diff --git a/.gitignore b/.gitignore
index 2fb38a53..065997ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,7 @@ types/
 cache/
 artifacts/
 build/
+
+# Test coverage
+coverage
+coverage.json
diff --git a/.solcover.js b/.solcover.js
new file mode 100644
index 00000000..fa22b22e
--- /dev/null
+++ b/.solcover.js
@@ -0,0 +1,10 @@
+const shell = require("shelljs"); // From solidity-coverage
+
+module.exports = {
+    skipFiles: ["./test", "./deployment"],
+    onCompileComplete: async _config => {
+        shell.exec(
+            "typechain --target ethers-v5 './artifacts/contracts/**/!(*.dbg).json'"
+        );
+    }
+};
diff --git a/hardhat.config.ts b/hardhat.config.ts
index abcd6a61..8068d5cb 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -1,4 +1,5 @@
 import "@nomiclabs/hardhat-ethers";
+import "solidity-coverage";
 
 module.exports = {
     defaultNetwork: "hardhat",
diff --git a/package-lock.json b/package-lock.json
index c840c93e..d086f274 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -600,6 +600,32 @@
         "ipaddr.js": "^2.0.0"
       }
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz",
+      "integrity": "sha512-33g3pMJk3bg5nXbL/+CY6I2eJDzZAni49PfJnL5fghPTggPvBd/pFNSgJsdAgWptuFu7qq/ERvOYFlhvsLTCKA==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.4",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.4.tgz",
+      "integrity": "sha512-IYlHJA0clt2+Vg7bccq+TzRdJvv19c2INqBSsoOLp1je7xjtr7J26+WXR72MCdvU9q1qTzIWDfhMf+DRvQJK4Q==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.6.tgz",
+      "integrity": "sha512-8Broas6vTtW4GIXTAHDoE32hnN2M5ykgCpWGbuXHQ15vEMqr23pB76e/GZcYsZCHALv50ktd24qhEyKr6wBtow==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.4",
+        "fastq": "^1.6.0"
+      }
+    },
     "@nomiclabs/hardhat-ethers": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.2.tgz",
@@ -693,12 +719,139 @@
         "tslib": "^1.9.3"
       }
     },
+    "@sindresorhus/is": {
+      "version": "0.14.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==",
+      "dev": true
+    },
     "@solidity-parser/parser": {
       "version": "0.11.1",
       "resolved": "https://registry.npmjs.org/@solidity-parser/parser/-/parser-0.11.1.tgz",
       "integrity": "sha512-H8BSBoKE8EubJa0ONqecA2TviT3TnHeC4NpgnAHSUiuhZoQBfPB4L2P9bs8R6AoTW10Endvh3vc+fomVMIDIYQ==",
       "dev": true
     },
+    "@szmarczak/http-timer": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
+      "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
+      "dev": true,
+      "requires": {
+        "defer-to-connect": "^1.0.1"
+      }
+    },
+    "@truffle/error": {
+      "version": "0.0.12",
+      "resolved": "https://registry.npmjs.org/@truffle/error/-/error-0.0.12.tgz",
+      "integrity": "sha512-kZqqnPR9YDJG7KCDOcN1qH16Qs0oz1PzF0Y93AWdhXuL9S9HYo/RUUeqGKbPpRBEZldQUS8aa4EzfK08u5pu6g==",
+      "dev": true
+    },
+    "@truffle/interface-adapter": {
+      "version": "0.4.21",
+      "resolved": "https://registry.npmjs.org/@truffle/interface-adapter/-/interface-adapter-0.4.21.tgz",
+      "integrity": "sha512-uGU9T0a1S1f1xiTrNksd9ba+55SyU9jaCLNauFGOtppWDmjHD7dorxncEyj7lM9dcKl+w8Y+wHy79bb/LG4XFQ==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^5.1.3",
+        "ethers": "^4.0.32",
+        "web3": "1.3.5"
+      },
+      "dependencies": {
+        "elliptic": {
+          "version": "6.5.3",
+          "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
+          "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
+          "dev": true,
+          "requires": {
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.0"
+          },
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+              "dev": true
+            }
+          }
+        },
+        "ethers": {
+          "version": "4.0.48",
+          "resolved": "https://registry.npmjs.org/ethers/-/ethers-4.0.48.tgz",
+          "integrity": "sha512-sZD5K8H28dOrcidzx9f8KYh8083n5BexIO3+SbE4jK83L85FxtpXZBCQdXb8gkg+7sBqomcLhhkU7UHL+F7I2g==",
+          "dev": true,
+          "requires": {
+            "aes-js": "3.0.0",
+            "bn.js": "^4.4.0",
+            "elliptic": "6.5.3",
+            "hash.js": "1.1.3",
+            "js-sha3": "0.5.7",
+            "scrypt-js": "2.0.4",
+            "setimmediate": "1.0.4",
+            "uuid": "2.0.1",
+            "xmlhttprequest": "1.8.0"
+          },
+          "dependencies": {
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+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+              "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+              "dev": true
+            }
+          }
+        },
+        "hash.js": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/hash.js/-/hash.js-1.1.3.tgz",
+          "integrity": "sha512-/UETyP0W22QILqS+6HowevwhEFJ3MBJnwTf75Qob9Wz9t0DPuisL8kW8YZMK62dHAKE1c1p+gY1TtOLY+USEHA==",
+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "minimalistic-assert": "^1.0.0"
+          }
+        },
+        "js-sha3": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.7.tgz",
+          "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc=",
+          "dev": true
+        },
+        "scrypt-js": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-2.0.4.tgz",
+          "integrity": "sha512-4KsaGcPnuhtCZQCxFxN3GVYIhKFPTdLd8PLC552XwbMndtD0cjRFAhDuuydXQ0h08ZfPgzqe6EKHozpuH74iDw==",
+          "dev": true
+        },
+        "setimmediate": {
+          "version": "1.0.4",
+          "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.4.tgz",
+          "integrity": "sha1-IOgd5iLUoCWIzgyNqJc8vPHTE48=",
+          "dev": true
+        },
+        "uuid": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
+          "integrity": "sha1-wqMN7bPlNdcsz4LjQ5QaULqFM6w=",
+          "dev": true
+        }
+      }
+    },
+    "@truffle/provider": {
+      "version": "0.2.28",
+      "resolved": "https://registry.npmjs.org/@truffle/provider/-/provider-0.2.28.tgz",
+      "integrity": "sha512-lowQkQPVSnn1jG3JIrp5iTDxkHZErjjjbLsvpI1kd8sYQ5LcGorgPQVsGlhM5BfYUQCeHLeFwwFb0ghx3hisKw==",
+      "dev": true,
+      "requires": {
+        "@truffle/error": "^0.0.12",
+        "@truffle/interface-adapter": "^0.4.21",
+        "web3": "1.3.5"
+      }
+    },
     "@typechain/ethers-v5": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@typechain/ethers-v5/-/ethers-v5-1.0.0.tgz",
@@ -729,6 +882,16 @@
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       "dev": true
     },
+    "@types/glob": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
+      "integrity": "sha512-SEYeGAIQIQX8NN6LDKprLjbrd5dARM5EXsd8GI/A5l0apYI1fGMWgPHSe4ZKL4eozlAyI+doUE9XbYS4xCkQ1w==",
+      "dev": true,
+      "requires": {
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
     "@types/levelup": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/@types/levelup/-/levelup-4.3.1.tgz",
@@ -751,6 +914,12 @@
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       "dev": true
     },
+    "@types/minimatch": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.4.tgz",
+      "integrity": "sha512-1z8k4wzFnNjVK/tlxvrWuK5WMt6mydWWP7+zvH5eFep4oj+UkrfiJTRtjCeBXNpwaA/FYqqtb4/QS4ianFpIRA==",
+      "dev": true
+    },
     "@types/mkdirp": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/@types/mkdirp/-/mkdirp-0.5.2.tgz",
@@ -805,6 +974,12 @@
         "@types/node": "*"
       }
     },
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
     "abort-controller": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
@@ -831,6 +1006,16 @@
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     },
+    "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"
+      }
+    },
     "acorn": {
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       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
@@ -843,6 +1028,12 @@
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       "dev": true
     },
+    "address": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/address/-/address-1.1.2.tgz",
+      "integrity": "sha512-aT6camzM4xEA54YVJYSqxz1kv4IHnQZRtThJJHhUMRExaU5spC7jX5ugSwTaTgJliIgs4VhZOk7htClvQ/LmRA==",
+      "dev": true
+    },
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       "version": "0.4.16",
       "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.16.tgz",
@@ -875,6 +1066,13 @@
         "uri-js": "^4.2.2"
       }
     },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true,
+      "optional": true
+    },
     "ansi-colors": {
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       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
@@ -950,6 +1148,59 @@
         "typical": "^2.6.1"
       }
     },
+    "array-filter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
+      "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-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
+      "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"
+      }
+    },
+    "asn1.js": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        }
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
     "assertion-error": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
@@ -986,11 +1237,32 @@
         "async": "^2.4.0"
       }
     },
+    "async-limiter": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
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+      "dev": true
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
     "atomic-sleep": {
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     },
+    "available-typed-arrays": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.2.tgz",
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+      "dev": true,
+      "requires": {
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@@ -1002,6 +1274,18 @@
         "queue-microtask": "^1.1.2"
       }
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+    "aws-sign2": {
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+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true
+    },
+    "aws4": {
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+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
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+    },
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+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "requires": {
+        "tweetnacl": "^0.14.3"
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+          "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+          "dev": true
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       "dev": true
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+        "number-to-bn": "1.7.0",
+        "randombytes": "^2.1.0",
+        "underscore": "1.9.1",
+        "utf8": "3.0.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        },
+        "eth-lib": {
+          "version": "0.2.8",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.8.tgz",
+          "integrity": "sha512-ArJ7x1WcWOlSpzdoTBX8vkwlkSQ85CjjifSZtV4co64vWxSV8geWfPI9x4SVYu3DSxnX4yWFVTtGL+j9DUFLNw==",
+          "dev": true,
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        }
       }
     },
-    "uuid": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
-      "dev": true
+    "websocket": {
+      "version": "1.0.34",
+      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.34.tgz",
+      "integrity": "sha512-PRDso2sGwF6kM75QykIesBijKSVceR6jL2G8NGYyq2XrItNC2P5/qL5XeR056GhA+Ly7JMFvJb9I312mJfmqnQ==",
+      "dev": true,
+      "requires": {
+        "bufferutil": "^4.0.1",
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.50",
+        "typedarray-to-buffer": "^3.1.5",
+        "utf-8-validate": "^5.0.2",
+        "yaeti": "^0.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
+        }
+      }
     },
     "which": {
       "version": "1.3.1",
@@ -7496,6 +11415,21 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "which-typed-array": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.4.tgz",
+      "integrity": "sha512-49E0SpUe90cjpoc7BOJwyPHRqSAd12c10Qm2amdEZrJPCY2NDxaW01zHITrem+rnETY3dwrbH3UUrUwagfCYDA==",
+      "dev": true,
+      "requires": {
+        "available-typed-arrays": "^1.0.2",
+        "call-bind": "^1.0.0",
+        "es-abstract": "^1.18.0-next.1",
+        "foreach": "^2.0.5",
+        "function-bind": "^1.1.1",
+        "has-symbols": "^1.0.1",
+        "is-typed-array": "^1.1.3"
+      }
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
@@ -7511,6 +11445,12 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "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": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -7571,6 +11511,57 @@
       "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ==",
       "dev": true
     },
+    "xhr": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.6.0.tgz",
+      "integrity": "sha512-/eCGLb5rxjx5e3mF1A7s+pLlR6CGyqWN91fv1JgER5mVWg1MZmlhBvy9kjcsOdRk8RrIujotWyJamfyrp+WIcA==",
+      "dev": true,
+      "requires": {
+        "global": "~4.4.0",
+        "is-function": "^1.0.1",
+        "parse-headers": "^2.0.0",
+        "xtend": "^4.0.0"
+      }
+    },
+    "xhr-request": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
+      "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
+      "dev": true,
+      "requires": {
+        "buffer-to-arraybuffer": "^0.0.5",
+        "object-assign": "^4.1.1",
+        "query-string": "^5.0.1",
+        "simple-get": "^2.7.0",
+        "timed-out": "^4.0.1",
+        "url-set-query": "^1.0.0",
+        "xhr": "^2.0.4"
+      }
+    },
+    "xhr-request-promise": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.3.tgz",
+      "integrity": "sha512-YUBytBsuwgitWtdRzXDDkWAXzhdGB8bYm0sSzMPZT7Z2MBjMSTHFsyCT1yCRATY+XC69DUrQraRAEgcoCRaIPg==",
+      "dev": true,
+      "requires": {
+        "xhr-request": "^1.1.0"
+      }
+    },
+    "xhr2-cookies": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
+      "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
+      "dev": true,
+      "requires": {
+        "cookiejar": "^2.1.1"
+      }
+    },
+    "xmlhttprequest": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
+      "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw=",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -7583,6 +11574,12 @@
       "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
       "dev": true
     },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=",
+      "dev": true
+    },
     "yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/package.json b/package.json
index 737fdceb..3ad52964 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "scripts": {
     "repl": "ts-node ./scripts/repl.ts",
     "test": "hardhat test",
+    "coverage": "hardhat coverage",
     "solhint": "solhint \"contracts/**/*.sol\" -f unix",
     "lint": "prettier --check \"**/*.{sol,ts,js}\"",
     "prettier": "prettier --write \"**/*.{sol,ts,js}\"",
@@ -47,6 +48,7 @@
     "prettier": "^1.19.1",
     "prettier-plugin-solidity": "1.0.0-beta.10",
     "solhint": "^3.3.3",
+    "solidity-coverage": "v0.8.0-beta.0",
     "ts-node": "^8.8.1",
     "typechain": "^2.0.1",
     "typescript": "^4.2.3"
diff --git a/test/fast/frontends.test.ts b/test/fast/frontends.test.ts
index 18a41075..eec87a05 100644
--- a/test/fast/frontends.test.ts
+++ b/test/fast/frontends.test.ts
@@ -13,6 +13,7 @@ import { Signer } from "ethers";
 import { assert } from "chai";
 
 describe("Frontend", function() {
+    let snapshotId: number;
     let user: User;
     let badSig: mcl.solG1;
     let signer: Signer;
@@ -22,10 +23,12 @@ describe("Frontend", function() {
         [signer] = await ethers.getSigners();
         user = User.new(0, 0, hexToUint8Array(domain));
         badSig = user.signRaw("0xf00d").sol;
+
+        snapshotId = await ethers.provider.send("evm_snapshot", []);
     });
     beforeEach(async function() {
         // Reset to the state before pairing gas estimator is deployed
-        await ethers.provider.send("hardhat_reset", []);
+        await ethers.provider.send("evm_revert", [snapshotId]);
     });
     it("frontendTransfer", async function() {
         const txTransfer = TxTransfer.rand();