/views/govuk_publishing_components/component_guide/index.html.erb
index e6ddec4126..0187604968 100644
--- a/app/views/govuk_publishing_components/component_guide/index.html.erb
+++ b/app/views/govuk_publishing_components/component_guide/index.html.erb
@@ -31,7 +31,7 @@
 
 <h2 class="component-doc-h2">Components in the gem</h2>
 
-<ul class="component-list">
+<ul class="component-list" id="components-in-the-gem-list">
   <% @gem_component_docs.each do |component_doc| %>
     <li>
       <%= link_to component_doc.name, component_doc_path(component_doc.id), class: "govuk-link" %>
diff --git a/govuk_publishing_components.gemspec b/govuk_publishing_components.gemspec
index 732530f07d..e778f6f62d 100644
--- a/govuk_publishing_components.gemspec
+++ b/govuk_publishing_components.gemspec
@@ -33,6 +33,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "govuk_schemas", "~> 3.2"
   s.add_development_dependency "govuk_test", "~> 1"
   s.add_development_dependency "jasmine", "~> 3.4.0"
+  s.add_development_dependency "percy-capybara", "~> 4.0", ">= 4.0.2"
   s.add_development_dependency "pry-byebug"
   s.add_development_dependency "rspec-rails", "~> 3.8"
   s.add_development_dependency "uglifier", ">= 4.1.0"
diff --git a/package-lock.json b/package-lock.json
index 04d4eac335..0d1f2ec076 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3,6 +3,199 @@
   "requires": true,
   "lockfileVersion": 1,
   "dependencies": {
+    "@mrmlnc/readdir-enhanced": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
+      "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
+      "dev": true,
+      "requires": {
+        "call-me-maybe": "^1.0.1",
+        "glob-to-regexp": "^0.3.0"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz",
+      "integrity": "sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==",
+      "dev": true
+    },
+    "@oclif/color": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/@oclif/color/-/color-0.0.0.tgz",
+      "integrity": "sha512-KKd3W7eNwfNF061tr663oUNdt8EMnfuyf5Xv55SGWA1a0rjhWqS/32P7OeB7CbXcJUBdfVrPyR//1afaW12AWw==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.1",
+        "supports-color": "^5.4.0",
+        "tslib": "^1"
+      }
+    },
+    "@oclif/command": {
+      "version": "1.5.16",
+      "resolved": "https://registry.npmjs.org/@oclif/command/-/command-1.5.16.tgz",
+      "integrity": "sha512-bzqNz9/EblkohokXbico/14r05oRe8aa06S3MLEo4GlmyOce2abIOx1oZfUDl8ekQuKO+Ycw9Jco+hN2aL423A==",
+      "dev": true,
+      "requires": {
+        "@oclif/errors": "^1.2.2",
+        "@oclif/parser": "^3.7.3",
+        "debug": "^4.1.1",
+        "semver": "^5.6.0"
+      }
+    },
+    "@oclif/config": {
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/@oclif/config/-/config-1.13.2.tgz",
+      "integrity": "sha512-RUOKeuAaopo3zrA5hcgE0PT2lbAUT72+eJdqTlWyI9sbPrGHZgUwV+vrL6Qal7ywWYDkL0vrKd1YS4yXtKIDKw==",
+      "dev": true,
+      "requires": {
+        "@oclif/parser": "^3.8.0",
+        "debug": "^4.1.1",
+        "tslib": "^1.9.3"
+      }
+    },
+    "@oclif/errors": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/@oclif/errors/-/errors-1.2.2.tgz",
+      "integrity": "sha512-Eq8BFuJUQcbAPVofDxwdE0bL14inIiwt5EaKRVY9ZDIG11jwdXZqiQEECJx0VfnLyUZdYfRd/znDI/MytdJoKg==",
+      "dev": true,
+      "requires": {
+        "clean-stack": "^1.3.0",
+        "fs-extra": "^7.0.0",
+        "indent-string": "^3.2.0",
+        "strip-ansi": "^5.0.0",
+        "wrap-ansi": "^4.0.0"
+      }
+    },
+    "@oclif/linewrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@oclif/linewrap/-/linewrap-1.0.0.tgz",
+      "integrity": "sha512-Ups2dShK52xXa8w6iBWLgcjPJWjais6KPJQq3gQ/88AY6BXoTX+MIGFPrWQO1KLMiQfoTpcLnUwloN4brrVUHw==",
+      "dev": true
+    },
+    "@oclif/parser": {
+      "version": "3.8.3",
+      "resolved": "https://registry.npmjs.org/@oclif/parser/-/parser-3.8.3.tgz",
+      "integrity": "sha512-zN+3oGuv9Lg8NjFvxZTDKFEmhAMfAvd/JWeQp3Ri8pDezoyJQi4OSHHLM8sdHjBh8sePewfWI7+fDUXdrVbrqg==",
+      "dev": true,
+      "requires": {
+        "@oclif/linewrap": "^1.0.0",
+        "chalk": "^2.4.2",
+        "tslib": "^1.9.3"
+      }
+    },
+    "@oclif/plugin-help": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@oclif/plugin-help/-/plugin-help-2.2.0.tgz",
+      "integrity": "sha512-56iIgE7NQfwy/ZrWrvrEfJGb5rrMUt409yoQGw4feiU101UudA1btN1pbUbcKBr7vY9KFeqZZcftXEGxOp7zBg==",
+      "dev": true,
+      "requires": {
+        "@oclif/command": "^1.5.13",
+        "chalk": "^2.4.1",
+        "indent-string": "^3.2.0",
+        "lodash.template": "^4.4.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0",
+        "widest-line": "^2.0.1",
+        "wrap-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
+      }
+    },
+    "@oclif/plugin-not-found": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/@oclif/plugin-not-found/-/plugin-not-found-1.2.2.tgz",
+      "integrity": "sha512-SPlmiJFmTFltQT/owdzQwKgq6eq5AEKVwVK31JqbzK48bRWvEL1Ye60cgztXyZ4bpPn2Fl+KeL3FWFQX41qJuA==",
+      "dev": true,
+      "requires": {
+        "@oclif/color": "^0.0.0",
+        "@oclif/command": "^1.5.3",
+        "cli-ux": "^4.9.0",
+        "fast-levenshtein": "^2.0.6",
+        "lodash": "^4.17.11"
+      }
+    },
+    "@oclif/screen": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@oclif/screen/-/screen-1.0.4.tgz",
+      "integrity": "sha512-60CHpq+eqnTxLZQ4PGHYNwUX572hgpMHGPtTWMjdTMsAvlm69lZV/4ly6O3sAYkomo4NggGcomrDpBe34rxUqw==",
+      "dev": true
+    },
+    "@percy/agent": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/@percy/agent/-/agent-0.9.0.tgz",
+      "integrity": "sha512-VjkqHLguwcY6WgKtxc2kviK/RzsBMMcMPp2EkuIhEjunQb5x5OJ3B7rm3bVMsdDOvToD/YHo0xaMVGOzIZ50Fg==",
+      "dev": true,
+      "requires": {
+        "@oclif/command": "1.5.16",
+        "@oclif/config": "^1",
+        "@oclif/plugin-help": "^2",
+        "@oclif/plugin-not-found": "^1.2",
+        "axios": "^0.18.1",
+        "body-parser": "^1.18.3",
+        "colors": "^1.3.2",
+        "cors": "^2.8.4",
+        "cross-spawn": "^6.0.5",
+        "deepmerge": "^3.2.1",
+        "express": "^4.16.3",
+        "generic-pool": "^3.7.1",
+        "globby": "^9.2.0",
+        "js-yaml": "^3.13.1",
+        "percy-client": "^3.0.3",
+        "puppeteer": "^1.13.0",
+        "retry-axios": "^1.0.1",
+        "winston": "^2.0.0"
+      }
+    },
+    "@types/events": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+      "dev": true
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "12.6.8",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.6.8.tgz",
+      "integrity": "sha512-aX+gFgA5GHcDi89KG5keey2zf0WfZk/HAQotEamsK2kbey+8yGKcson0hbK8E+v0NArlCJQCqMP161YhV6ZXLg==",
+      "dev": true
+    },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "dev": true,
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
     "accessible-autocomplete": {
       "version": "git://github.com/alphagov/accessible-autocomplete.git#0c518b4fa79b9a95b544410858486ed9e6403c84",
       "from": "git://github.com/alphagov/accessible-autocomplete.git#add-multiselect-support",
@@ -33,14 +226,25 @@
         }
       }
     },
+    "agent-base": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
+      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
+      "dev": true,
+      "requires": {
+        "es6-promisify": "^5.0.0"
+      }
+    },
     "ajv": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "dev": true,
       "requires": {
-        "co": "^4.6.0",
-        "json-stable-stringify": "^1.0.1"
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "ajv-keywords": {
@@ -50,21 +254,30 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
-      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
       "dev": true
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "ansicolors": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.3.2.tgz",
+      "integrity": "sha1-ZlWX3oap/+Oqm/vmyuXG6kJrSXk=",
       "dev": true
     },
     "argparse": {
@@ -76,6 +289,30 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "arr-diff": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+      "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
+      "dev": true
+    },
+    "arr-flatten": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
+      "dev": true
+    },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
+      "dev": true
+    },
     "array-includes": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
@@ -86,11 +323,99 @@
         "es-abstract": "^1.7.0"
       }
     },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
+    "array-unique": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
+      "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
+      "dev": true
+    },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
+      "dev": true
+    },
+    "async": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+      "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
+      "dev": true
+    },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
+      "dev": true
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
+    "atob": {
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@@ -173,6 +752,43 @@
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+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "dev": true,
+      "requires": {
+        "psl": "^1.1.24",
+        "punycode": "^1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        }
+      }
+    },
+    "treeify": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/treeify/-/treeify-1.1.0.tgz",
+      "integrity": "sha512-1m4RA7xVAJrSGrrXGs0L3YTwyvBs2S8PbRHaLZAkFw7JR8oIFwYtysxlBZhYIa7xSyiYJKZ3iGrrk55cGA3i9A==",
+      "dev": true
+    },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -2259,12 +5033,34 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dev": true,
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "union-value": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
+      "dev": true,
+      "requires": {
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^2.0.1"
+      }
+    },
     "uniq": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
@@ -2277,6 +5073,52 @@
       "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
       "dev": true
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
+    },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
+      },
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        }
+      }
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -2286,6 +5128,18 @@
         "punycode": "^2.1.0"
       }
     },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "use": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+      "dev": true
+    },
     "user-home": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/user-home/-/user-home-2.0.0.tgz",
@@ -2310,6 +5164,18 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
+    "uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -2320,6 +5186,32 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "dev": true
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
+    "walk": {
+      "version": "2.3.14",
+      "resolved": "https://registry.npmjs.org/walk/-/walk-2.3.14.tgz",
+      "integrity": "sha512-5skcWAUmySj6hkBdH6B6+3ddMjVQYH5Qy9QGbPmN8kVmLteXk+yVXg+yfk1nbX30EYakahLrr8iPcCxJQSCBeg==",
+      "dev": true,
+      "requires": {
+        "foreachasync": "^3.0.0"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -2329,32 +5221,100 @@
         "isexe": "^2.0.0"
       }
     },
+    "widest-line": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
+      "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^2.1.1"
+      }
+    },
+    "winston": {
+      "version": "2.4.4",
+      "resolved": "https://registry.npmjs.org/winston/-/winston-2.4.4.tgz",
+      "integrity": "sha512-NBo2Pepn4hK4V01UfcWcDlmiVTs7VTB1h7bgnB0rgP146bYhMxX0ypCz3lBOfNxCO4Zuek7yeT+y/zM1OfMw4Q==",
+      "dev": true,
+      "requires": {
+        "async": "~1.0.0",
+        "colors": "1.0.x",
+        "cycle": "1.0.x",
+        "eyes": "0.1.x",
+        "isstream": "0.1.x",
+        "stack-trace": "0.0.x"
+      },
+      "dependencies": {
+        "colors": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+          "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
+          "dev": true
+        }
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-4.0.0.tgz",
+      "integrity": "sha512-uMTsj9rDb0/7kk1PbcbCcwvHUxp60fGDB/NNXpVa0Q+ic/e7y5+BwTxKfQ33VYgDppSwi/FBzpetYzo8s6tfbg==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^2.1.1",
+        "strip-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
-    "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+    "ws": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
       "dev": true,
       "requires": {
-        "mkdirp": "^0.5.1"
+        "async-limiter": "~1.0.0"
       }
     },
     "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "dev": true
+    },
+    "yauzl": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
+      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "dev": true,
+      "requires": {
+        "fd-slicer": "~1.0.1"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 694a5648a2..9b175e5c84 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
   },
   "devDependencies": {
     "sass-lint": "^1.13.1",
-    "standard": "^12.0.1"
+    "standard": "^12.0.1",
+    "@percy/agent": "^0.9.0"
   }
 }
diff --git a/spec/components/visual_regression_testing.spec.rb b/spec/components/visual_regression_testing.spec.rb
new file mode 100644
index 0000000000..4f45af5e8e
--- /dev/null
+++ b/spec/components/visual_regression_testing.spec.rb
@@ -0,0 +1,26 @@
+require 'rails_helper'
+require 'percy'
+
+describe 'screenshots', type: :feature, js: true do
+  it 'screenshots' do
+    visit '/component-guide'
+
+    component_links = []
+
+    find('#components-in-the-gem-list').all('a').each { |link|
+      component_links.push link[:href]
+    }
+
+    # component_links.first(2).last(1).each{ |link|
+    component_links.each { |link|
+      slug = link.gsub(/http:\/\/127.0.0.1:\d{4,5}\/component-guide\//, '')
+
+      unless slug == 'govspeak'
+        visit "#{link}/preview"
+        name = title.gsub(/(: Default|) preview - Component Guide/, '')
+        sleep 1
+        Percy.snapshot(page, name: name)
+      end
+    }
+  end
+end