6 files changed, 1683 insertions, 6 deletions

diff --git a/.eslintrc b/.eslintrc
index e61d99c20..c85bee1fa 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,6 +1,7 @@
 {
   "parser": "babel-eslint",
   "extends": "eslint-config-airbnb",
+  "plugins": ["jest"],
   "rules": {
     "consistent-return": 0,
     "no-param-reassign": 0,
@@ -55,5 +56,8 @@
     "btoa": true,
     "ga": true,
     "mocha": true
+  },
+  "env": {
+    "jest/globals": true
   }
 }
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 000000000..8c9b59cf5
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,3 @@
+module.exports = {
+  roots: ['src'],
+};
diff --git a/package-lock.json b/package-lock.json
index ab505e904..cd43fcda6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1083,6 +1083,16 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@cnakazawa/watch": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@cnakazawa/watch/-/watch-1.0.3.tgz",
+      "integrity": "sha512-r5160ogAvGyHsal38Kux7YYtodEKOj89RGb28ht1jh3SJb08VwRwAKKJL0bGb04Zd/3r9FL3BFIc3bBidYffCA==",
+      "dev": true,
+      "requires": {
+        "exec-sh": "^0.3.2",
+        "minimist": "^1.2.0"
+      }
+    },
     "@fimbul/bifrost": {
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/@fimbul/bifrost/-/bifrost-0.17.0.tgz",
@@ -1123,6 +1133,217 @@
         "tslib": "^1.8.1"
       }
     },
+    "@jest/console": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.7.1.tgz",
+      "integrity": "sha512-iNhtIy2M8bXlAOULWVTUxmnelTLFneTNEkHCgPmgd+zNwy9zVddJ6oS5rZ9iwoscNdT5mMwUd0C51v/fSlzItg==",
+      "dev": true,
+      "requires": {
+        "@jest/source-map": "^24.3.0",
+        "chalk": "^2.0.1",
+        "slash": "^2.0.0"
+      }
+    },
+    "@jest/core": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/core/-/core-24.7.1.tgz",
+      "integrity": "sha512-ivlZ8HX/FOASfHcb5DJpSPFps8ydfUYzLZfgFFqjkLijYysnIEOieg72YRhO4ZUB32xu40hsSMmaw+IGYeKONA==",
+      "dev": true,
+      "requires": {
+        "@jest/console": "^24.7.1",
+        "@jest/reporters": "^24.7.1",
+        "@jest/test-result": "^24.7.1",
+        "@jest/transform": "^24.7.1",
+        "@jest/types": "^24.7.0",
+        "ansi-escapes": "^3.0.0",
+        "chalk": "^2.0.1",
+        "exit": "^0.1.2",
+        "graceful-fs": "^4.1.15",
+        "jest-changed-files": "^24.7.0",
+        "jest-config": "^24.7.1",
+        "jest-haste-map": "^24.7.1",
+        "jest-message-util": "^24.7.1",
+        "jest-regex-util": "^24.3.0",
+        "jest-resolve-dependencies": "^24.7.1",
+        "jest-runner": "^24.7.1",
+        "jest-runtime": "^24.7.1",
+        "jest-snapshot": "^24.7.1",
+        "jest-util": "^24.7.1",
+        "jest-validate": "^24.7.0",
+        "jest-watcher": "^24.7.1",
+        "micromatch": "^3.1.10",
+        "p-each-series": "^1.0.0",
+        "pirates": "^4.0.1",
+        "realpath-native": "^1.1.0",
+        "rimraf": "^2.5.4",
+        "strip-ansi": "^5.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "pirates": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pirates/-/pirates-4.0.1.tgz",
+          "integrity": "sha512-WuNqLTbMI3tmfef2TKxlQmAiLHKtFhlsCZnPIpuv2Ow0RDVO8lfy1Opf4NUzlMXLjPl+Men7AuVdX6TA+s+uGA==",
+          "dev": true,
+          "requires": {
+            "node-modules-regexp": "^1.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "@jest/environment": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-24.7.1.tgz",
+      "integrity": "sha512-wmcTTYc4/KqA+U5h1zQd5FXXynfa7VGP2NfF+c6QeGJ7c+2nStgh65RQWNX62SC716dTtqheTRrZl0j+54oGHw==",
+      "dev": true,
+      "requires": {
+        "@jest/fake-timers": "^24.7.1",
+        "@jest/transform": "^24.7.1",
+        "@jest/types": "^24.7.0",
+        "jest-mock": "^24.7.0"
+      }
+    },
+    "@jest/fake-timers": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-24.7.1.tgz",
+      "integrity": "sha512-4vSQJDKfR2jScOe12L9282uiwuwQv9Lk7mgrCSZHA9evB9efB/qx8i0KJxsAKtp8fgJYBJdYY7ZU6u3F4/pyjA==",
+      "dev": true,
+      "requires": {
+        "@jest/types": "^24.7.0",
+        "jest-message-util": "^24.7.1",
+        "jest-mock": "^24.7.0"
+      }
+    },
+    "@jest/reporters": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-24.7.1.tgz",
+      "integrity": "sha512-bO+WYNwHLNhrjB9EbPL4kX/mCCG4ZhhfWmO3m4FSpbgr7N83MFejayz30kKjgqr7smLyeaRFCBQMbXpUgnhAJw==",
+      "dev": true,
+      "requires": {
+        "@jest/environment": "^24.7.1",
+        "@jest/test-result": "^24.7.1",
+        "@jest/transform": "^24.7.1",
+        "@jest/types": "^24.7.0",
+        "chalk": "^2.0.1",
+        "exit": "^0.1.2",
+        "glob": "^7.1.2",
+        "istanbul-api": "^2.1.1",
+        "istanbul-lib-coverage": "^2.0.2",
+        "istanbul-lib-instrument": "^3.0.1",
+        "istanbul-lib-source-maps": "^3.0.1",
+        "jest-haste-map": "^24.7.1",
+        "jest-resolve": "^24.7.1",
+        "jest-runtime": "^24.7.1",
+        "jest-util": "^24.7.1",
+        "jest-worker": "^24.6.0",
+        "node-notifier": "^5.2.1",
+        "slash": "^2.0.0",
+        "source-map": "^0.6.0",
+        "string-length": "^2.0.0"
+      }
+    },
+    "@jest/source-map": {
+      "version": "24.3.0",
+      "resolved": "https://registry.npmjs.org/@jest/source-map/-/source-map-24.3.0.tgz",
+      "integrity": "sha512-zALZt1t2ou8le/crCeeiRYzvdnTzaIlpOWaet45lNSqNJUnXbppUUFR4ZUAlzgDmKee4Q5P/tKXypI1RiHwgag==",
+      "dev": true,
+      "requires": {
+        "callsites": "^3.0.0",
+        "graceful-fs": "^4.1.15",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "callsites": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+          "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+          "dev": true
+        }
+      }
+    },
+    "@jest/test-result": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/test-result/-/test-result-24.7.1.tgz",
+      "integrity": "sha512-3U7wITxstdEc2HMfBX7Yx3JZgiNBubwDqQMh+BXmZXHa3G13YWF3p6cK+5g0hGkN3iufg/vGPl3hLxQXD74Npg==",
+      "dev": true,
+      "requires": {
+        "@jest/console": "^24.7.1",
+        "@jest/types": "^24.7.0",
+        "@types/istanbul-lib-coverage": "^2.0.0"
+      }
+    },
+    "@jest/test-sequencer": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/test-sequencer/-/test-sequencer-24.7.1.tgz",
+      "integrity": "sha512-84HQkCpVZI/G1zq53gHJvSmhUer4aMYp9tTaffW28Ih5OxfCg8hGr3nTSbL1OhVDRrFZwvF+/R9gY6JRkDUpUA==",
+      "dev": true,
+      "requires": {
+        "@jest/test-result": "^24.7.1",
+        "jest-haste-map": "^24.7.1",
+        "jest-runner": "^24.7.1",
+        "jest-runtime": "^24.7.1"
+      }
+    },
+    "@jest/transform": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/transform/-/transform-24.7.1.tgz",
+      "integrity": "sha512-EsOUqP9ULuJ66IkZQhI5LufCHlTbi7hrcllRMUEV/tOgqBVQi93+9qEvkX0n8mYpVXQ8VjwmICeRgg58mrtIEw==",
+      "dev": true,
+      "requires": {
+        "@babel/core": "^7.1.0",
+        "@jest/types": "^24.7.0",
+        "babel-plugin-istanbul": "^5.1.0",
+        "chalk": "^2.0.1",
+        "convert-source-map": "^1.4.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "graceful-fs": "^4.1.15",
+        "jest-haste-map": "^24.7.1",
+        "jest-regex-util": "^24.3.0",
+        "jest-util": "^24.7.1",
+        "micromatch": "^3.1.10",
+        "realpath-native": "^1.1.0",
+        "slash": "^2.0.0",
+        "source-map": "^0.6.1",
+        "write-file-atomic": "2.4.1"
+      },
+      "dependencies": {
+        "write-file-atomic": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+          "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.11",
+            "imurmurhash": "^0.1.4",
+            "signal-exit": "^3.0.2"
+          }
+        }
+      }
+    },
+    "@jest/types": {
+      "version": "24.7.0",
+      "resolved": "https://registry.npmjs.org/@jest/types/-/types-24.7.0.tgz",
+      "integrity": "sha512-ipJUa2rFWiKoBqMKP63Myb6h9+iT3FHRTF2M8OR6irxWzItisa8i4dcSg14IbvmXUnBlHBlUQPYUHWyX3UPpYA==",
+      "dev": true,
+      "requires": {
+        "@types/istanbul-lib-coverage": "^2.0.0",
+        "@types/yargs": "^12.0.9"
+      }
+    },
     "@lerna/add": {
       "version": "3.11.0",
       "resolved": "https://registry.npmjs.org/@lerna/add/-/add-3.11.0.tgz",
@@ -2036,6 +2257,47 @@
         "url-template": "^2.0.8"
       }
     },
+    "@types/babel__core": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.1.1.tgz",
+      "integrity": "sha512-+hjBtgcFPYyCTo0A15+nxrCVJL7aC6Acg87TXd5OW3QhHswdrOLoles+ldL2Uk8q++7yIfl4tURtztccdeeyOw==",
+      "dev": true,
+      "requires": {
+        "@babel/parser": "^7.1.0",
+        "@babel/types": "^7.0.0",
+        "@types/babel__generator": "*",
+        "@types/babel__template": "*",
+        "@types/babel__traverse": "*"
+      }
+    },
+    "@types/babel__generator": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/babel__generator/-/babel__generator-7.0.2.tgz",
+      "integrity": "sha512-NHcOfab3Zw4q5sEE2COkpfXjoE7o+PmqD9DQW4koUT3roNxwziUdXGnRndMat/LJNUtePwn1TlP4do3uoe3KZQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@types/babel__template": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/babel__template/-/babel__template-7.0.2.tgz",
+      "integrity": "sha512-/K6zCpeW7Imzgab2bLkLEbz0+1JlFSrUMdw7KoIIu+IUdu51GWaBZpd3y1VXGVXzynvGa4DaIaxNZHiON3GXUg==",
+      "dev": true,
+      "requires": {
+        "@babel/parser": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@types/babel__traverse": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/@types/babel__traverse/-/babel__traverse-7.0.6.tgz",
+      "integrity": "sha512-XYVgHF2sQ0YblLRMLNPB3CkFMewzFmlDsH/TneZFHUXDlABQgh88uOxuez7ZcXxayLFrqLwtDH1t+FmlFwNZxw==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.3.0"
+      }
+    },
     "@types/classnames": {
       "version": "2.2.7",
       "resolved": "https://registry.npmjs.org/@types/classnames/-/classnames-2.2.7.tgz",
@@ -2066,6 +2328,12 @@
       "integrity": "sha512-gZ/Rb+MFXF0pXSEQxdRoPMm5jeO3TycjOdvbpbcpHX/B+n9AqaHFe5q6Ga9CsZ7ir/UgIWPfrBzUzn3F19VH/w==",
       "dev": true
     },
+    "@types/istanbul-lib-coverage": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.0.tgz",
+      "integrity": "sha512-eAtOAFZefEnfJiRFQBGw1eYqa5GTLCZ1y86N0XSI/D6EB+E8z6VPV/UL7Gi5UEclFqoQk+6NRqEDsfmDLXn8sg==",
+      "dev": true
+    },
     "@types/jss": {
       "version": "9.5.7",
       "resolved": "https://registry.npmjs.org/@types/jss/-/jss-9.5.7.tgz",
@@ -2125,6 +2393,12 @@
         "csstype": "^2.0.0"
       }
     },
+    "@types/stack-utils": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz",
+      "integrity": "sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==",
+      "dev": true
+    },
     "@types/theming": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/@types/theming/-/theming-1.3.2.tgz",
@@ -2143,6 +2417,12 @@
         "@types/node": "*"
       }
     },
+    "@types/yargs": {
+      "version": "12.0.12",
+      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-12.0.12.tgz",
+      "integrity": "sha512-SOhuU4wNBxhhTHxYaiG5NY4HBhDIDnJF60GU+2LqHAdKKer86//e4yg69aENCtQ04n0ovz+tq2YPME5t5yp4pw==",
+      "dev": true
+    },
     "@webassemblyjs/ast": {
       "version": "1.7.11",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.7.11.tgz",
@@ -2337,6 +2617,12 @@
         "through": ">=2.2.7 <3"
       }
     },
+    "abab": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.0.tgz",
+      "integrity": "sha512-sY5AXXVZv4Y1VACTtR11UJCPHHudgY5i26Qj5TypE6DKlIApbwb5uqhXcJ5UUGbvZNRh7EeIoW+LrJumBsKp7w==",
+      "dev": true
+    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -2384,12 +2670,28 @@
         }
       }
     },
+    "acorn-globals": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.3.1.tgz",
+      "integrity": "sha512-gJSiKY8dBIjV/0jagZIFBdVMtfQyA5QHCvAT48H2q8REQoW8Fs5AOjqBql1LgSXgrMWdevcE+8cdZ33NtVbIBA==",
+      "dev": true,
+      "requires": {
+        "acorn": "^6.0.1",
+        "acorn-walk": "^6.0.1"
+      }
+    },
     "acorn-jsx": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
       "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
       "dev": true
     },
+    "acorn-walk": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
+      "integrity": "sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==",
+      "dev": true
+    },
     "add-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/add-stream/-/add-stream-1.0.0.tgz",
@@ -2603,6 +2905,15 @@
         "buffer-equal": "^1.0.0"
       }
     },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
     "applescript": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/applescript/-/applescript-1.0.0.tgz",
@@ -2737,6 +3048,12 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "dev": true
     },
+    "array-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
+    },
     "array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
@@ -3115,6 +3432,21 @@
         "eslint-visitor-keys": "^1.0.0"
       }
     },
+    "babel-jest": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-24.7.1.tgz",
+      "integrity": "sha512-GPnLqfk8Mtt0i4OemjWkChi73A3ALs4w2/QbG64uAj8b5mmwzxc7jbJVRZt8NJkxi6FopVHog9S3xX6UJKb2qg==",
+      "dev": true,
+      "requires": {
+        "@jest/transform": "^24.7.1",
+        "@jest/types": "^24.7.0",
+        "@types/babel__core": "^7.1.0",
+        "babel-plugin-istanbul": "^5.1.0",
+        "babel-preset-jest": "^24.6.0",
+        "chalk": "^2.4.2",
+        "slash": "^2.0.0"
+      }
+    },
     "babel-loader": {
       "version": "8.0.5",
       "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-8.0.5.tgz",
@@ -3149,6 +3481,26 @@
         }
       }
     },
+    "babel-plugin-istanbul": {
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+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/prompts/-/prompts-2.0.4.tgz",
+      "integrity": "sha512-HTzM3UWp/99A0gk51gAegwo1QRYA7xjcZufMNe33rCclFszUYAuHe1fIN/3ZmiHeGPkUsNaRyQm1hHOfM0PKxA==",
+      "dev": true,
+      "requires": {
+        "kleur": "^3.0.2",
+        "sisteransi": "^1.0.0"
+      }
+    },
     "promzard": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/promzard/-/promzard-0.3.0.tgz",
@@ -15418,6 +16812,15 @@
         }
       }
     },
+    "realpath-native": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/realpath-native/-/realpath-native-1.1.0.tgz",
+      "integrity": "sha512-wlgPA6cCIIg9gKz0fgAPjnzh4yR/LnXovwuo9hvyGvx3h8nX4+/iLZplfUWasXpqD8BdnGnP5njOFjkUwPzvjA==",
+      "dev": true,
+      "requires": {
+        "util.promisify": "^1.0.0"
+      }
+    },
     "rechoir": {
       "version": "0.6.2",
       "resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.6.2.tgz",
@@ -15751,6 +17154,26 @@
         "uuid": "^3.3.2"
       }
     },
+    "request-promise-core": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/request-promise-core/-/request-promise-core-1.1.2.tgz",
+      "integrity": "sha512-UHYyq1MO8GsefGEt7EprS8UrXsm1TxEvFUX1IMTuSLU2Rh7fTIdFtl8xD7JiEYiWU2dl+NYAjCTksTehQUxPag==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.11"
+      }
+    },
+    "request-promise-native": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/request-promise-native/-/request-promise-native-1.0.7.tgz",
+      "integrity": "sha512-rIMnbBdgNViL37nZ1b3L/VfPOpSi0TqVDQPAvO6U14lMzOLrt5nilxCQqtDKhZeDiW0/hkCXGoQjhgJd/tCh6w==",
+      "dev": true,
+      "requires": {
+        "request-promise-core": "1.1.2",
+        "stealthy-require": "^1.1.1",
+        "tough-cookie": "^2.3.3"
+      }
+    },
     "require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -15887,6 +17310,12 @@
       "resolved": "https://registry.npmjs.org/route-parser/-/route-parser-0.0.5.tgz",
       "integrity": "sha1-fR0J0zXkkJQDHqFpkaSnmwG74fQ="
     },
+    "rsvp": {
+      "version": "4.8.4",
+      "resolved": "https://registry.npmjs.org/rsvp/-/rsvp-4.8.4.tgz",
+      "integrity": "sha512-6FomvYPfs+Jy9TfXmBpBuMWNH94SgCsZmJKcanySzgNNP6LjWxBvyLTa9KaMfDDM5oxRfrKDB0r/qeRsLwnBfA==",
+      "dev": true
+    },
     "run-async": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
@@ -15945,6 +17374,23 @@
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
+    "sane": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/sane/-/sane-4.1.0.tgz",
+      "integrity": "sha512-hhbzAgTIX8O7SHfp2c8/kREfEn4qO/9q8C9beyY6+tvZ87EpoZ3i1RIEvp27YBswnNbY9mWd6paKVmKbAgLfZA==",
+      "dev": true,
+      "requires": {
+        "@cnakazawa/watch": "^1.0.3",
+        "anymatch": "^2.0.0",
+        "capture-exit": "^2.0.0",
+        "exec-sh": "^0.3.2",
+        "execa": "^1.0.0",
+        "fb-watchman": "^2.0.0",
+        "micromatch": "^3.1.4",
+        "minimist": "^1.1.1",
+        "walker": "~1.0.5"
+      }
+    },
     "sanitize-filename": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/sanitize-filename/-/sanitize-filename-1.6.1.tgz",
@@ -16408,6 +17854,12 @@
       "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
       "dev": true
     },
+    "shellwords": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/shellwords/-/shellwords-0.1.1.tgz",
+      "integrity": "sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==",
+      "dev": true
+    },
     "sigmund": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz",
@@ -16472,6 +17924,12 @@
         }
       }
     },
+    "sisteransi": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/sisteransi/-/sisteransi-1.0.0.tgz",
+      "integrity": "sha512-N+z4pHB4AmUv0SjveWRd6q1Nj5w62m5jodv+GD8lvmbY/83T/rpbJGZOnK5T149OldDj4Db07BSv9xY4K6NTPQ==",
+      "dev": true
+    },
     "slash": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
@@ -17080,6 +18538,12 @@
       "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA=",
       "dev": true
     },
+    "stack-utils": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-1.0.2.tgz",
+      "integrity": "sha512-MTX+MeG5U994cazkjd/9KNAapsHnibjMLnfXodlkXw76JEea0UiNzrqidzo1emMwk7w5Qhc9jd4Bn9TBb1MFwA==",
+      "dev": true
+    },
     "stat-mode": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/stat-mode/-/stat-mode-0.2.2.tgz",
@@ -17148,6 +18612,12 @@
         }
       }
     },
+    "stealthy-require": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
+      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=",
+      "dev": true
+    },
     "stream-browserify": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.2.tgz",
@@ -17250,6 +18720,16 @@
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
     },
+    "string-length": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/string-length/-/string-length-2.0.0.tgz",
+      "integrity": "sha1-1A27aGo6zpYMHP/KVivyxF+DY+0=",
+      "dev": true,
+      "requires": {
+        "astral-regex": "^1.0.0",
+        "strip-ansi": "^4.0.0"
+      }
+    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -17343,6 +18823,12 @@
       "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.2.0.tgz",
       "integrity": "sha512-e900nM8RRtGhlV36KGEU9k65K3mPb1WV70OdjfxlG2EAuM1noi/E/BaW/uMhL7bPEssK8QV57vN3esixjUvcXQ=="
     },
+    "symbol-tree": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.2.tgz",
+      "integrity": "sha1-rifbOPZgp64uHDt9G8KQgZuFGeY=",
+      "dev": true
+    },
     "table": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/table/-/table-5.2.3.tgz",
@@ -17552,6 +19038,47 @@
         }
       }
     },
+    "test-exclude": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.2.tgz",
+      "integrity": "sha512-N2pvaLpT8guUpb5Fe1GJlmvmzH3x+DAKmmyEQmFP792QcLYoGE1syxztSvPD1V8yPe6VrcCt6YGQVjSRjCASsA==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.3",
+        "minimatch": "^3.0.4",
+        "read-pkg-up": "^4.0.0",
+        "require-main-filename": "^2.0.0"
+      },
+      "dependencies": {
+        "read-pkg": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
+          "integrity": "sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=",
+          "dev": true,
+          "requires": {
+            "load-json-file": "^4.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^3.0.0"
+          }
+        },
+        "read-pkg-up": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-4.0.0.tgz",
+          "integrity": "sha512-6etQSH7nJGsK0RbG/2TeDzZFa8shjQ1um+SwQQ5cwKy0dhSXdOncEhb1CPpvQG4h7FyOV6EB6YlV0yJvZQNAkA==",
+          "dev": true,
+          "requires": {
+            "find-up": "^3.0.0",
+            "read-pkg": "^3.0.0"
+          }
+        },
+        "require-main-filename": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+          "dev": true
+        }
+      }
+    },
     "text-extensions": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/text-extensions/-/text-extensions-1.9.0.tgz",
@@ -17575,6 +19102,12 @@
         "prop-types": "^15.5.8"
       }
     },
+    "throat": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/throat/-/throat-4.1.0.tgz",
+      "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
+      "dev": true
+    },
     "throttleit": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-0.0.2.tgz",
@@ -17678,6 +19211,12 @@
         "os-tmpdir": "~1.0.2"
       }
     },
+    "tmpl": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
+      "integrity": "sha1-I2QN17QtAEM5ERQIIOXPRA5SHdE=",
+      "dev": true
+    },
     "to-absolute-glob": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/to-absolute-glob/-/to-absolute-glob-2.0.2.tgz",
@@ -18614,6 +20153,15 @@
         "indexof": "0.0.1"
       }
     },
+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
     "wait-on": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/wait-on/-/wait-on-3.2.0.tgz",
@@ -18672,6 +20220,15 @@
         }
       }
     },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
     "warning": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/warning/-/warning-3.0.0.tgz",
@@ -19072,11 +20629,26 @@
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
     "whatwg-fetch": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-3.0.0.tgz",
       "integrity": "sha512-9GSJUgz1D4MfyKU7KRqwOjXCXTqWdFNvEr7eUBYchQiVc744mqK/MzXPNR2WsPkmkOa4ywfg8C2n8h+13Bey1Q=="
     },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
     "whatwg-url": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.0.0.tgz",
@@ -19349,6 +20921,12 @@
       "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
       "dev": true
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xmlbuilder": {
       "version": "9.0.7",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
diff --git a/package.json b/package.json
index 948e4b6cc..ab1d72751 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,8 @@
     "start:local": "cross-env LOCAL_API=1 npm start",
     "start:live": "cross-env LIVE_API=1 npm start",
     "dev": "cross-env NODE_ENV=development gulp dev",
+    "test": "jest",
+    "test:watch": "jest --watch",
     "lint": "eslint src",
     "manage-translations": "node ./src/i18n/manage-translations.js",
     "sign": "gulp sign",
@@ -122,6 +124,7 @@
     "eslint-config-airbnb": "17.1.0",
     "eslint-loader": "^1.9.0",
     "eslint-plugin-import": "2.14.0",
+    "eslint-plugin-jest": "22.4.1",
     "eslint-plugin-jsx-a11y": "6.1.2",
     "eslint-plugin-react": "7.11.1",
     "expect.js": "0.3.1",
@@ -134,6 +137,7 @@
     "hex-rgb": "3.0.0",
     "html-webpack-plugin": "4.0.0-beta.5",
     "husky": "^1.1.4",
+    "jest": "24.7.1",
     "kebab-case": "1.0.0",
     "lerna": "^3.8.0",
     "mobx-react-devtools": "6.0.3",
diff --git a/src/features/utils/FeatureStore.js b/src/features/utils/FeatureStore.js
index b6e0fbce3..0bc10e176 100644
--- a/src/features/utils/FeatureStore.js
+++ b/src/features/utils/FeatureStore.js
@@ -1,9 +1,7 @@
-import { union } from 'lodash';
-
 export class FeatureStore {
-  _actions = null;
+  _actions = [];
 
-  _reactions = null;
+  _reactions = [];
 
   stop() {
     this._stopActions();
@@ -13,7 +11,7 @@ export class FeatureStore {
   // ACTIONS
 
   _registerActions(actions) {
-    this._actions = union(this._actions, actions);
+    this._actions = actions;
     this._startActions();
   }
 
@@ -28,7 +26,7 @@ export class FeatureStore {
   // REACTIONS
 
   _registerReactions(reactions) {
-    this._reactions = union(this._reactions, reactions);
+    this._reactions = reactions;
     this._startReactions();
   }
 
diff --git a/src/features/utils/FeatureStore.test.js b/src/features/utils/FeatureStore.test.js
new file mode 100644
index 000000000..b618b0a14
--- /dev/null
+++ b/src/features/utils/FeatureStore.test.js
@@ -0,0 +1,90 @@
+import PropTypes from 'prop-types';
+import { observable } from 'mobx';
+import { FeatureStore } from './FeatureStore';
+import { createActionsFromDefinitions } from '../../actions/lib/actions';
+
+const actions = createActionsFromDefinitions({
+  countUp: {},
+}, PropTypes.checkPropTypes);
+
+class TestFeatureStore extends FeatureStore {
+  @observable count = 0;
+
+  reactionInvokedCount = 0;
+
+  start() {
+    this._registerActions([
+      [actions.countUp, this._countUp],
+    ]);
+    this._registerReactions([
+      this._countReaction,
+    ]);
+  }
+
+  _countUp = () => {
+    this.count += 1;
+  };
+
+  _countReaction = () => {
+    this.reactionInvokedCount += 1;
+  }
+}
+
+describe('FeatureStore', () => {
+  let store = null;
+
+  beforeEach(() => {
+    store = new TestFeatureStore();
+  });
+
+  describe('registering actions', () => {
+    it('starts the actions', () => {
+      store.start();
+      actions.countUp();
+      expect(store.count).toBe(1);
+    });
+    it('starts the reactions', () => {
+      store.start();
+      actions.countUp();
+      expect(store.reactionInvokedCount).toBe(1);
+    });
+  });
+
+  describe('stopping the store', () => {
+    it('stops the actions', () => {
+      store.start();
+      actions.countUp();
+      store.stop();
+      actions.countUp();
+      expect(store.count).toBe(1);
+    });
+    it('stops the reactions', () => {
+      store.start();
+      actions.countUp();
+      store.stop();
+      store.count += 1;
+      expect(store.reactionInvokedCount).toBe(1);
+    });
+  });
+
+  describe('toggling the store', () => {
+    it('restarts the actions correctly', () => {
+      store.start();
+      actions.countUp();
+      store.stop();
+      actions.countUp();
+      store.start();
+      actions.countUp();
+      expect(store.count).toBe(2);
+    });
+    it('restarts the reactions correctly', () => {
+      store.start();
+      actions.countUp();
+      store.stop();
+      actions.countUp();
+      store.start();
+      actions.countUp();
+      expect(store.count).toBe(2);
+    });
+  });
+});