diff --git a/package.json b/package.json
index 40e8b1b0f..1c0ec76e0 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,7 @@
     "html-webpack-plugin": "^2.30.1",
     "husky": "^3.0.8",
     "jest": "^24.5.0",
+    "jest-circus": "^24.6.0",
     "lint-staged": "^7.1.0",
     "minimist": "^1.2.0",
     "prettier": "^1.12.1",
diff --git a/packages/dai/jest.config.js b/packages/dai/jest.config.js
index a3611ffdf..21f7a060b 100644
--- a/packages/dai/jest.config.js
+++ b/packages/dai/jest.config.js
@@ -14,5 +14,6 @@ module.exports = {
     "test"
   ],
   "setupFilesAfterEnv": ["<rootDir>/test/setup-test.js"],
+  "testRunner": "jest-circus/runner",
   "testPathIgnorePatterns": ["<rootDir>/node_modules/", "<rootDir>/test/build.spec.js", "<rootDir>/test/integration/"]
 }
diff --git a/packages/dai/test/eth/EthereumCdpService.spec.js b/packages/dai/test/eth/EthereumCdpService.spec.js
index 496c6b09b..f06394064 100644
--- a/packages/dai/test/eth/EthereumCdpService.spec.js
+++ b/packages/dai/test/eth/EthereumCdpService.spec.js
@@ -101,21 +101,19 @@ describe('find cdp', () => {
 test('can calculate system collateralization', async () => {
   const cdp = await cdpService.openCdp();
   let lock = cdp.lockEth(0.1);
-  mineBlocks(cdpService);
-  await lock;
+  await Promise.all([lock, mineBlocks(cdpService)]);
   await cdp.drawDai(1);
   const scA = await cdpService.getSystemCollateralization();
 
   lock = cdp.lockEth(0.1);
-  mineBlocks(cdpService);
-  await lock;
+  await Promise.all([lock, mineBlocks(cdpService)]);
   const scB = await cdpService.getSystemCollateralization();
   expect(scB).toBeGreaterThan(scA);
 
   await cdp.drawDai(1);
   const scC = await cdpService.getSystemCollateralization();
   expect(scC).toBeLessThan(scB);
-});
+}, 10000);
 
 test('openCdp returns the transaction object', async () => {
   const txo = cdpService.openCdp();
diff --git a/packages/dai/test/eth/Web3Service.spec.js b/packages/dai/test/eth/Web3Service.spec.js
index ba7bad29d..8434de505 100644
--- a/packages/dai/test/eth/Web3Service.spec.js
+++ b/packages/dai/test/eth/Web3Service.spec.js
@@ -141,7 +141,7 @@ test('be authenticated and know default address when private key passed in', don
 });
 
 test('determine correct connection status', async done => {
-  const service = buildTestService();
+  const service = buildTestService(null, 200);
 
   expect(await service._isStillConnected()).toBe(false);
   await service.manager().connect();
diff --git a/yarn.lock b/yarn.lock
index 5a1897f0b..3a1aa78a9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -861,6 +861,15 @@
     unique-filename "^1.1.1"
     which "^1.3.1"
 
+"@jest/console@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/console/-/console-24.6.0.tgz#63225e6889f3865ab5b7a0d8797e8aed417c4e0b"
+  integrity sha512-nNZbwtZwW6dr7bvZpRBCdBNvZYi+jr6lfnubSOCELk/Km/5csDmGdqeS4qKwGKIVlHTyZ95MYExYevpdh26tDA==
+  dependencies:
+    "@jest/source-map" "^24.3.0"
+    chalk "^2.0.1"
+    slash "^2.0.0"
+
 "@jest/console@^24.7.1":
   version "24.7.1"
   resolved "https://registry.yarnpkg.com/@jest/console/-/console-24.7.1.tgz#32a9e42535a97aedfe037e725bd67e954b459545"
@@ -903,6 +912,16 @@
     rimraf "^2.5.4"
     strip-ansi "^5.0.0"
 
+"@jest/environment@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/environment/-/environment-24.6.0.tgz#6dea095baee2ce23ed05328468f945291f30ed30"
+  integrity sha512-LccuUfnREDNFbKmMWrtzUJu6fwU1E6ddYlYSDuClEQvboMKQQMUuCSYXvRUQFtDdeVjUfxkHqfSVvBzuph0b7w==
+  dependencies:
+    "@jest/fake-timers" "^24.6.0"
+    "@jest/transform" "^24.6.0"
+    "@jest/types" "^24.6.0"
+    jest-mock "^24.6.0"
+
 "@jest/environment@^24.8.0":
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/@jest/environment/-/environment-24.8.0.tgz#0342261383c776bdd652168f68065ef144af0eac"
@@ -913,6 +932,15 @@
     "@jest/types" "^24.8.0"
     jest-mock "^24.8.0"
 
+"@jest/fake-timers@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/fake-timers/-/fake-timers-24.6.0.tgz#4eb0b47539883742e9f969e983770230f5a57d7b"
+  integrity sha512-92nYqkZceki6knls7F6/FrPxKXnQl0QjYXbjLk/EFfp6xcg4ETLQSAur7pMZsiAzazAgQag/XDvMmKwMbunAeg==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    jest-message-util "^24.6.0"
+    jest-mock "^24.6.0"
+
 "@jest/fake-timers@^24.8.0":
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/@jest/fake-timers/-/fake-timers-24.8.0.tgz#2e5b80a4f78f284bcb4bd5714b8e10dd36a8d3d1"
@@ -958,6 +986,15 @@
     graceful-fs "^4.1.15"
     source-map "^0.6.0"
 
+"@jest/test-result@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/test-result/-/test-result-24.6.0.tgz#fd56c12b031601c282eede8a5ec1317ebe63bd11"
+  integrity sha512-k6pdgBBJIDbBgQGZgt8IbQC/KrOAC+fsSZrHw62R54FnfoYzuDqnrbB/AfPJS8T4RjDsWvnAHgXLH866yG10Pg==
+  dependencies:
+    "@jest/console" "^24.6.0"
+    "@jest/types" "^24.6.0"
+    "@types/istanbul-lib-coverage" "^2.0.0"
+
 "@jest/test-result@^24.8.0":
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/@jest/test-result/-/test-result-24.8.0.tgz#7675d0aaf9d2484caa65e048d9b467d160f8e9d3"
@@ -977,6 +1014,27 @@
     jest-runner "^24.8.0"
     jest-runtime "^24.8.0"
 
+"@jest/transform@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/transform/-/transform-24.6.0.tgz#dc7a00591651b89c2582602fe5c4ce47a5398148"
+  integrity sha512-aC7Yff2XREV1C/RQCoP1WzO3NU4EtmImIJXnNm4tTgaLoGGv1HJuXziyd5v7zOjBzn96793rF0iLHlFT4w4ErA==
+  dependencies:
+    "@babel/core" "^7.1.0"
+    "@jest/types" "^24.6.0"
+    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 "^24.6.0"
+    jest-regex-util "^24.3.0"
+    jest-util "^24.6.0"
+    micromatch "^3.1.10"
+    realpath-native "^1.1.0"
+    slash "^2.0.0"
+    source-map "^0.6.1"
+    write-file-atomic "2.4.1"
+
 "@jest/transform@^24.8.0":
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/@jest/transform/-/transform-24.8.0.tgz#628fb99dce4f9d254c6fd9341e3eea262e06fef5"
@@ -998,6 +1056,14 @@
     source-map "^0.6.1"
     write-file-atomic "2.4.1"
 
+"@jest/types@^24.6.0":
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-24.6.0.tgz#cf018e56f3ef45e81119fd613fc20a9819f4eddd"
+  integrity sha512-hnCMhUokUm6A4HPE9j3pNG9N+bSFfhqje3EbIrW6YjUW2SXuyZxy1QsJdaICo1oN1o2vVSx6qlVqQYkmWVsjiA==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/yargs" "^12.0.9"
+
 "@jest/types@^24.8.0":
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/@jest/types/-/types-24.8.0.tgz#f31e25948c58f0abd8c845ae26fcea1491dea7ad"
@@ -5164,6 +5230,18 @@ expand-brackets@^2.1.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
+expect@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/expect/-/expect-24.6.0.tgz#0db9c0acd939d939426f7eef272dc69682b71bb0"
+  integrity sha512-kxe6ALQboiWfbAvY+ApKyQ42ZGksLPfUhF0Nf0k04aBcLjVxwwn47Uz9Kbv4pELUuzJaU7tvWbvzRpNrIXfcQw==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    ansi-styles "^3.2.0"
+    jest-get-type "^24.3.0"
+    jest-matcher-utils "^24.6.0"
+    jest-message-util "^24.6.0"
+    jest-regex-util "^24.3.0"
+
 expect@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/expect/-/expect-24.8.0.tgz#471f8ec256b7b6129ca2524b2a62f030df38718d"
@@ -6773,6 +6851,28 @@ jest-changed-files@^24.8.0:
     execa "^1.0.0"
     throat "^4.0.0"
 
+jest-circus@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-circus/-/jest-circus-24.6.0.tgz#a311855f76ce446d5c3ecadca007f42d6aab67ac"
+  integrity sha512-2mv3yB01BZWTpJiamo18DAI0ZrYIpmJBf/6OWx0KKEnam8VwEh+/jPnXORHwQUHkDZKro+Cv9NIHjU1YObfWZQ==
+  dependencies:
+    "@babel/traverse" "^7.1.0"
+    "@jest/environment" "^24.6.0"
+    "@jest/test-result" "^24.6.0"
+    "@jest/types" "^24.6.0"
+    chalk "^2.0.1"
+    co "^4.6.0"
+    expect "^24.6.0"
+    is-generator-fn "^2.0.0"
+    jest-each "^24.6.0"
+    jest-matcher-utils "^24.6.0"
+    jest-message-util "^24.6.0"
+    jest-snapshot "^24.6.0"
+    jest-util "^24.6.0"
+    pretty-format "^24.6.0"
+    stack-utils "^1.0.1"
+    throat "^4.0.0"
+
 jest-cli@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-cli/-/jest-cli-24.8.0.tgz#b075ac914492ed114fa338ade7362a301693e989"
@@ -6815,6 +6915,16 @@ jest-config@^24.8.0:
     pretty-format "^24.8.0"
     realpath-native "^1.1.0"
 
+jest-diff@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-24.6.0.tgz#35858787c07f94ce51df9f865f375c3b4046c25a"
+  integrity sha512-r+W4NHYot9ywuiO8JJ3WeDxV+8Bu9vNg7YLWmjLx9RQOC7UtiPcODgvLJIckJ2QIwJ4B/EfjiaLGN24Kew/Y2w==
+  dependencies:
+    chalk "^2.0.1"
+    diff-sequences "^24.3.0"
+    jest-get-type "^24.3.0"
+    pretty-format "^24.6.0"
+
 jest-diff@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-24.8.0.tgz#146435e7d1e3ffdf293d53ff97e193f1d1546172"
@@ -6832,6 +6942,17 @@ jest-docblock@^24.3.0:
   dependencies:
     detect-newline "^2.1.0"
 
+jest-each@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-each/-/jest-each-24.6.0.tgz#945699a577fd2362b620ddf31ad1f7699badb2da"
+  integrity sha512-+LiF4T/sgpAE4j2p449rwHEJUGPcT+aBOo9mbMSqafnOWGY7R4D1O3DZBGtW7ObumSHj7ZuQkigu9vNQqw5oPQ==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    chalk "^2.0.1"
+    jest-get-type "^24.3.0"
+    jest-util "^24.6.0"
+    pretty-format "^24.6.0"
+
 jest-each@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-each/-/jest-each-24.8.0.tgz#a05fd2bf94ddc0b1da66c6d13ec2457f35e52775"
@@ -6871,11 +6992,31 @@ jest-get-type@^22.1.0:
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-22.4.3.tgz#e3a8504d8479342dd4420236b322869f18900ce4"
   integrity sha512-/jsz0Y+V29w1chdXVygEKSz2nBoHoYqNShPe+QgxSNjAuP1i8+k4LbQNrfoliKej0P45sivkSCh7yiD6ubHS3w==
 
+jest-get-type@^24.3.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-24.9.0.tgz#1684a0c8a50f2e4901b6644ae861f579eed2ef0e"
+  integrity sha512-lUseMzAley4LhIcpSP9Jf+fTrQ4a1yHQwLNeeVa2cEmbCGeoZAtYPOIv8JaxLD/sUpKxetKGP+gsHl8f8TSj8Q==
+
 jest-get-type@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-24.8.0.tgz#a7440de30b651f5a70ea3ed7ff073a32dfe646fc"
   integrity sha512-RR4fo8jEmMD9zSz2nLbs2j0zvPpk/KCEz3a62jJWbd2ayNo0cb+KFRxPHVhE4ZmgGJEQp0fosmNz84IfqM8cMQ==
 
+jest-haste-map@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-24.6.0.tgz#c6aa40999129fd5cdb52af4ac6c1e8ab653c00d3"
+  integrity sha512-P0Lhy/vZ/4S7DzVS3KeWMT1FFQ9Qo3QdiqywPoG3FE74iNk44nGzwin3pYnR8dzrfd+SBmutdXLaIfywuU1XxQ==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    fb-watchman "^2.0.0"
+    graceful-fs "^4.1.15"
+    invariant "^2.2.4"
+    jest-serializer "^24.4.0"
+    jest-util "^24.6.0"
+    jest-worker "^24.6.0"
+    micromatch "^3.1.10"
+    sane "^4.0.3"
+
 jest-haste-map@^24.8.0:
   version "24.8.1"
   resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-24.8.1.tgz#f39cc1d2b1d907e014165b4bd5a957afcb992982"
@@ -6924,6 +7065,16 @@ jest-leak-detector@^24.8.0:
   dependencies:
     pretty-format "^24.8.0"
 
+jest-matcher-utils@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-24.6.0.tgz#8562d38a760238656806df2f77daeca9a0c5851a"
+  integrity sha512-bXC5aDKXd1t7FfRiEahVoDWuvZI7NMWPd5u8Mn6aPMmQ0k+wG8RmASKjfuCGUOQJ4egV2hTx3wBQ8aipz3qFoA==
+  dependencies:
+    chalk "^2.0.1"
+    jest-diff "^24.6.0"
+    jest-get-type "^24.3.0"
+    pretty-format "^24.6.0"
+
 jest-matcher-utils@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-24.8.0.tgz#2bce42204c9af12bde46f83dc839efe8be832495"
@@ -6934,6 +7085,20 @@ jest-matcher-utils@^24.8.0:
     jest-get-type "^24.8.0"
     pretty-format "^24.8.0"
 
+jest-message-util@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-message-util/-/jest-message-util-24.6.0.tgz#585b8dd65c34a9d0e6f68b3feeb46918ee40b976"
+  integrity sha512-5VEaI9jAm78YlMqNa92670QU/+d4F5TK0eiKEVQ3KwYbVL1kp8RmHg/2oqiKC3LMulyzlIiaqZTnJPk3hcqxwQ==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    "@jest/test-result" "^24.6.0"
+    "@jest/types" "^24.6.0"
+    "@types/stack-utils" "^1.0.1"
+    chalk "^2.0.1"
+    micromatch "^3.1.10"
+    slash "^2.0.0"
+    stack-utils "^1.0.1"
+
 jest-message-util@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-message-util/-/jest-message-util-24.8.0.tgz#0d6891e72a4beacc0292b638685df42e28d6218b"
@@ -6948,6 +7113,13 @@ jest-message-util@^24.8.0:
     slash "^2.0.0"
     stack-utils "^1.0.1"
 
+jest-mock@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-mock/-/jest-mock-24.6.0.tgz#fd21d9f0c4b77d6b1cbd320223a56c5ae294b86b"
+  integrity sha512-GoJKwJrQUlI0yYLUO6fhR+s+aBqgCBERCdA8nDbMuqntkuydwLtMcYJI05eEWXL4zsH5Hw4Z5wfiMLjZsZZ3QA==
+  dependencies:
+    "@jest/types" "^24.6.0"
+
 jest-mock@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-mock/-/jest-mock-24.8.0.tgz#2f9d14d37699e863f1febf4e4d5a33b7fdbbde56"
@@ -6974,6 +7146,17 @@ jest-resolve-dependencies@^24.8.0:
     jest-regex-util "^24.3.0"
     jest-snapshot "^24.8.0"
 
+jest-resolve@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-resolve/-/jest-resolve-24.6.0.tgz#7ab8e6b274d5dac6df5c4911f0cd0af0124b44f7"
+  integrity sha512-d72QLxKtVb4M+3GRyxSWMQ2umgTktleqrgarSwpRkRECYE7xg55655cgPEj2cfhBjFkj6Pq4mAU2P3GRploMmQ==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    browser-resolve "^1.11.3"
+    chalk "^2.0.1"
+    jest-pnp-resolver "^1.2.1"
+    realpath-native "^1.1.0"
+
 jest-resolve@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-resolve/-/jest-resolve-24.8.0.tgz#84b8e5408c1f6a11539793e2b5feb1b6e722439f"
@@ -7044,6 +7227,24 @@ jest-serializer@^24.4.0:
   resolved "https://registry.yarnpkg.com/jest-serializer/-/jest-serializer-24.4.0.tgz#f70c5918c8ea9235ccb1276d232e459080588db3"
   integrity sha512-k//0DtglVstc1fv+GY/VHDIjrtNjdYvYjMlbLUed4kxrE92sIUewOi5Hj3vrpB8CXfkJntRPDRjCrCvUhBdL8Q==
 
+jest-snapshot@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-snapshot/-/jest-snapshot-24.6.0.tgz#ec68e0982c1e38cbaefd2cff2c9ac99fdfe5c206"
+  integrity sha512-G+1q27n6lOdzqpcmP5GnpCfwz4t0E/wasoyNdqvjb6gbLCdfo6Y5ZcPxiclYNOBtGATbbb3IVXeR+ey3aWjSFg==
+  dependencies:
+    "@babel/types" "^7.0.0"
+    "@jest/types" "^24.6.0"
+    chalk "^2.0.1"
+    expect "^24.6.0"
+    jest-diff "^24.6.0"
+    jest-matcher-utils "^24.6.0"
+    jest-message-util "^24.6.0"
+    jest-resolve "^24.6.0"
+    mkdirp "^0.5.1"
+    natural-compare "^1.4.0"
+    pretty-format "^24.6.0"
+    semver "^5.5.0"
+
 jest-snapshot@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-snapshot/-/jest-snapshot-24.8.0.tgz#3bec6a59da2ff7bc7d097a853fb67f9d415cb7c6"
@@ -7062,6 +7263,24 @@ jest-snapshot@^24.8.0:
     pretty-format "^24.8.0"
     semver "^5.5.0"
 
+jest-util@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-24.6.0.tgz#725a380e8f21fcdf53bd5bd5829ee78903ffc756"
+  integrity sha512-f7JbP/tfJuc955+PMvCI49Mn8wCPe+5CV4vSfc2Pi06jrSDGlsTj6mmc5+UF8ApzIQ7ficTUv4JXXcjplbm9TA==
+  dependencies:
+    "@jest/console" "^24.6.0"
+    "@jest/fake-timers" "^24.6.0"
+    "@jest/source-map" "^24.3.0"
+    "@jest/test-result" "^24.6.0"
+    "@jest/types" "^24.6.0"
+    callsites "^3.0.0"
+    chalk "^2.0.1"
+    graceful-fs "^4.1.15"
+    is-ci "^2.0.0"
+    mkdirp "^0.5.1"
+    slash "^2.0.0"
+    source-map "^0.6.0"
+
 jest-util@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-24.8.0.tgz#41f0e945da11df44cc76d64ffb915d0716f46cd1"
@@ -9297,6 +9516,16 @@ pretty-format@^23.6.0:
     ansi-regex "^3.0.0"
     ansi-styles "^3.2.0"
 
+pretty-format@^24.6.0:
+  version "24.6.0"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-24.6.0.tgz#66124fe5ea5c4d473337a204ece220e8fdc9806c"
+  integrity sha512-xEeJZFqXgvzSEMxoZ3j4aTaax/pl1upVsfMstcIC048Id84Ve5aqX0WkAta/wFIBLDRz6Tbuj6HcoBXRNk7rtA==
+  dependencies:
+    "@jest/types" "^24.6.0"
+    ansi-regex "^4.0.0"
+    ansi-styles "^3.2.0"
+    react-is "^16.8.4"
+
 pretty-format@^24.8.0:
   version "24.8.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-24.8.0.tgz#8dae7044f58db7cb8be245383b565a963e3c27f2"