diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..2583109
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,35 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+name: ci
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [12, 14]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+      - run: node --version
+      # The first installation step ensures that all of our production
+      # dependencies work on the given Node.js version, this helps us find
+      # dependencies that don't match our engines field:
+      - run: npm install --production --engine-strict --ignore-scripts --no-package-lock
+      # Clean up the production install, before installing dev/production:
+      - run: rm -rf node_modules
+      - run: npm install
+      - run: npm test
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+      - run: npm install
+      - run: npm test
diff --git a/.gitignore b/.gitignore
index fd4f2b0..b600741 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
+coverage
 node_modules
 .DS_Store
diff --git a/index.js b/index.js
index c091989..02ef57a 100644
--- a/index.js
+++ b/index.js
@@ -25,7 +25,8 @@ async function main () {
   // First we check for any merged release PRs (PRs merged with the label
   // "autorelease: pending"):
   if (!command || command === 'github-release') {
-    const gr = new GitHubRelease({
+    const Release = releasePlease.getGitHubRelease()
+    const gr = new Release({
       label: RELEASE_LABEL,
       repoUrl: process.env.GITHUB_REPOSITORY,
       packageName,
@@ -45,7 +46,7 @@ async function main () {
   // Next we check for PRs merged since the last release, and groom the
   // release PR:
   if (!command || command === 'release-pr') {
-    const release = ReleasePRFactory.buildStatic(releaseType, {
+    const release = releasePlease.getReleasePRFactory().buildStatic(releaseType, {
       monorepoTags,
       packageName,
       path,
@@ -62,6 +63,24 @@ async function main () {
   }
 }
 
-main().catch(err => {
-  core.setFailed(`release-please failed: ${err.message}`)
-})
+function getGitHubRelease () {
+  return GitHubRelease
+}
+
+function getReleasePRFactory () {
+  return ReleasePRFactory
+}
+
+const releasePlease = {
+  main,
+  getGitHubRelease,
+  getReleasePRFactory
+}
+
+if (require.main === module) {
+  main().catch(err => {
+    core.setFailed(`release-please failed: ${err.message}`)
+  })
+} else {
+  module.exports = releasePlease
+}
diff --git a/package-lock.json b/package-lock.json
index 51fb087..644f9d7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -78,6 +78,18 @@
         }
       }
     },
+    "@bcoe/v8-coverage": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-0.2.3.tgz",
+      "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
+      "dev": true
+    },
+    "@istanbuljs/schema": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.2.tgz",
+      "integrity": "sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==",
+      "dev": true
+    },
     "@octokit/auth-token": {
       "version": "2.4.3",
       "resolved": "https://registry.npmjs.org/@octokit/auth-token/-/auth-token-2.4.3.tgz",
@@ -185,11 +197,68 @@
         "@types/node": ">= 8"
       }
     },
+    "@sinonjs/commons": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.1.tgz",
+      "integrity": "sha512-892K+kWUUi3cl+LlqEWIDrhvLgdL79tECi8JZUyq6IviKy/DNhuzCRlbHUjxK89f4ypPMMaFnFuR9Ie6DoIMsw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "4.0.8"
+      }
+    },
+    "@sinonjs/fake-timers": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-6.0.1.tgz",
+      "integrity": "sha512-MZPUxrmFubI36XS1DI3qmI0YdN1gks62JtFZvxR67ljjSNCeK6U08Zx4msEWOXuofgqUt6zPHSi1H9fbjR/NRA==",
+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^1.7.0"
+      }
+    },
+    "@sinonjs/formatio": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-5.0.1.tgz",
+      "integrity": "sha512-KaiQ5pBf1MpS09MuA0kp6KBQt2JUOQycqVG1NZXvzeaXe5LGFqAKueIS0bw4w0P9r7KuBSVdUk5QjXsUdu2CxQ==",
+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^1",
+        "@sinonjs/samsam": "^5.0.2"
+      }
+    },
+    "@sinonjs/samsam": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-5.3.0.tgz",
+      "integrity": "sha512-hXpcfx3aq+ETVBwPlRFICld5EnrkexXuXDwqUNhDdr5L8VjvMeSRwyOa0qL7XFmR+jVWR4rUZtnxlG7RX72sBg==",
+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^1.6.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
+      }
+    },
+    "@sinonjs/text-encoding": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.1.tgz",
+      "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
+      "dev": true
+    },
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
     },
+    "@types/is-windows": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/is-windows/-/is-windows-1.0.0.tgz",
+      "integrity": "sha512-tJ1rq04tGKuIJoWIH0Gyuwv4RQ3+tIu7wQrC0MV47raQ44kIzXSSFKfrxFUOWVRvesoF7mrTqigXmqoZJsXwTg==",
+      "dev": true
+    },
+    "@types/istanbul-lib-coverage": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.3.tgz",
+      "integrity": "sha512-sz7iLqvVUg1gIedBOvlkxPlc8/uVzyS5OwGz1cKjXzkl3FpL3al0crU8YGU1WoHkxn0Wxbw5tyi6hvzJKNzFsw==",
+      "dev": true
+    },
     "@types/minimist": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.1.tgz",
@@ -218,6 +287,12 @@
       "resolved": "https://registry.npmjs.org/@types/yargs-parser/-/yargs-parser-15.0.0.tgz",
       "integrity": "sha512-FA/BWv8t8ZWJ+gEOnLLd8ygxH/2UFbAvgEonyfN6yWGLKc7zVjbpl2Y4CTjid9h2RfgPP6SEt6uHwEOply00yw=="
     },
+    "@ungap/promise-all-settled": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
+      "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
+      "dev": true
+    },
     "@zeit/ncc": {
       "version": "0.22.3",
       "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.22.3.tgz",
@@ -257,6 +332,12 @@
         "uri-js": "^4.2.2"
       }
     },
+    "ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true
+    },
     "ansi-escapes": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
@@ -288,6 +369,16 @@
         "color-convert": "^2.0.1"
       }
     },
+    "anymatch": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -347,6 +438,12 @@
       "resolved": "https://registry.npmjs.org/before-after-hook/-/before-after-hook-2.1.0.tgz",
       "integrity": "sha512-IWIbu7pMqyw3EAJHzzHbWa85b6oud/yfKYg5rqB5hNE8CeMi3nX+2C2sj0HswfblST86hpVEOAb9x34NZd6P7A=="
     },
+    "binary-extensions": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.1.0.tgz",
+      "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -356,11 +453,95 @@
         "concat-map": "0.0.1"
       }
     },
+    "braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "requires": {
+        "fill-range": "^7.0.1"
+      }
+    },
+    "browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
     },
+    "c8": {
+      "version": "7.3.5",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-7.3.5.tgz",
+      "integrity": "sha512-VNiZoxnInBJLW8uUuyLkiqMKWh1OAsYS+DjWsMhvcrfGPrVx3vwqD9627/7ZhFSF86MCBINDi+PD6Midw0KHRg==",
+      "dev": true,
+      "requires": {
+        "@bcoe/v8-coverage": "^0.2.3",
+        "@istanbuljs/schema": "^0.1.2",
+        "find-up": "^5.0.0",
+        "foreground-child": "^2.0.0",
+        "furi": "^2.0.0",
+        "istanbul-lib-coverage": "^3.0.0",
+        "istanbul-lib-report": "^3.0.0",
+        "istanbul-reports": "^3.0.2",
+        "rimraf": "^3.0.0",
+        "test-exclude": "^6.0.0",
+        "v8-to-istanbul": "^7.0.0",
+        "yargs": "^16.0.0",
+        "yargs-parser": "^20.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+          "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^6.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
+          "integrity": "sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^5.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.0.2.tgz",
+          "integrity": "sha512-iwqZSOoWIW+Ew4kAGUlN16J4M7OB3ysMLSZtnhmqx7njIHFPlxWBX8xo3lVTyFVq6mI/lL9qt2IsN1sHwaxJkg==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
+          "integrity": "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^3.0.2"
+          }
+        },
+        "rimraf": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
+        }
+      }
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -397,6 +578,22 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "chokidar": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.4.3.tgz",
+      "integrity": "sha512-DtM3g7juCXQxFVSNPNByEC2+NImtBuxQQvWlHunpJIS5Ocr0lG306cC7FCi7cEA0fzmybPUIl4txBIobk1gGOQ==",
+      "dev": true,
+      "requires": {
+        "anymatch": "~3.1.1",
+        "braces": "~3.0.2",
+        "fsevents": "~2.1.2",
+        "glob-parent": "~5.1.0",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.5.0"
+      }
+    },
     "cli-cursor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@@ -538,6 +735,23 @@
         "trim-off-newlines": "^1.0.0"
       }
     },
+    "convert-source-map": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.7.0.tgz",
+      "integrity": "sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.1"
+      },
+      "dependencies": {
+        "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
+        }
+      }
+    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -1244,6 +1458,15 @@
         "flat-cache": "^2.0.1"
       }
     },
+    "fill-range": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
+      "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+      "dev": true,
+      "requires": {
+        "to-regex-range": "^5.0.1"
+      }
+    },
     "find-root": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/find-root/-/find-root-1.1.0.tgz",
@@ -1259,6 +1482,12 @@
         "path-exists": "^4.0.0"
       }
     },
+    "flat": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
+      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+      "dev": true
+    },
     "flat-cache": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
@@ -1281,11 +1510,71 @@
       "integrity": "sha512-r5wGx7YeOwNWNlCA0wQ86zKyDLMQr+/RB8xy74M4hTphfmjlijTSSXGuH8rnvKZnfT9i+75zmd8jcKdMR4O6jA==",
       "dev": true
     },
+    "foreground-child": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-2.0.0.tgz",
+      "integrity": "sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^7.0.0",
+        "signal-exit": "^3.0.2"
+      },
+      "dependencies": {
+        "cross-spawn": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
+          "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
+          "dev": true,
+          "requires": {
+            "path-key": "^3.1.0",
+            "shebang-command": "^2.0.0",
+            "which": "^2.0.1"
+          }
+        },
+        "path-key": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+          "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+          "dev": true
+        },
+        "shebang-command": {
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+    "workerpool": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.2.tgz",
+      "integrity": "sha512-DSNyvOpFKrNusaaUwk+ej6cBj1bmhLcBfj80elGk+ZIo5JSkq+unB1dLKEOcNfJDZgjGICfhQ0Q5TbP0PvF4+Q==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -2969,6 +3861,38 @@
       "version": "20.2.4",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
       "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
+    },
+    "yargs-unparser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
+          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
+          "dev": true
+        },
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
+          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
+          "dev": true
+        },
+        "is-plain-obj": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
+          "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
+          "dev": true
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 69323da..b3154e4 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "description": "automated releases based on conventional commits",
   "main": "index.js",
   "scripts": {
-    "test": "standard",
+    "test": "c8 mocha test/*.js",
+    "posttest": "standard",
     "fix": "standard --fix",
     "build": "ncc build index.js"
   },
@@ -29,6 +30,9 @@
   },
   "devDependencies": {
     "@zeit/ncc": "^0.22.3",
+    "c8": "^7.3.5",
+    "mocha": "^8.2.1",
+    "sinon": "^9.2.1",
     "standard": "^14.3.4"
   },
   "standard": {
diff --git a/test/release-please.js b/test/release-please.js
new file mode 100644
index 0000000..f3a09c7
--- /dev/null
+++ b/test/release-please.js
@@ -0,0 +1,119 @@
+const { describe, it } = require('mocha')
+const action = require('../')
+const assert = require('assert')
+const core = require('@actions/core')
+const sinon = require('sinon')
+
+describe('release-please-action', () => {
+  it('both opens PR and tags GitHub releases by default', async () => {
+    const output = {}
+    core.setOutput = (name, value) => {
+      output[name] = value
+    }
+    const input = {
+      'release-type': 'node'
+    }
+    core.getInput = (name) => {
+      return input[name]
+    }
+    const createRelease = sinon.stub().returns({
+      upload_url: 'http://example.com',
+      tag_name: 'v1.0.0'
+    })
+    action.getGitHubRelease = () => {
+      class Release {}
+      Release.prototype.createRelease = createRelease
+      return Release
+    }
+    const releasePR = sinon.stub()
+    action.getReleasePRFactory = () => {
+      return {
+        buildStatic: () => {
+          return {
+            run: releasePR
+          }
+        }
+      }
+    }
+    await action.main()
+    sinon.assert.calledOnce(createRelease)
+    sinon.assert.calledOnce(releasePR)
+    assert.deepStrictEqual(output, {
+      release_created: true,
+      upload_url: 'http://example.com',
+      tag_name: 'v1.0.0'
+    })
+  })
+
+  it('only opens PRs if, command set to release-pr', async () => {
+    const output = {}
+    core.setOutput = (name, value) => {
+      output[name] = value
+    }
+    const input = {
+      'release-type': 'node',
+      command: 'release-pr'
+    }
+    core.getInput = (name) => {
+      return input[name]
+    }
+    const githubRelease = sinon.stub().returns({
+      upload_url: 'http://example.com',
+      tag_name: 'v1.0.0'
+    })
+    action.getGitHubRelease = () => {
+      class Release {}
+      Release.prototype.createRelease = githubRelease
+      return Release
+    }
+    const releasePR = sinon.stub()
+    action.getReleasePRFactory = () => {
+      return {
+        buildStatic: () => {
+          return {
+            run: releasePR
+          }
+        }
+      }
+    }
+    await action.main()
+    sinon.assert.notCalled(githubRelease)
+    sinon.assert.calledOnce(releasePR)
+  })
+
+  it('only opens tags releases, if command set to github-release', async () => {
+    const output = {}
+    core.setOutput = (name, value) => {
+      output[name] = value
+    }
+    const input = {
+      'release-type': 'node',
+      command: 'github-release'
+    }
+    core.getInput = (name) => {
+      return input[name]
+    }
+    const githubRelease = sinon.stub().returns({
+      upload_url: 'http://example.com',
+      tag_name: 'v1.0.0'
+    })
+    action.getGitHubRelease = () => {
+      class Release {}
+      Release.prototype.createRelease = githubRelease
+      return Release
+    }
+    const releasePR = sinon.stub()
+    action.getReleasePRFactory = () => {
+      return {
+        buildStatic: () => {
+          return {
+            run: releasePR
+          }
+        }
+      }
+    }
+    await action.main()
+    sinon.assert.calledOnce(githubRelease)
+    sinon.assert.notCalled(releasePR)
+  })
+})