From 87bc1115da8cbe270c685b276aa1446e6cb92a4e Mon Sep 17 00:00:00 2001
From: Martin Helmut Fieber <info@martin-fieber.de>
Date: Sat, 22 Jun 2019 21:02:06 +0200
Subject: [PATCH] feat: implement first draft for snapshot testing

---
 .babelrc                                      |   3 +
 .eslintrc.js                                  |  13 +-
 .gitignore                                    |   1 +
 package.json                                  |  17 +-
 pnpm-lock.yaml                                | 412 ++++++++++++++----
 .../__snapshots__/snapshot.test.jsx.snap      |  18 +
 src/__tests__/runner.test.js                  |  31 ++
 src/__tests__/snapshot.test.jsx               |  27 ++
 src/cli.js                                    |  12 +-
 src/runner.js                                 |  78 +++-
 10 files changed, 514 insertions(+), 98 deletions(-)
 create mode 100644 .babelrc
 create mode 100644 src/__tests__/__snapshots__/snapshot.test.jsx.snap
 create mode 100644 src/__tests__/snapshot.test.jsx

diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..bfc8964
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,3 @@
+{
+  "plugins": ["@babel/plugin-transform-react-jsx"]
+}
diff --git a/.eslintrc.js b/.eslintrc.js
index 189fd66..129fe71 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -2,20 +2,23 @@
 
 module.exports = {
   root: true,
-  extends: ["eslint:recommended", "prettier"],
-  // plugins: ["compat"],
+  extends: ["eslint:recommended", "prettier", "plugin:react/recommended"],
   parserOptions: {
     ecmaVersion: 2018,
-    impliedStrict: false
+    impliedStrict: false,
+    jsx: true
   },
   env: {
     node: true,
     es6: true
   },
   settings: {
-    browsers: ["maintained node versions"]
+    browsers: ["maintained node versions"],
+    react: {
+      version: "detect"
+    }
   },
   rules: {
-    // "compat/compat": "error"
+    "no-prototype-builtins": 0
   }
 };
diff --git a/.gitignore b/.gitignore
index 2f24c57..d973174 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 coverage/
 .nyc_output/
+*.log
diff --git a/package.json b/package.json
index 1e234bf..53d537c 100644
--- a/package.json
+++ b/package.json
@@ -7,11 +7,11 @@
     "natr": "./src/cli.js"
   },
   "scripts": {
-    "test": "./src/cli.js src/__tests__/*.test.js | tap-color",
+    "test": "./src/cli.js \"src/__tests__/*.test.@(js|jsx)\" -r @babel/register | tap-color",
     "coverage": "nyc --reporter=html --reporter=text ./src/cli.js src/__tests__/*.test.js | tap-nyc",
-    "lint": "eslint --ignore-path .gitignore --ext .js .",
-    "format": "prettier --ignore-path .gitignore --write \"**/*.{js,md,json,yml}\"",
-    "format:check": "prettier --ignore-path .gitignore --list-different \"**/*.{js,md,json,yml}\""
+    "lint": "eslint --ignore-path .gitignore --ext .js --ext .jsx .",
+    "format": "prettier --ignore-path .gitignore --write \"**/*.{js,jsx,md,json,yml}\"",
+    "format:check": "prettier --ignore-path .gitignore --list-different \"**/*.{js,jsx,md,json,yml}\""
   },
   "keywords": [
     "natr",
@@ -44,14 +44,19 @@
     "stack-utils": "1.0.2"
   },
   "devDependencies": {
+    "@babel/core": "7.4.5",
+    "@babel/plugin-transform-react-jsx": "7.3.0",
+    "@babel/register": "7.4.4",
     "commitizen": "3.1.1",
     "concat-stream": "2.0.0",
     "cz-conventional-changelog": "2.1.0",
-    "eslint": "5.16.0",
+    "eslint": "6.0.0",
     "eslint-config-prettier": "5.0.0",
-    "eslint-plugin-compat": "3.1.2",
+    "eslint-plugin-react": "7.13.0",
     "nyc": "14.1.1",
     "prettier": "1.18.2",
+    "react": "16.8.6",
+    "react-test-renderer": "16.8.6",
     "stream-spec": "0.3.6",
     "tap-color": "1.1.0",
     "tap-nirvana": "1.1.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fa46806..14947df 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5,14 +5,19 @@ dependencies:
   object-inspect: 1.6.0
   stack-utils: 1.0.2
 devDependencies:
+  '@babel/core': 7.4.5
+  '@babel/plugin-transform-react-jsx': 7.3.0_@babel+core@7.4.5
+  '@babel/register': 7.4.4_@babel+core@7.4.5
   commitizen: 3.1.1
   concat-stream: 2.0.0
   cz-conventional-changelog: 2.1.0
-  eslint: 5.16.0
-  eslint-config-prettier: 5.0.0_eslint@5.16.0
-  eslint-plugin-compat: 3.1.2_eslint@5.16.0
+  eslint: 6.0.0
+  eslint-config-prettier: 5.0.0_eslint@6.0.0
+  eslint-plugin-react: 7.13.0_eslint@6.0.0
   nyc: 14.1.1
   prettier: 1.18.2
+  react: 16.8.6
+  react-test-renderer: 16.8.6_react@16.8.6
   stream-spec: 0.3.6
   tap-color: 1.1.0
   tap-nirvana: 1.1.0
@@ -25,6 +30,27 @@ packages:
     dev: true
     resolution:
       integrity: sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==
+  /@babel/core/7.4.5:
+    dependencies:
+      '@babel/code-frame': 7.0.0
+      '@babel/generator': 7.4.4
+      '@babel/helpers': 7.4.4
+      '@babel/parser': 7.4.5
+      '@babel/template': 7.4.4
+      '@babel/traverse': 7.4.5
+      '@babel/types': 7.4.4
+      convert-source-map: 1.6.0
+      debug: 4.1.1
+      json5: 2.1.0
+      lodash: 4.17.11
+      resolve: 1.11.1
+      semver: 5.7.0
+      source-map: 0.5.7
+    dev: true
+    engines:
+      node: '>=6.9.0'
+    resolution:
+      integrity: sha512-OvjIh6aqXtlsA8ujtGKfC7LYWksYSX8yQcM8Ay3LuvVeQ63lcOKgoZWVqcpFwkd29aYU9rVx7jxhfhiEDV9MZA==
   /@babel/generator/7.4.4:
     dependencies:
       '@babel/types': 7.4.4
@@ -35,6 +61,13 @@ packages:
     dev: true
     resolution:
       integrity: sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==
+  /@babel/helper-builder-react-jsx/7.3.0:
+    dependencies:
+      '@babel/types': 7.4.4
+      esutils: 2.0.2
+    dev: true
+    resolution:
+      integrity: sha512-MjA9KgwCuPEkQd9ncSXvSyJ5y+j2sICHyrI0M3L+6fnS4wMSNDc1ARXsbTfbb2cXHn17VisSnU/sHFTCxVxSMw==
   /@babel/helper-function-name/7.1.0:
     dependencies:
       '@babel/helper-get-function-arity': 7.0.0
@@ -49,12 +82,24 @@ packages:
     dev: true
     resolution:
       integrity: sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==
+  /@babel/helper-plugin-utils/7.0.0:
+    dev: true
+    resolution:
+      integrity: sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==
   /@babel/helper-split-export-declaration/7.4.4:
     dependencies:
       '@babel/types': 7.4.4
     dev: true
     resolution:
       integrity: sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==
+  /@babel/helpers/7.4.4:
+    dependencies:
+      '@babel/template': 7.4.4
+      '@babel/traverse': 7.4.5
+      '@babel/types': 7.4.4
+    dev: true
+    resolution:
+      integrity: sha512-igczbR/0SeuPR8RFfC7tGrbdTbFL3QTvH6D+Z6zNxnTe//GyqmtHmDkzrqDmyZ3eSwPqB/LhyKoU5DXsp+Vp2A==
   /@babel/highlight/7.0.0:
     dependencies:
       chalk: 2.4.2
@@ -70,12 +115,40 @@ packages:
     hasBin: true
     resolution:
       integrity: sha512-9mUqkL1FF5T7f0WDFfAoDdiMVPWsdD1gZYzSnaXsxUCUqzuch/8of9G3VUSNiZmMBoRxT3neyVsqeiL/ZPcjew==
-  /@babel/runtime/7.4.5:
+  /@babel/plugin-syntax-jsx/7.2.0_@babel+core@7.4.5:
+    dependencies:
+      '@babel/core': 7.4.5
+      '@babel/helper-plugin-utils': 7.0.0
+    dev: true
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    resolution:
+      integrity: sha512-VyN4QANJkRW6lDBmENzRszvZf3/4AXaj9YR7GwrWeeN9tEBPuXbmDYVU9bYBN0D70zCWVwUy0HWq2553VCb6Hw==
+  /@babel/plugin-transform-react-jsx/7.3.0_@babel+core@7.4.5:
+    dependencies:
+      '@babel/core': 7.4.5
+      '@babel/helper-builder-react-jsx': 7.3.0
+      '@babel/helper-plugin-utils': 7.0.0
+      '@babel/plugin-syntax-jsx': 7.2.0_@babel+core@7.4.5
+    dev: true
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
+    resolution:
+      integrity: sha512-a/+aRb7R06WcKvQLOu4/TpjKOdvVEKRLWFpKcNuHhiREPgGRB4TQJxq07+EZLS8LFVYpfq1a5lDUnuMdcCpBKg==
+  /@babel/register/7.4.4_@babel+core@7.4.5:
     dependencies:
-      regenerator-runtime: 0.13.2
+      '@babel/core': 7.4.5
+      core-js: 3.1.4
+      find-cache-dir: 2.1.0
+      lodash: 4.17.11
+      mkdirp: 0.5.1
+      pirates: 4.0.1
+      source-map-support: 0.5.12
     dev: true
+    peerDependencies:
+      '@babel/core': ^7.0.0-0
     resolution:
-      integrity: sha512-TuI4qpWZP6lGOGIuGWtp9sPluqYICmbk8T/1vpSysqJxRPkudh/ofFWyqdcMsDf2s7KvDL4/YHgKyvcS3g9CJQ==
+      integrity: sha512-sn51H88GRa00+ZoMqCVgOphmswG4b7mhf9VOB0LUBAieykq2GnRFerlN+JQkO/ntT7wz4jaHNSRPg9IdMPEUkA==
   /@babel/template/7.4.4:
     dependencies:
       '@babel/code-frame': 7.0.0
@@ -228,6 +301,15 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=
+  /array-includes/3.0.3:
+    dependencies:
+      define-properties: 1.1.3
+      es-abstract: 1.13.0
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=
   /array-unique/0.3.2:
     dev: true
     engines:
@@ -240,10 +322,6 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
-  /ast-metadata-inferer/0.1.1:
-    dev: true
-    resolution:
-      integrity: sha512-hc9w8Qrgg9Lf9iFcZVhNjUnhrd2BBpTlyCnegPVvCe6O0yMrF57a6Cmh7k+xUsfUOMh9wajOL5AsGOBNEyTCcw==
   /astral-regex/1.0.0:
     dev: true
     engines:
@@ -307,15 +385,6 @@ packages:
       node: '>=8'
     resolution:
       integrity: sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==
-  /browserslist/4.6.3:
-    dependencies:
-      caniuse-lite: 1.0.30000976
-      electron-to-chromium: 1.3.167
-      node-releases: 1.1.23
-    dev: true
-    hasBin: true
-    resolution:
-      integrity: sha512-CNBqTCq22RKM8wKJNowcqihHJ4SkI8CGeK7KOR9tPboXUuS5Zk5lQgzzTbs4oxD8x+6HUshZUa2OyNI9lR93bQ==
   /buffer-from/1.1.1:
     dev: true
     resolution:
@@ -375,14 +444,6 @@ packages:
       node: '>=6'
     resolution:
       integrity: sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
-  /caniuse-db/1.0.30000976:
-    dev: true
-    resolution:
-      integrity: sha512-QvzPHBh2cYmilQAiiamun3ooHRGKFKtVwLzzx0RG7avjpj7Gii89Yzs92EKeHNqbAA2rlcFXg4GzP/tC68OGuw==
-  /caniuse-lite/1.0.30000976:
-    dev: true
-    resolution:
-      integrity: sha512-tleNB1IwPRqZiod6nUNum63xQCMN96BUO2JTeiwuRM7p9d616EHsMBjBWJMudX39qCaPuWY8KEWzMZq7A9XQMQ==
   /chalk/1.1.3:
     dependencies:
       ansi-styles: 2.2.1
@@ -526,6 +587,11 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=
+  /core-js/3.1.4:
+    dev: true
+    requiresBuild: true
+    resolution:
+      integrity: sha512-YNZN8lt82XIMLnLirj9MhKDFZHalwzzrL9YLt6eb0T5D0EDl4IQ90IGkua8mHbnxNrkj1d8hbdizMc0Qmg1WnQ==
   /core-util-is/1.0.2:
     dev: true
     resolution:
@@ -611,6 +677,14 @@ packages:
       node: '>=4'
     resolution:
       integrity: sha1-9fj7sYp9bVCyH2QfZJ67Uiz+JPc=
+  /define-properties/1.1.3:
+    dependencies:
+      object-keys: 1.1.1
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==
   /define-property/0.2.5:
     dependencies:
       is-descriptor: 0.1.6
@@ -648,6 +722,14 @@ packages:
       node: '>=4'
     resolution:
       integrity: sha1-OHHMCmoALow+Wzz38zYmRnXwa50=
+  /doctrine/2.1.0:
+    dependencies:
+      esutils: 2.0.2
+    dev: true
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==
   /doctrine/3.0.0:
     dependencies:
       esutils: 2.0.2
@@ -666,10 +748,6 @@ packages:
     dev: true
     resolution:
       integrity: sha1-ixLauHjA1p4+eJEFFmKjL8a93ME=
-  /electron-to-chromium/1.3.167:
-    dev: true
-    resolution:
-      integrity: sha512-84IjpeRudjP43Q0+K7tlS7ESoHOl0W6CIdzs5reS9p+sAjCQEDiaAyiXN2v1qLUdL+Of6ZSaH4Cq6bl+sfzy8A==
   /emoji-regex/7.0.3:
     dev: true
     resolution:
@@ -686,6 +764,29 @@ packages:
     dev: true
     resolution:
       integrity: sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==
+  /es-abstract/1.13.0:
+    dependencies:
+      es-to-primitive: 1.2.0
+      function-bind: 1.1.1
+      has: 1.0.3
+      is-callable: 1.1.4
+      is-regex: 1.0.4
+      object-keys: 1.1.1
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==
+  /es-to-primitive/1.2.0:
+    dependencies:
+      is-callable: 1.1.4
+      is-date-object: 1.0.1
+      is-symbol: 1.0.2
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==
   /es6-error/4.1.1:
     dev: true
     resolution:
@@ -696,9 +797,9 @@ packages:
       node: '>=0.8.0'
     resolution:
       integrity: sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
-  /eslint-config-prettier/5.0.0_eslint@5.16.0:
+  /eslint-config-prettier/5.0.0_eslint@6.0.0:
     dependencies:
-      eslint: 5.16.0
+      eslint: 6.0.0
       get-stdin: 6.0.0
     dev: true
     hasBin: true
@@ -706,22 +807,23 @@ packages:
       eslint: '>=3.14.1'
     resolution:
       integrity: sha512-c17Aqiz5e8LEqoc/QPmYnaxQFAHTx2KlCZBPxXXjEMmNchOLnV/7j0HoPZuC+rL/tDC9bazUYOKJW9bOhftI/w==
-  /eslint-plugin-compat/3.1.2_eslint@5.16.0:
-    dependencies:
-      '@babel/runtime': 7.4.5
-      ast-metadata-inferer: 0.1.1
-      browserslist: 4.6.3
-      caniuse-db: 1.0.30000976
-      eslint: 5.16.0
-      mdn-browser-compat-data: 0.0.74
-      semver: 6.1.1
+  /eslint-plugin-react/7.13.0_eslint@6.0.0:
+    dependencies:
+      array-includes: 3.0.3
+      doctrine: 2.1.0
+      eslint: 6.0.0
+      has: 1.0.3
+      jsx-ast-utils: 2.1.0
+      object.fromentries: 2.0.0
+      prop-types: 15.7.2
+      resolve: 1.11.1
     dev: true
     engines:
-      node: '>=8.x'
+      node: '>=4'
     peerDependencies:
       eslint: ^3.0.0 || ^4.0.0 || ^5.0.0
     resolution:
-      integrity: sha512-10XuVdl1RG53EvXNep6VwVsIbXsJM/g+M2fCvMTuw5CSVeITAw108HjC79+NPwrBbYFpdOfeIR08CviBDZQDKg==
+      integrity: sha512-uA5LrHylu8lW/eAH3bEQe9YdzpPaFd9yAJTwTi/i/BKTD7j6aQMKVAdGM/ML72zD6womuSK7EiGtMKuK06lWjQ==
   /eslint-scope/4.0.3:
     dependencies:
       esrecurse: 4.2.1
@@ -743,7 +845,7 @@ packages:
       node: '>=4'
     resolution:
       integrity: sha512-qzm/XxIbxm/FHyH341ZrbnMUpe+5Bocte9xkmFMzPMjRaZMcXww+MpBptFvtU+79L362nqiLhekCxCxDPaUMBQ==
-  /eslint/5.16.0:
+  /eslint/6.0.0:
     dependencies:
       '@babel/code-frame': 7.0.0
       ajv: 6.10.0
@@ -754,17 +856,18 @@ packages:
       eslint-scope: 4.0.3
       eslint-utils: 1.3.1
       eslint-visitor-keys: 1.0.0
-      espree: 5.0.1
+      espree: 6.0.0
       esquery: 1.0.1
       esutils: 2.0.2
       file-entry-cache: 5.0.1
       functional-red-black-tree: 1.0.1
-      glob: 7.1.4
+      glob-parent: 3.1.0
       globals: 11.12.0
       ignore: 4.0.6
       import-fresh: 3.0.0
       imurmurhash: 0.1.4
       inquirer: 6.4.1
+      is-glob: 4.0.1
       js-yaml: 3.13.1
       json-stable-stringify-without-jsonify: 1.0.1
       levn: 0.3.0
@@ -773,7 +876,6 @@ packages:
       mkdirp: 0.5.1
       natural-compare: 1.4.0
       optionator: 0.8.2
-      path-is-inside: 1.0.2
       progress: 2.0.3
       regexpp: 2.0.1
       semver: 5.7.0
@@ -783,11 +885,11 @@ packages:
       text-table: 0.2.0
     dev: true
     engines:
-      node: ^6.14.0 || ^8.10.0 || >=9.10.0
+      node: ^8.10.0 || ^10.13.0 || >=11.10.1
     hasBin: true
     resolution:
-      integrity: sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==
-  /espree/5.0.1:
+      integrity: sha512-SrrIfcd4tOgsspOKTSwamuTOAMZOUigHQhVMrzNjz4/B9Za6SHQDIocMIyIDfwDgx6MhS15nS6HC8kumCV2qBQ==
+  /espree/6.0.0:
     dependencies:
       acorn: 6.1.1
       acorn-jsx: 5.0.1_acorn@6.1.1
@@ -796,7 +898,7 @@ packages:
     engines:
       node: '>=6.0.0'
     resolution:
-      integrity: sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==
+      integrity: sha512-lJvCS6YbCn3ImT3yKkPe0+tJ+mH6ljhGNjHQH9mRtiO6gjhVAOhVXW1yjnwqGwTkK3bGbye+hb00nFNmu0l/1Q==
   /esprima/4.0.1:
     dev: true
     engines:
@@ -885,10 +987,6 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=
-  /extend/3.0.2:
-    dev: true
-    resolution:
-      integrity: sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==
   /external-editor/3.0.3:
     dependencies:
       chardet: 0.7.0
@@ -1077,6 +1175,10 @@ packages:
     dev: true
     resolution:
       integrity: sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
+  /function-bind/1.1.1:
+    dev: true
+    resolution:
+      integrity: sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==
   /functional-red-black-tree/1.0.1:
     dev: true
     resolution:
@@ -1107,6 +1209,13 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-3BXKHGcjh8p2vTesCjlbogQqLCg=
+  /glob-parent/3.1.0:
+    dependencies:
+      is-glob: 3.1.0
+      path-dirname: 1.0.2
+    dev: true
+    resolution:
+      integrity: sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=
   /glob-parent/5.0.0:
     dependencies:
       is-glob: 4.0.1
@@ -1196,6 +1305,12 @@ packages:
       node: '>=4'
     resolution:
       integrity: sha1-tdRU3CGZriJWmfNGfloH87lVuv0=
+  /has-symbols/1.0.0:
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha1-uhqPGvKg/DllD1yFA2dwQSIGO0Q=
   /has-value/0.3.1:
     dependencies:
       get-value: 2.0.6
@@ -1231,6 +1346,14 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-lbC2P+whRmGab+V/51Yo1aOe/k8=
+  /has/1.0.3:
+    dependencies:
+      function-bind: 1.1.1
+    dev: true
+    engines:
+      node: '>= 0.4.0'
+    resolution:
+      integrity: sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==
   /hasha/3.0.0:
     dependencies:
       is-stream: 1.1.0
@@ -1371,6 +1494,12 @@ packages:
     dev: true
     resolution:
       integrity: sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==
+  /is-callable/1.1.4:
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-r5p9sxJjYnArLjObpjA4xu5EKI3CuKHkJXMhT7kwbpUyIFD1n5PMAsoPvWnvtZiNz7LjkYDRZhd7FlI0eMijEA==
   /is-data-descriptor/0.1.4:
     dependencies:
       kind-of: 3.2.2
@@ -1387,6 +1516,12 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==
+  /is-date-object/1.0.1:
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY=
   /is-descriptor/0.1.6:
     dependencies:
       is-accessor-descriptor: 0.1.6
@@ -1440,6 +1575,14 @@ packages:
       node: '>=4'
     resolution:
       integrity: sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=
+  /is-glob/3.1.0:
+    dependencies:
+      is-extglob: 2.1.1
+    dev: true
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=
   /is-glob/4.0.1:
     dependencies:
       is-extglob: 2.1.1
@@ -1473,12 +1616,28 @@ packages:
     dev: true
     resolution:
       integrity: sha1-eaKp7OfwlugPNtKy87wWwf9L8/o=
+  /is-regex/1.0.4:
+    dependencies:
+      has: 1.0.3
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha1-VRdIm1RwkbCTDglWVM7SXul+lJE=
   /is-stream/1.1.0:
     dev: true
     engines:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
+  /is-symbol/1.0.2:
+    dependencies:
+      has-symbols: 1.0.0
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-HS8bZ9ox60yCJLH9snBpIwv9pYUAkcuLhSA1oero1UB5y9aiQpRA8y2ex945AOtCZL1lJDeIk3G5LthswI46Lw==
   /is-utf8/0.2.1:
     dev: true
     resolution:
@@ -1604,12 +1763,29 @@ packages:
     dev: true
     resolution:
       integrity: sha512-/11Pj1OyX814QMKO7K8l85SHPTr/KsFxHp8GE2zVa0BtJgGimDjXHfM3FhC7keQdWDea7+nXf+f1de7ATZcZkQ==
+  /json5/2.1.0:
+    dependencies:
+      minimist: 1.2.0
+    dev: true
+    engines:
+      node: '>=6'
+    hasBin: true
+    resolution:
+      integrity: sha512-8Mh9h6xViijj36g7Dxi+Y4S6hNGV96vcJZr/SrlHh1LR/pEn/8j/+qIBbs44YKl69Lrfctp4QD+AdWLTMqEZAQ==
   /jsonfile/4.0.0:
     dev: true
     optionalDependencies:
       graceful-fs: 4.1.15
     resolution:
       integrity: sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=
+  /jsx-ast-utils/2.1.0:
+    dependencies:
+      array-includes: 3.0.3
+    dev: true
+    engines:
+      node: '>=4.0'
+    resolution:
+      integrity: sha512-yDGDG2DS4JcqhA6blsuYbtsT09xL8AoLuUR2Gb5exrw7UEM19sBcOTq+YBBhrNbl0PUC4R4LnFu+dHg2HKeVvA==
   /kind-of/3.2.2:
     dependencies:
       is-buffer: 1.1.6
@@ -1693,6 +1869,13 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=
+  /loose-envify/1.4.0:
+    dependencies:
+      js-tokens: 4.0.0
+    dev: true
+    hasBin: true
+    resolution:
+      integrity: sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q==
   /lru-cache/4.1.5:
     dependencies:
       pseudomap: 1.0.2
@@ -1735,14 +1918,6 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-7Nyo8TFE5mDxtb1B8S80edmN+48=
-  /mdn-browser-compat-data/0.0.74:
-    dependencies:
-      extend: 3.0.2
-    dev: true
-    engines:
-      node: '>=6.0.0'
-    resolution:
-      integrity: sha512-d/pTMwk3tMxdBb5ziOr3wHLFJRfYqSgGMt5aKLpCDBFYu6gk/uLGibkikv/HmMJyU3GEb9R1VvkVkCw75hVMvg==
   /mem/4.3.0:
     dependencies:
       map-age-cleaner: 0.1.3
@@ -1890,12 +2065,12 @@ packages:
     dev: true
     resolution:
       integrity: sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
-  /node-releases/1.1.23:
-    dependencies:
-      semver: 5.7.0
+  /node-modules-regexp/1.0.0:
     dev: true
+    engines:
+      node: '>=0.10.0'
     resolution:
-      integrity: sha512-uq1iL79YjfYC0WXoHbC/z28q/9pOl8kSHaXdWmAAc8No+bDwqkZbzIJz55g/MUsPgSGm9LZ7QSUbzTcH5tz47w==
+      integrity: sha1-jZ2+KJZKSsVxLpExZCEHxx6Q7EA=
   /normalize-package-data/2.5.0:
     dependencies:
       hosted-git-info: 2.7.1
@@ -1972,6 +2147,12 @@ packages:
     dev: false
     resolution:
       integrity: sha512-GJzfBZ6DgDAmnuaM3104jR4s1Myxr3Y3zfIyN4z3UdqN69oSRacNK8UhnobDdC+7J2AHCjGwxQubNJfE70SXXQ==
+  /object-keys/1.1.1:
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==
   /object-visit/1.0.1:
     dependencies:
       isobject: 3.0.1
@@ -1980,6 +2161,17 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-95xEk68MU3e1n+OdOV5BBC3QRbs=
+  /object.fromentries/2.0.0:
+    dependencies:
+      define-properties: 1.1.3
+      es-abstract: 1.13.0
+      function-bind: 1.1.1
+      has: 1.0.3
+    dev: true
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-9iLiI6H083uiqUuvzyY6qrlmc/Gz8hLQFOcb/Ri/0xXFkSNS3ctV+CbE6yM2+AnkYfOB3dGjdzC0wrMLIhQICA==
   /object.pick/1.3.0:
     dependencies:
       isobject: 3.0.1
@@ -2130,6 +2322,10 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ=
+  /path-dirname/1.0.2:
+    dev: true
+    resolution:
+      integrity: sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=
   /path-exists/3.0.0:
     dev: true
     engines:
@@ -2142,10 +2338,6 @@ packages:
       node: '>=0.10.0'
     resolution:
       integrity: sha1-F0uSaHNVNP+8es5r9TpanhtcX18=
-  /path-is-inside/1.0.2:
-    dev: true
-    resolution:
-      integrity: sha1-NlQX3t5EQw0cEa9hAn+s8HS9/FM=
   /path-key/2.0.1:
     dev: true
     engines:
@@ -2182,6 +2374,14 @@ packages:
       node: '>=6'
     resolution:
       integrity: sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==
+  /pirates/4.0.1:
+    dependencies:
+      node-modules-regexp: 1.0.0
+    dev: true
+    engines:
+      node: '>= 6'
+    resolution:
+      integrity: sha512-WuNqLTbMI3tmfef2TKxlQmAiLHKtFhlsCZnPIpuv2Ow0RDVO8lfy1Opf4NUzlMXLjPl+Men7AuVdX6TA+s+uGA==
   /pkg-dir/3.0.0:
     dependencies:
       find-up: 3.0.0
@@ -2247,6 +2447,14 @@ packages:
       node: '>=0.4.0'
     resolution:
       integrity: sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==
+  /prop-types/15.7.2:
+    dependencies:
+      loose-envify: 1.4.0
+      object-assign: 4.1.1
+      react-is: 16.8.6
+    dev: true
+    resolution:
+      integrity: sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==
   /pseudomap/1.0.2:
     dev: true
     resolution:
@@ -2268,6 +2476,33 @@ packages:
     dev: true
     resolution:
       integrity: sha1-+p4xn/3u6zWycpbvDz03TawvUqc=
+  /react-is/16.8.6:
+    dev: true
+    resolution:
+      integrity: sha512-aUk3bHfZ2bRSVFFbbeVS4i+lNPZr3/WM5jT2J5omUVV1zzcs1nAaf3l51ctA5FFvCRbhrH0bdAsRRQddFJZPtA==
+  /react-test-renderer/16.8.6_react@16.8.6:
+    dependencies:
+      object-assign: 4.1.1
+      prop-types: 15.7.2
+      react: 16.8.6
+      react-is: 16.8.6
+      scheduler: 0.13.6
+    dev: true
+    peerDependencies:
+      react: ^16.0.0
+    resolution:
+      integrity: sha512-H2srzU5IWYT6cZXof6AhUcx/wEyJddQ8l7cLM/F7gDXYyPr4oq+vCIxJYXVGhId1J706sqziAjuOEjyNkfgoEw==
+  /react/16.8.6:
+    dependencies:
+      loose-envify: 1.4.0
+      object-assign: 4.1.1
+      prop-types: 15.7.2
+      scheduler: 0.13.6
+    dev: true
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha512-pC0uMkhLaHm11ZSJULfOBqV4tIZkx87ZLvbbQYunNixAAvjnC+snJCg0XQXn9VIsttVsbZP/H/ewzgsd5fxKXw==
   /read-pkg-up/4.0.0:
     dependencies:
       find-up: 3.0.0
@@ -2329,10 +2564,6 @@ packages:
       node: '>= 0.10'
     resolution:
       integrity: sha1-hSBLVNuoLVdC4oyWdW70OvUOM4Q=
-  /regenerator-runtime/0.13.2:
-    dev: true
-    resolution:
-      integrity: sha512-S/TQAZJO+D3m9xeN1WTI8dLKBBiRgXBlTJvbWjCThHWZj9EvHK70Ff50/tYj2J/fvBY6JtFVwRuazHN2E7M9BA==
   /regex-not/1.0.2:
     dependencies:
       extend-shallow: 3.0.2
@@ -2403,6 +2634,12 @@ packages:
     dev: true
     resolution:
       integrity: sha512-WL2pBDjqT6pGUNSUzMw00o4T7If+z4H2x3Gz893WoUQ5KW8Vr9txp00ykiP16VBaZF5+j/OcXJHZ9+PCvdiDKw==
+  /resolve/1.11.1:
+    dependencies:
+      path-parse: 1.0.6
+    dev: true
+    resolution:
+      integrity: sha512-vIpgF6wfuJOZI7KKKSP+HmiKggadPQAdsp5HiC1mvqnfp0gF1vdwgBWZIdrVft9pgqoMFQN+R7BSWZiBxx+BBw==
   /restore-cursor/2.0.0:
     dependencies:
       onetime: 2.0.1
@@ -2472,6 +2709,13 @@ packages:
     dev: true
     resolution:
       integrity: sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
+  /scheduler/0.13.6:
+    dependencies:
+      loose-envify: 1.4.0
+      object-assign: 4.1.1
+    dev: true
+    resolution:
+      integrity: sha512-IWnObHt413ucAYKsD9J1QShUKkbKLQQHdxRyw73sw4FN26iWr3DY/H34xGPe4nmL1DwXyWmSWmMrA9TfQbE/XQ==
   /semver/5.7.0:
     dev: true
     hasBin: true
@@ -2592,6 +2836,13 @@ packages:
     dev: true
     resolution:
       integrity: sha512-MjqsvNwyz1s0k81Goz/9vRBe9SZdB09Bdw+/zYyO+3CuPk6fouTaxscHkgtE8jKvf01kVfl8riHzERQ/kefaSA==
+  /source-map-support/0.5.12:
+    dependencies:
+      buffer-from: 1.1.1
+      source-map: 0.6.1
+    dev: true
+    resolution:
+      integrity: sha512-4h2Pbvyy15EE02G+JOZpUCmqWJuqrs+sEkzewTm++BPi7Hvn/HwcqLAcNxYAyI0x13CpPPn+kMjl+hplXMHITQ==
   /source-map-url/0.4.0:
     dev: true
     resolution:
@@ -3130,18 +3381,23 @@ packages:
     resolution:
       integrity: sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==
 specifiers:
+  '@babel/core': 7.4.5
+  '@babel/plugin-transform-react-jsx': 7.3.0
+  '@babel/register': 7.4.4
   commitizen: 3.1.1
   concat-stream: 2.0.0
   cz-conventional-changelog: 2.1.0
-  eslint: 5.16.0
+  eslint: 6.0.0
   eslint-config-prettier: 5.0.0
-  eslint-plugin-compat: 3.1.2
+  eslint-plugin-react: 7.13.0
   fast-deep-equal: 2.0.1
   fast-glob: 3.0.1
   minimist: 1.2.0
   nyc: 14.1.1
   object-inspect: 1.6.0
   prettier: 1.18.2
+  react: 16.8.6
+  react-test-renderer: 16.8.6
   stack-utils: 1.0.2
   stream-spec: 0.3.6
   tap-color: 1.1.0
diff --git a/src/__tests__/__snapshots__/snapshot.test.jsx.snap b/src/__tests__/__snapshots__/snapshot.test.jsx.snap
new file mode 100644
index 0000000..50ccf1b
--- /dev/null
+++ b/src/__tests__/__snapshots__/snapshot.test.jsx.snap
@@ -0,0 +1,18 @@
+{
+  "toMatchSnapshot, Given an object: should match a specific snapshot": {
+    "id": 1,
+    "name": "Mary"
+  },
+  "toMatchSnapshot, Given a different object: should match a specific snapshot": {
+    "id": 2,
+    "name": "Martin",
+    "active": true
+  },
+  "toMatchSnapshot, Given a React component: should match a specific snapshot": {
+    "type": "div",
+    "props": {},
+    "children": [
+      "Hello World"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/src/__tests__/runner.test.js b/src/__tests__/runner.test.js
index 90dae10..336d822 100644
--- a/src/__tests__/runner.test.js
+++ b/src/__tests__/runner.test.js
@@ -41,4 +41,35 @@ describe("runner", async assert => {
     }),
     expected: new Error("check() in execute() didn't match: true with false")
   });
+
+  assert({
+    given: "a promise",
+    should: "resolve",
+    actual: await execute(() => {
+      return Promise.resolve(23);
+    }),
+    expected: 23
+  });
+
+  assert({
+    given: "user object",
+    should: "have the correct user id and structure",
+    actual: await execute(check => {
+      const user = { id: 1, name: "Helga" };
+
+      check(user, { id: 1, name: "Helga" });
+
+      return user.id;
+    }),
+    expected: 1
+  });
+});
+
+describe("multiple describe in one file", async assert => {
+  assert({
+    given: "some string concatenation",
+    should: "resolve to the string",
+    actual: "Hello" + " " + "World",
+    expected: "Hello World"
+  });
 });
diff --git a/src/__tests__/snapshot.test.jsx b/src/__tests__/snapshot.test.jsx
new file mode 100644
index 0000000..9d2c495
--- /dev/null
+++ b/src/__tests__/snapshot.test.jsx
@@ -0,0 +1,27 @@
+const React = require("react");
+const renderer = require("react-test-renderer");
+
+const { describe, toMatchSnapshot } = require("../runner");
+
+describe("toMatchSnapshot", async assert => {
+  assert({
+    given: "an object",
+    should: "match a specific snapshot",
+    actual: { id: 1, name: "Mary" },
+    expected: toMatchSnapshot()
+  });
+
+  assert({
+    given: "a different object",
+    should: "match a specific snapshot",
+    actual: { id: 2, name: "Martin", active: true },
+    expected: toMatchSnapshot()
+  });
+
+  assert({
+    given: "a React component",
+    should: "match a specific snapshot",
+    actual: renderer.create(<div>Hello World</div>).toJSON(),
+    expected: toMatchSnapshot()
+  });
+});
diff --git a/src/cli.js b/src/cli.js
index 8a5f23b..962a827 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -3,11 +3,13 @@
 const glob = require("fast-glob");
 const parseOpts = require("minimist");
 const { resolve } = require("path");
+const { unlinkSync } = require("fs");
 
 const opts = parseOpts(process.argv.slice(2), {
-  alias: { r: "require" },
+  alias: { r: "require", u: "update-snapshot" },
   string: "require",
-  default: { r: [] }
+  boolean: "updateSnapshot",
+  default: { r: [], u: false }
 });
 
 const cwd = process.cwd();
@@ -24,6 +26,12 @@ opts.require.forEach(module => {
   }
 });
 
+if (opts["updateSnapshot"]) {
+  const snapshotFiles = glob.sync(`${process.cwd()}/**/*.snap`);
+
+  snapshotFiles.forEach(unlinkSync);
+}
+
 opts._.forEach(arg => {
   const files = glob.sync(arg).map(String);
 
diff --git a/src/runner.js b/src/runner.js
index 2fd4165..e7bd4dc 100644
--- a/src/runner.js
+++ b/src/runner.js
@@ -1,4 +1,6 @@
 const deepEqual = require("fast-deep-equal");
+const fs = require("fs");
+const path = require("path");
 
 const createDefaultStream = require("./default-stream");
 const duplexStream = require("./duplex-stream");
@@ -7,6 +9,8 @@ const messaging = require("./messaging");
 const Results = require("./results");
 const Test = require("./test");
 
+const FS_OPTIONS = { encoding: "utf8" };
+
 function createExitHarness(conf = {}) {
   const harness = createHarness();
   const stream = harness.createStream();
@@ -106,10 +110,70 @@ function catchPromise(value) {
   return isPromise(value) ? catchAndReturn(value) : value;
 }
 
-function resolveSnapshot(name) {
-  const obj = {};
+function getTestFile() {
+  const originalFunc = Error.prepareStackTrace;
+  let callerFile;
+
+  try {
+    const err = new Error();
+
+    Error.prepareStackTrace = (_, stack) => stack;
+
+    const currentFile = err.stack.shift().getFileName();
+
+    while (err.stack.length) {
+      callerFile = err.stack.shift().getFileName();
+
+      if (currentFile !== callerFile) {
+        break;
+      }
+    }
+  } catch (e) {
+    // Ignore exception
+  }
+
+  Error.prepareStackTrace = originalFunc;
+
+  return callerFile;
+}
+
+function writeFormattedObjectFile(file, obj) {
+  const data = JSON.stringify(obj, null, 2);
+
+  fs.writeFileSync(file, data, FS_OPTIONS);
+}
+
+function readFormattedObjectFile(file) {
+  return JSON.parse(fs.readFileSync(file, FS_OPTIONS));
+}
+
+function resolveSnapshot(name, value) {
+  const testFile = getTestFile();
+  const snapshotDir = `${path.dirname(testFile)}${path.sep}__snapshots__`;
+  const snapshotFile = `${snapshotDir}${path.sep}${path.basename(
+    testFile
+  )}.snap`;
+
+  if (!fs.existsSync(snapshotDir)) {
+    fs.mkdirSync(snapshotDir);
+  }
+
+  if (!fs.existsSync(snapshotFile)) {
+    writeFormattedObjectFile(snapshotFile, { [name]: value });
+
+    return value;
+  }
+
+  const snapshots = readFormattedObjectFile(snapshotFile);
+
+  if (!snapshots[name]) {
+    snapshots[name] = value;
+    writeFormattedObjectFile(snapshotFile, snapshots);
+
+    return value;
+  }
 
-  return obj[name];
+  return snapshots[name];
 }
 
 function isValidTestDescriptor(descriptor) {
@@ -142,7 +206,7 @@ function createAssert(description, test) {
     if (expected === resolveSnapshot) {
       test.deepEqual(
         actual,
-        resolveSnapshot(`${description}, ${message}`),
+        resolveSnapshot(`${description}, ${message}`, actual),
         message
       );
       return;
@@ -155,9 +219,9 @@ function createAssert(description, test) {
 function check(a, b) {
   if (!deepEqual(a, b)) {
     throw new Error(
-      `check() in execute() didn't match: ${inspectObject(
+      `check() in execute() didn't match:\n${inspectObject(
         a
-      )} with ${inspectObject(b)}`
+      )}\nwith:\n${inspectObject(b)}`
     );
   }
 }
@@ -187,7 +251,7 @@ function describe(description, unit) {
  *
  * @public
  * @param {Function} fn Execution wrapper
- * @returns {Promise<any>} Returns resolved return value or thrown error
+ * @returns {Promise<*>} Returns resolved return value or thrown error
  */
 async function execute(fn) {
   try {