diff --git a/.gitignore b/.gitignore
index 18e337d..0a04613 100644
--- a/.gitignore
+++ b/.gitignore
@@ -96,4 +96,6 @@ Thumbs.db
 
 # Ignore built ts files
 __tests__/runner/*
-lib/**/*
\ No newline at end of file
+lib/**/*
+
+.idea
diff --git a/__tests__/checksums.test.ts b/__tests__/checksums.test.ts
new file mode 100644
index 0000000..958be54
--- /dev/null
+++ b/__tests__/checksums.test.ts
@@ -0,0 +1,6 @@
+import * as checksums from '../src/checksums'
+
+test('fetches wrapper jars checksums', async () => {
+    let validChecksums = await checksums.fetchValidChecksums(false)
+    expect(validChecksums.length).toBeGreaterThan(10)
+})
diff --git a/__tests__/data/invalid/gradle-wrapper.jar b/__tests__/data/invalid/gradle-wrapper.jar
new file mode 100644
index 0000000..e69de29
diff --git a/__tests__/data/valid/gradle-wrapper.jar b/__tests__/data/valid/gradle-wrapper.jar
new file mode 100644
index 0000000..6d183c6
Binary files /dev/null and b/__tests__/data/valid/gradle-wrapper.jar differ
diff --git a/__tests__/find.test.ts b/__tests__/find.test.ts
new file mode 100644
index 0000000..287a0d7
--- /dev/null
+++ b/__tests__/find.test.ts
@@ -0,0 +1,10 @@
+import * as path from "path";
+import * as find from '../src/find'
+
+test('finds test data wrapper jars', async () => {
+    let repoRoot = path.resolve('.')
+    let wrapperJars = await find.findWrapperJars(repoRoot)
+    expect(wrapperJars.length).toBe(2)
+    expect(wrapperJars).toContain("__tests__/data/valid/gradle-wrapper.jar")
+    expect(wrapperJars).toContain("__tests__/data/invalid/gradle-wrapper.jar")
+})
diff --git a/__tests__/hash.test.ts b/__tests__/hash.test.ts
new file mode 100644
index 0000000..12981d6
--- /dev/null
+++ b/__tests__/hash.test.ts
@@ -0,0 +1,7 @@
+import * as path from "path";
+import * as hash from '../src/hash'
+
+test('can sha256 files', async () => {
+    let sha = await hash.sha256File(path.resolve('__tests__/data/invalid/gradle-wrapper.jar'))
+    expect(sha).toEqual("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
+})
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
deleted file mode 100644
index efcf95e..0000000
--- a/__tests__/main.test.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import {wait} from '../src/wait'
-import * as process from 'process'
-import * as cp from 'child_process'
-import * as path from 'path'
-
-test('throws invalid number', async () => {
-  const input = parseInt('foo', 10)
-  await expect(wait(input)).rejects.toThrow('milliseconds not a number')
-})
-
-test('wait 500 ms', async () => {
-  const start = new Date()
-  await wait(500)
-  const end = new Date()
-  var delta = Math.abs(end.getTime() - start.getTime())
-  expect(delta).toBeGreaterThan(450)
-})
-
-// shows how the runner will run a javascript action with env / stdout protocol
-test('test runs', () => {
-  process.env['INPUT_MILLISECONDS'] = '500'
-  const ip = path.join(__dirname, '..', 'lib', 'main.js')
-  const options: cp.ExecSyncOptions = {
-    env: process.env
-  }
-  console.log(cp.execSync(`node ${ip}`, options).toString())
-})
diff --git a/__tests__/validate.test.ts b/__tests__/validate.test.ts
new file mode 100644
index 0000000..158cb63
--- /dev/null
+++ b/__tests__/validate.test.ts
@@ -0,0 +1,8 @@
+import * as path from "path";
+import * as validate from '../src/validate'
+
+test('validates wrapper jars', async () => {
+    let invalidWrapperJars = await validate.findInvalidWrapperJars(path.resolve('.'), false)
+    expect(invalidWrapperJars.length).toBe(1)
+    expect(invalidWrapperJars[0]).toEqual("__tests__/data/invalid/gradle-wrapper.jar")
+})
diff --git a/action.yml b/action.yml
index c0575e9..c82dc5b 100644
--- a/action.yml
+++ b/action.yml
@@ -1,10 +1,11 @@
-name: 'Your name here'
-description: 'Provide a description here'
-author: 'Your name or organization here'
+name: 'Gradle Wrapper Check'
+description: 'Check Gradle Wrapper Files'
+author: 'Gradle'
 inputs:
-  myInput:              # change this
-    description: 'input description here'
-    default: 'default value if applicable'
+  allow-snapshots:
+    description: 'Allow snapshot Gradle versions'
+    required: false
+    default: 'false'
 runs:
   using: 'node12'
   main: 'dist/index.js'
diff --git a/jest.config.js b/jest.config.js
index 563d4cc..b80480a 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,6 +1,6 @@
 module.exports = {
   clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
+  moduleFileExtensions: ['js', 'ts', 'json'],
   testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],
   testRunner: 'jest-circus/runner',
@@ -8,4 +8,4 @@ module.exports = {
     '^.+\\.ts$': 'ts-jest'
   },
   verbose: true
-}
\ No newline at end of file
+}
diff --git a/package-lock.json b/package-lock.json
index d942ec4..6acfd81 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -499,10 +499,17 @@
       "dev": true
     },
     "@types/node": {
-      "version": "12.12.14",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.14.tgz",
-      "integrity": "sha512-u/SJDyXwuihpwjXy7hOOghagLEV1KdAST6syfnOk6QZAMzZuWZqXy5aYYZbh8Jdpd4escVFP0MvftHNDb9pruA==",
-      "dev": true
+      "version": "12.12.24",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.24.tgz",
+      "integrity": "sha512-1Ciqv9pqwVtW6FsIUKSZNB82E5Cu1I2bBTj1xuIHXLe/1zYLl3956Nbhg2MzSYHVfl9/rmanjbQIb7LibfCnug=="
+    },
+    "@types/nodegit": {
+      "version": "0.26.0",
+      "resolved": "https://registry.npmjs.org/@types/nodegit/-/nodegit-0.26.0.tgz",
+      "integrity": "sha512-Wg0+KW6QwoZTpM+bzxuTuW4uxYur7aFa+OPksg8ggTgDHnjC3Q7tmuLW6Pz0e4pgNZiB/vxIBO3lQq/k0aaIHg==",
+      "requires": {
+        "@types/node": "*"
+      }
     },
     "@types/stack-utils": {
       "version": "1.0.1",
@@ -627,6 +634,11 @@
       "integrity": "sha512-tsFzPpcttalNjFBCFMqsKYQcWxxen1pgJR56by//QwvJc4/OUS3kPOOttx2tSIfjsylB0pYu7f5D3K1RCxUnUg==",
       "dev": true
     },
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
+    },
     "acorn": {
       "version": "6.4.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.0.tgz",
@@ -659,7 +671,6 @@
       "version": "6.10.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
       "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
-      "dev": true,
       "requires": {
         "fast-deep-equal": "^2.0.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -698,6 +709,20 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw=="
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -757,11 +782,15 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
+    "asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
+    },
     "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"
       }
@@ -769,8 +798,7 @@
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-      "dev": true
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "assign-symbols": {
       "version": "1.0.0",
@@ -799,8 +827,7 @@
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
-      "dev": true
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
     },
     "atob": {
       "version": "2.1.2",
@@ -811,14 +838,12 @@
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
     },
     "aws4": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.0.tgz",
-      "integrity": "sha512-Uvq6hVe90D0B2WEnUqtdgY1bATGz3mw33nH9Y+dmA+w5DHvUmBgkr5rM/KCHpCsiFNRUfokW/szpPPgMK2hm4A==",
-      "dev": true
+      "integrity": "sha512-Uvq6hVe90D0B2WEnUqtdgY1bATGz3mw33nH9Y+dmA+w5DHvUmBgkr5rM/KCHpCsiFNRUfokW/szpPPgMK2hm4A=="
     },
     "axobject-query": {
       "version": "2.1.1",
@@ -938,8 +963,7 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base": {
       "version": "0.11.2",
@@ -1000,16 +1024,23 @@
       "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"
       }
     },
+    "bl": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      }
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -1085,6 +1116,25 @@
         "node-int64": "^0.4.0"
       }
     },
+    "buffer-alloc": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
+      "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
+      "requires": {
+        "buffer-alloc-unsafe": "^1.1.0",
+        "buffer-fill": "^1.0.0"
+      }
+    },
+    "buffer-alloc-unsafe": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
+      "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg=="
+    },
+    "buffer-fill": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
+      "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -1132,8 +1182,7 @@
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-      "dev": true
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
     },
     "chalk": {
       "version": "2.4.2",
@@ -1152,6 +1201,11 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "chownr": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.3.tgz",
+      "integrity": "sha512-i70fVHhmV3DtTl6nqvZOnIjbY0Pe4kAUjwHj8z0zAdgBtYrJyYwLKCCuRBQ5ppkyL0AkN7HKRnETdmdp1zqNXw=="
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -1235,6 +1289,11 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -1264,7 +1323,6 @@
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
       "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
-      "dev": true,
       "requires": {
         "delayed-stream": "~1.0.0"
       }
@@ -1284,8 +1342,12 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+    },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
     },
     "contains-path": {
       "version": "0.1.0",
@@ -1317,8 +1379,7 @@
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
     "cross-fetch": {
       "version": "2.2.2",
@@ -1376,7 +1437,6 @@
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
       "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0"
       }
@@ -1426,6 +1486,11 @@
       "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
       "dev": true
     },
+    "deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA=="
+    },
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
@@ -1485,8 +1550,17 @@
     "delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
+    },
+    "delegates": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
+    },
+    "detect-libc": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
+      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups="
     },
     "detect-newline": {
       "version": "2.1.0",
@@ -1522,7 +1596,6 @@
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
       "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
-      "dev": true,
       "requires": {
         "jsbn": "~0.1.0",
         "safer-buffer": "^2.1.0"
@@ -1538,7 +1611,6 @@
       "version": "1.4.4",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
       "integrity": "sha512-+uw1inIHVPQoaVuHzRyXd21icM+cnt4CzD5rW+NC1wjOUSTOs+Te7FOv7AhN7vS9x/oIyhLP5PR1H+phQAHu5Q==",
-      "dev": true,
       "requires": {
         "once": "^1.4.0"
       }
@@ -2200,8 +2272,7 @@
     "extend": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
-      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
-      "dev": true
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g=="
     },
     "extend-shallow": {
       "version": "3.0.2",
@@ -2303,14 +2374,12 @@
     "extsprintf": {
       "version": "1.3.0",
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-      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
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       "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
-      "dev": true,
       "requires": {
         "glob": "^7.1.3"
       }
@@ -5409,8 +5756,7 @@
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-      "dev": true
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
     },
     "safe-regex": {
       "version": "1.1.0",
@@ -5424,8 +5770,7 @@
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
     "sane": {
       "version": "4.1.0",
@@ -5455,8 +5800,7 @@
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
-      "dev": true
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
     },
     "semver": {
       "version": "6.3.0",
@@ -5467,8 +5811,7 @@
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
     },
     "set-value": {
       "version": "2.0.1",
@@ -5517,8 +5860,7 @@
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
-      "dev": true
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
     },
     "sisteransi": {
       "version": "1.0.4",
@@ -5759,7 +6101,6 @@
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
       "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
-      "dev": true,
       "requires": {
         "asn1": "~0.2.3",
         "assert-plus": "^1.0.0",
@@ -5802,8 +6143,7 @@
     "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
+      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks="
     },
     "string-length": {
       "version": "2.0.0",
@@ -5819,7 +6159,6 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
       "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
-      "dev": true,
       "requires": {
         "is-fullwidth-code-point": "^2.0.0",
         "strip-ansi": "^4.0.0"
@@ -5845,11 +6184,18 @@
         "function-bind": "^1.1.1"
       }
     },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "strip-ansi": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
       "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-      "dev": true,
       "requires": {
         "ansi-regex": "^3.0.0"
       },
@@ -5857,8 +6203,7 @@
         "ansi-regex": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
         }
       }
     },
@@ -5877,8 +6222,7 @@
     "strip-json-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
-      "dev": true
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
     },
     "supports-color": {
       "version": "5.5.0",
@@ -5935,6 +6279,56 @@
         }
       }
     },
+    "tar": {
+      "version": "4.4.13",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
+      "integrity": "sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==",
+      "requires": {
+        "chownr": "^1.1.1",
+        "fs-minipass": "^1.2.5",
+        "minipass": "^2.8.6",
+        "minizlib": "^1.2.1",
+        "mkdirp": "^0.5.0",
+        "safe-buffer": "^5.1.2",
+        "yallist": "^3.0.3"
+      }
+    },
+    "tar-fs": {
+      "version": "1.16.3",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-1.16.3.tgz",
+      "integrity": "sha512-NvCeXpYx7OsmOh8zIOP/ebG55zZmxLE0etfWRbWok+q2Qo8x/vOR/IJT1taADXPe+jsiu9axDb3X4B+iIgNlKw==",
+      "requires": {
+        "chownr": "^1.0.1",
+        "mkdirp": "^0.5.1",
+        "pump": "^1.0.0",
+        "tar-stream": "^1.1.2"
+      },
+      "dependencies": {
+        "pump": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/pump/-/pump-1.0.3.tgz",
+          "integrity": "sha512-8k0JupWme55+9tCVE+FS5ULT3K6AbgqrGa58lTT49RpyfwwcGedHqaC5LlQNdEAumn/wFsu6aPwkuPMioy8kqw==",
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
+        }
+      }
+    },
+    "tar-stream": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
+      "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
+      "requires": {
+        "bl": "^1.0.0",
+        "buffer-alloc": "^1.2.0",
+        "end-of-stream": "^1.0.0",
+        "fs-constants": "^1.0.0",
+        "readable-stream": "^2.3.0",
+        "to-buffer": "^1.1.1",
+        "xtend": "^4.0.0"
+      }
+    },
     "test-exclude": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
@@ -5980,6 +6374,11 @@
       "integrity": "sha1-I2QN17QtAEM5ERQIIOXPRA5SHdE=",
       "dev": true
     },
+    "to-buffer": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
+      "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg=="
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -6032,7 +6431,6 @@
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
       "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
-      "dev": true,
       "requires": {
         "psl": "^1.1.28",
         "punycode": "^2.1.1"
@@ -6103,11 +6501,15 @@
         "tslib": "^1.8.1"
       }
     },
+    "tunnel": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.4.tgz",
+      "integrity": "sha1-LTeFoVjBdMmhbcLARuxfxfF0IhM="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
       }
@@ -6115,8 +6517,7 @@
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
     },
     "type-check": {
       "version": "0.3.2",
@@ -6127,6 +6528,23 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "typed-rest-client": {
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/typed-rest-client/-/typed-rest-client-1.7.1.tgz",
+      "integrity": "sha512-fZRDWFtUp3J2E0jOiCJYZ9LDrYZHpjY95su//ekqXERS7C1qojP6movh7M4JGURJnBuTVsO0g2N4vEoW5o3Djw==",
+      "requires": {
+        "qs": "^6.9.1",
+        "tunnel": "0.0.4",
+        "underscore": "1.8.3"
+      },
+      "dependencies": {
+        "qs": {
+          "version": "6.9.1",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.1.tgz",
+          "integrity": "sha512-Cxm7/SS/y/Z3MHWSxXb8lIFqgqBowP5JMlTUFyJN88y0SGQhVmZnqFK/PeuMX9LzUyWsqqhNxIyg0jlzq946yA=="
+        }
+      }
+    },
     "typescript": {
       "version": "3.7.2",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.2.tgz",
@@ -6153,6 +6571,11 @@
         }
       }
     },
+    "underscore": {
+      "version": "1.8.3",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
+      "integrity": "sha1-Tz+1OxBuYJf8+ctBCfKl6b36UCI="
+    },
     "union-value": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
@@ -6165,6 +6588,11 @@
         "set-value": "^2.0.1"
       }
     },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+    },
     "unset-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
@@ -6209,7 +6637,6 @@
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
       "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
-      "dev": true,
       "requires": {
         "punycode": "^2.1.0"
       }
@@ -6226,6 +6653,11 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
     "util.promisify": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
@@ -6239,8 +6671,7 @@
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
-      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
-      "dev": true
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
     },
     "validate-npm-package-license": {
       "version": "3.0.4",
@@ -6256,7 +6687,6 @@
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
@@ -6323,7 +6753,6 @@
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
-      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -6334,6 +6763,14 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
@@ -6382,8 +6819,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "1.0.3",
@@ -6420,12 +6856,22 @@
       "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
       "dev": true
     },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
+    },
     "yargs": {
       "version": "13.3.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
diff --git a/package.json b/package.json
index 44a03cd..1db701e 100644
--- a/package.json
+++ b/package.json
@@ -25,11 +25,14 @@
   "author": "YourNameOrOrganization",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.2.0"
+    "@actions/core": "^1.2.0",
+    "@types/nodegit": "^0.26.0",
+    "nodegit": "^0.26.3",
+    "typed-rest-client": "^1.7.1"
   },
   "devDependencies": {
     "@types/jest": "^24.0.23",
-    "@types/node": "^12.7.12",
+    "@types/node": "^12.12.24",
     "@typescript-eslint/parser": "^2.8.0",
     "@zeit/ncc": "^0.20.5",
     "eslint": "^5.16.0",
diff --git a/src/checksums.ts b/src/checksums.ts
new file mode 100644
index 0000000..c0c92a9
--- /dev/null
+++ b/src/checksums.ts
@@ -0,0 +1,21 @@
+import * as httpm from 'typed-rest-client/HttpClient'
+
+const httpc = new httpm.HttpClient("eskatos/gradle-wrapper-check");
+
+export async function fetchValidChecksums(allowSnapshots: boolean): Promise<string[]> {
+    let all: any[] = await httpGetJson('https://services.gradle.org/versions/all')
+    let withChecksum = all.filter(entry => entry.hasOwnProperty('wrapperChecksumUrl'))
+    let allowed = withChecksum.filter(entry => allowSnapshots || !entry.snapshot)
+    let checksumUrls: string[] = allowed.map(entry => entry.wrapperChecksumUrl)
+    let checksums = await Promise.all(checksumUrls.map((url: string) => httpGetText(url)))
+    return [...new Set(checksums)]
+}
+
+async function httpGetJson(url: string): Promise<any> {
+    return JSON.parse(await httpGetText(url));
+}
+
+async function httpGetText(url: string): Promise<string> {
+    const response = await httpc.get(url);
+    return await response.readBody();
+}
diff --git a/src/find.ts b/src/find.ts
new file mode 100644
index 0000000..eae1f18
--- /dev/null
+++ b/src/find.ts
@@ -0,0 +1,31 @@
+import {Repository, Commit, Tree, TreeEntry} from 'nodegit'
+
+
+export async function findWrapperJars(gitRepoPath: string): Promise<string[]> {
+
+    let repo: Repository = await Repository.open(gitRepoPath)
+    let commit: Commit = await repo.getMasterCommit()
+    let tree: Tree = await commit.getTree()
+    let walker = tree.walk()
+
+    let prom: Promise<string[]> = new Promise(((resolve, reject) => {
+
+        let wrapperJars: string[] = []
+
+        walker.on("entry", (entry: TreeEntry) => {
+            let path = entry.path()
+            if (path.endsWith('gradle-wrapper.jar')) {
+                wrapperJars.push(path)
+            }
+        })
+        walker.on("error", (error) => {
+            reject(error)
+        })
+        walker.on("end", (trees) => {
+            resolve(wrapperJars)
+        })
+
+    }))
+    walker.start()
+    return prom
+}
diff --git a/src/hash.ts b/src/hash.ts
new file mode 100644
index 0000000..68b9649
--- /dev/null
+++ b/src/hash.ts
@@ -0,0 +1,12 @@
+import * as crypto from "crypto"
+import * as fs from "fs"
+
+export async function sha256File(path: string): Promise<string> {
+    return new Promise((resolve, reject) => {
+        const hash = crypto.createHash("sha256")
+        fs.createReadStream(path)
+            .on("data", data => hash.update(data))
+            .on("end", () => resolve(hash.digest("hex")))
+            .on("error", error => reject(error))
+    })
+}
diff --git a/src/main.ts b/src/main.ts
index b167fb5..01a7e51 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,19 +1,19 @@
+import * as path from "path";
 import * as core from '@actions/core'
-import {wait} from './wait'
 
-async function run(): Promise<void> {
-  try {
-    const ms: string = core.getInput('milliseconds')
-    core.debug(`Waiting ${ms} milliseconds ...`)
+import * as validate from "./validate"
 
-    core.debug(new Date().toTimeString())
-    await wait(parseInt(ms, 10))
-    core.debug(new Date().toTimeString())
 
-    core.setOutput('time', new Date().toTimeString())
-  } catch (error) {
-    core.setFailed(error.message)
-  }
+export async function run(): Promise<void> {
+    try {
+        const allowSnapshots = core.getInput("allow-snapshots") == "true"
+        const invalidWrapperJars = await validate.findInvalidWrapperJars(path.resolve('.'), allowSnapshots)
+        if (invalidWrapperJars.length > 0) {
+            core.setFailed("Invalid wrapper jars " + invalidWrapperJars)
+        }
+    } catch (error) {
+        core.setFailed(error.message)
+    }
 }
 
 run()
diff --git a/src/validate.ts b/src/validate.ts
new file mode 100644
index 0000000..e882ea0
--- /dev/null
+++ b/src/validate.ts
@@ -0,0 +1,21 @@
+import * as find from "./find"
+import * as checksums from "./checksums"
+import * as hash from "./hash"
+
+
+export async function findInvalidWrapperJars(gitRepoRoot: string, allowSnapshots: boolean): Promise<string[]> {
+
+    const wrapperJars = await find.findWrapperJars(gitRepoRoot)
+    if (wrapperJars.length > 0) {
+        const validChecksums = await checksums.fetchValidChecksums(allowSnapshots)
+        const invalidWrapperJars: string[] = []
+        for (let wrapperJar of wrapperJars) {
+            const sha = await hash.sha256File(wrapperJar)
+            if (validChecksums.indexOf(sha) < 0) {
+                invalidWrapperJars.push(wrapperJar)
+            }
+        }
+        return invalidWrapperJars
+    }
+    return []
+}
diff --git a/src/wait.ts b/src/wait.ts
deleted file mode 100644
index b169d9a..0000000
--- a/src/wait.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-export async function wait(milliseconds: number): Promise<string> {
-  return new Promise(resolve => {
-    if (isNaN(milliseconds)) {
-      throw new Error('milliseconds not a number')
-    }
-
-    setTimeout(() => resolve('done!'), milliseconds)
-  })
-}