diff --git a/src/github-handler/index.ts b/src/github-handler/index.ts
index 6d0071b6..a07cbfa8 100644
--- a/src/github-handler/index.ts
+++ b/src/github-handler/index.ts
@@ -1,2 +1,3 @@
 export * from './fork-handler';
 export {branch} from './branch-handler';
+export * from './pr-handler';
diff --git a/src/github-handler/pr-handler.ts b/src/github-handler/pr-handler.ts
new file mode 100644
index 00000000..de6cf976
--- /dev/null
+++ b/src/github-handler/pr-handler.ts
@@ -0,0 +1,57 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import {BranchDomain, Description, Logger, Octokit, RepoDomain} from '../types';
+
+const DEFAULT_PRIMARY = 'master';
+
+/**
+ * Create a GitHub PR on the upstream organization's repo
+ * Throws an error if the GitHub API fails
+ * @param {Logger} logger The logger instance
+ * @param {Octokit} octokit The authenticated octokit instance
+ * @param {RepoDomain} upstream The upstream repository
+ * @param {BranchDomain} origin The remote origin information that contains the origin branch
+ * @param {Description} description The pull request title and detailed description
+ * @param {boolean} maintainersCanModify Whether or not maintainers can modify the pull request. Default is true
+ * @param {string} upstreamPrimary The upstream repository's primary branch. Default is master.
+ * @returns {Promise<void>}
+ */
+async function openPR(
+  logger: Logger,
+  octokit: Octokit,
+  upstream: RepoDomain,
+  origin: BranchDomain,
+  description: Description,
+  maintainersCanModify = true,
+  upstreamPrimary: string = DEFAULT_PRIMARY
+): Promise<void> {
+  // TODO - autosync fork, update branch, and re-apply changes
+  const pullResponseData = (
+    await octokit.pulls.create({
+      owner: upstream.owner,
+      repo: origin.repo,
+      title: description.title,
+      head: `${origin.owner}:${origin.branch}`,
+      base: upstreamPrimary,
+      body: description.body,
+      maintainer_can_modify: maintainersCanModify,
+    })
+  ).data;
+  logger.info(
+    `Successfully opened pull request available at url: ${pullResponseData.url}.`
+  );
+}
+
+export {openPR};
diff --git a/src/types/index.ts b/src/types/index.ts
index 74f87f67..918d60c7 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -28,6 +28,21 @@ interface RepoDomain {
   owner: string;
 }
 
+/**
+ * The domain for a branch
+ */
+interface BranchDomain extends RepoDomain {
+  branch: string;
+}
+
+/**
+ * The descriptive properties for any entity
+ */
+interface Description {
+  title: string;
+  body: string;
+}
+
 /**
  * The user parameter for GitHub data needed for creating a PR
  */
@@ -61,6 +76,8 @@ interface GitHubContext {
 }
 
 export {
+  BranchDomain,
+  Description,
   Files,
   GitHubContextParam,
   GitHubContext,
diff --git a/test/fixtures/create-pr-response.json b/test/fixtures/create-pr-response.json
new file mode 100644
index 00000000..a22c1f93
--- /dev/null
+++ b/test/fixtures/create-pr-response.json
@@ -0,0 +1,524 @@
+{
+    "url": "https://api.github.com/repos/octocat/Hello-World/pulls/1347",
+    "id": 1,
+    "node_id": "MDExOlB1bGxSZXF1ZXN0MQ==",
+    "html_url": "https://github.com/octocat/Hello-World/pull/1347",
+    "diff_url": "https://github.com/octocat/Hello-World/pull/1347.diff",
+    "patch_url": "https://github.com/octocat/Hello-World/pull/1347.patch",
+    "issue_url": "https://api.github.com/repos/octocat/Hello-World/issues/1347",
+    "commits_url": "https://api.github.com/repos/octocat/Hello-World/pulls/1347/commits",
+    "review_comments_url": "https://api.github.com/repos/octocat/Hello-World/pulls/1347/comments",
+    "review_comment_url": "https://api.github.com/repos/octocat/Hello-World/pulls/comments{/number}",
+    "comments_url": "https://api.github.com/repos/octocat/Hello-World/issues/1347/comments",
+    "statuses_url": "https://api.github.com/repos/octocat/Hello-World/statuses/6dcb09b5b57875f334f61aebed695e2e4193db5e",
+    "number": 1347,
+    "state": "open",
+    "locked": true,
+    "title": "Amazing new feature",
+    "user": {
+      "login": "octocat",
+      "id": 1,
+      "node_id": "MDQ6VXNlcjE=",
+      "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/octocat",
+      "html_url": "https://github.com/octocat",
+      "followers_url": "https://api.github.com/users/octocat/followers",
+      "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+      "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+      "organizations_url": "https://api.github.com/users/octocat/orgs",
+      "repos_url": "https://api.github.com/users/octocat/repos",
+      "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/octocat/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "body": "Please pull these awesome changes in!",
+    "labels": [
+      {
+        "id": 208045946,
+        "node_id": "MDU6TGFiZWwyMDgwNDU5NDY=",
+        "url": "https://api.github.com/repos/octocat/Hello-World/labels/bug",
+        "name": "bug",
+        "description": "Something isn't working",
+        "color": "f29513",
+        "default": true
+      }
+    ],
+    "milestone": {
+      "url": "https://api.github.com/repos/octocat/Hello-World/milestones/1",
+      "html_url": "https://github.com/octocat/Hello-World/milestones/v1.0",
+      "labels_url": "https://api.github.com/repos/octocat/Hello-World/milestones/1/labels",
+      "id": 1002604,
+      "node_id": "MDk6TWlsZXN0b25lMTAwMjYwNA==",
+      "number": 1,
+      "state": "open",
+      "title": "v1.0",
+      "description": "Tracking milestone for version 1.0",
+      "creator": {
+        "login": "octocat",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/octocat",
+        "html_url": "https://github.com/octocat",
+        "followers_url": "https://api.github.com/users/octocat/followers",
+        "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+        "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+        "organizations_url": "https://api.github.com/users/octocat/orgs",
+        "repos_url": "https://api.github.com/users/octocat/repos",
+        "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/octocat/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "open_issues": 4,
+      "closed_issues": 8,
+      "created_at": "2011-04-10T20:09:31Z",
+      "updated_at": "2014-03-03T18:58:10Z",
+      "closed_at": "2013-02-12T13:22:01Z",
+      "due_on": "2012-10-09T23:39:01Z"
+    },
+    "active_lock_reason": "too heated",
+    "created_at": "2011-01-26T19:01:12Z",
+    "updated_at": "2011-01-26T19:01:12Z",
+    "closed_at": "2011-01-26T19:01:12Z",
+    "merged_at": "2011-01-26T19:01:12Z",
+    "merge_commit_sha": "e5bd3914e2e596debea16f433f57875b5b90bcd6",
+    "assignee": {
+      "login": "octocat",
+      "id": 1,
+      "node_id": "MDQ6VXNlcjE=",
+      "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/octocat",
+      "html_url": "https://github.com/octocat",
+      "followers_url": "https://api.github.com/users/octocat/followers",
+      "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+      "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+      "organizations_url": "https://api.github.com/users/octocat/orgs",
+      "repos_url": "https://api.github.com/users/octocat/repos",
+      "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/octocat/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "assignees": [
+      {
+        "login": "octocat",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/octocat",
+        "html_url": "https://github.com/octocat",
+        "followers_url": "https://api.github.com/users/octocat/followers",
+        "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+        "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+        "organizations_url": "https://api.github.com/users/octocat/orgs",
+        "repos_url": "https://api.github.com/users/octocat/repos",
+        "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/octocat/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      {
+        "login": "hubot",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/hubot_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/hubot",
+        "html_url": "https://github.com/hubot",
+        "followers_url": "https://api.github.com/users/hubot/followers",
+        "following_url": "https://api.github.com/users/hubot/following{/other_user}",
+        "gists_url": "https://api.github.com/users/hubot/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/hubot/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/hubot/subscriptions",
+        "organizations_url": "https://api.github.com/users/hubot/orgs",
+        "repos_url": "https://api.github.com/users/hubot/repos",
+        "events_url": "https://api.github.com/users/hubot/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/hubot/received_events",
+        "type": "User",
+        "site_admin": true
+      }
+    ],
+    "requested_reviewers": [
+      {
+        "login": "other_user",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/other_user_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/other_user",
+        "html_url": "https://github.com/other_user",
+        "followers_url": "https://api.github.com/users/other_user/followers",
+        "following_url": "https://api.github.com/users/other_user/following{/other_user}",
+        "gists_url": "https://api.github.com/users/other_user/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/other_user/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/other_user/subscriptions",
+        "organizations_url": "https://api.github.com/users/other_user/orgs",
+        "repos_url": "https://api.github.com/users/other_user/repos",
+        "events_url": "https://api.github.com/users/other_user/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/other_user/received_events",
+        "type": "User",
+        "site_admin": false
+      }
+    ],
+    "requested_teams": [
+      {
+        "id": 1,
+        "node_id": "MDQ6VGVhbTE=",
+        "url": "https://api.github.com/teams/1",
+        "html_url": "https://api.github.com/teams/justice-league",
+        "name": "Justice League",
+        "slug": "justice-league",
+        "description": "A great team.",
+        "privacy": "closed",
+        "permission": "admin",
+        "members_url": "https://api.github.com/teams/1/members{/member}",
+        "repositories_url": "https://api.github.com/teams/1/repos",
+        "parent": "null"
+      }
+    ],
+    "head": {
+      "label": "octocat:new-topic",
+      "ref": "new-topic",
+      "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+      "user": {
+        "login": "octocat",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/octocat",
+        "html_url": "https://github.com/octocat",
+        "followers_url": "https://api.github.com/users/octocat/followers",
+        "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+        "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+        "organizations_url": "https://api.github.com/users/octocat/orgs",
+        "repos_url": "https://api.github.com/users/octocat/repos",
+        "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/octocat/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "repo": {
+        "id": 1296269,
+        "node_id": "MDEwOlJlcG9zaXRvcnkxMjk2MjY5",
+        "name": "Hello-World",
+        "full_name": "octocat/Hello-World",
+        "owner": {
+          "login": "octocat",
+          "id": 1,
+          "node_id": "MDQ6VXNlcjE=",
+          "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+          "gravatar_id": "",
+          "url": "https://api.github.com/users/octocat",
+          "html_url": "https://github.com/octocat",
+          "followers_url": "https://api.github.com/users/octocat/followers",
+          "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+          "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+          "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+          "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+          "organizations_url": "https://api.github.com/users/octocat/orgs",
+          "repos_url": "https://api.github.com/users/octocat/repos",
+          "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+          "received_events_url": "https://api.github.com/users/octocat/received_events",
+          "type": "User",
+          "site_admin": false
+        },
+        "private": false,
+        "html_url": "https://github.com/octocat/Hello-World",
+        "description": "This your first repo!",
+        "fork": false,
+        "url": "https://api.github.com/repos/octocat/Hello-World",
+        "archive_url": "http://api.github.com/repos/octocat/Hello-World/{archive_format}{/ref}",
+        "assignees_url": "http://api.github.com/repos/octocat/Hello-World/assignees{/user}",
+        "blobs_url": "http://api.github.com/repos/octocat/Hello-World/git/blobs{/sha}",
+        "branches_url": "http://api.github.com/repos/octocat/Hello-World/branches{/branch}",
+        "collaborators_url": "http://api.github.com/repos/octocat/Hello-World/collaborators{/collaborator}",
+        "comments_url": "http://api.github.com/repos/octocat/Hello-World/comments{/number}",
+        "commits_url": "http://api.github.com/repos/octocat/Hello-World/commits{/sha}",
+        "compare_url": "http://api.github.com/repos/octocat/Hello-World/compare/{base}...{head}",
+        "contents_url": "http://api.github.com/repos/octocat/Hello-World/contents/{+path}",
+        "contributors_url": "http://api.github.com/repos/octocat/Hello-World/contributors",
+        "deployments_url": "http://api.github.com/repos/octocat/Hello-World/deployments",
+        "downloads_url": "http://api.github.com/repos/octocat/Hello-World/downloads",
+        "events_url": "http://api.github.com/repos/octocat/Hello-World/events",
+        "forks_url": "http://api.github.com/repos/octocat/Hello-World/forks",
+        "git_commits_url": "http://api.github.com/repos/octocat/Hello-World/git/commits{/sha}",
+        "git_refs_url": "http://api.github.com/repos/octocat/Hello-World/git/refs{/sha}",
+        "git_tags_url": "http://api.github.com/repos/octocat/Hello-World/git/tags{/sha}",
+        "git_url": "git:github.com/octocat/Hello-World.git",
+        "issue_comment_url": "http://api.github.com/repos/octocat/Hello-World/issues/comments{/number}",
+        "issue_events_url": "http://api.github.com/repos/octocat/Hello-World/issues/events{/number}",
+        "issues_url": "http://api.github.com/repos/octocat/Hello-World/issues{/number}",
+        "keys_url": "http://api.github.com/repos/octocat/Hello-World/keys{/key_id}",
+        "labels_url": "http://api.github.com/repos/octocat/Hello-World/labels{/name}",
+        "languages_url": "http://api.github.com/repos/octocat/Hello-World/languages",
+        "merges_url": "http://api.github.com/repos/octocat/Hello-World/merges",
+        "milestones_url": "http://api.github.com/repos/octocat/Hello-World/milestones{/number}",
+        "notifications_url": "http://api.github.com/repos/octocat/Hello-World/notifications{?since,all,participating}",
+        "pulls_url": "http://api.github.com/repos/octocat/Hello-World/pulls{/number}",
+        "releases_url": "http://api.github.com/repos/octocat/Hello-World/releases{/id}",
+        "ssh_url": "git@github.com:octocat/Hello-World.git",
+        "stargazers_url": "http://api.github.com/repos/octocat/Hello-World/stargazers",
+        "statuses_url": "http://api.github.com/repos/octocat/Hello-World/statuses/{sha}",
+        "subscribers_url": "http://api.github.com/repos/octocat/Hello-World/subscribers",
+        "subscription_url": "http://api.github.com/repos/octocat/Hello-World/subscription",
+        "tags_url": "http://api.github.com/repos/octocat/Hello-World/tags",
+        "teams_url": "http://api.github.com/repos/octocat/Hello-World/teams",
+        "trees_url": "http://api.github.com/repos/octocat/Hello-World/git/trees{/sha}",
+        "clone_url": "https://github.com/octocat/Hello-World.git",
+        "mirror_url": "git:git.example.com/octocat/Hello-World",
+        "hooks_url": "http://api.github.com/repos/octocat/Hello-World/hooks",
+        "svn_url": "https://svn.github.com/octocat/Hello-World",
+        "homepage": "https://github.com",
+        "language": "null",
+        "forks_count": 9,
+        "stargazers_count": 80,
+        "watchers_count": 80,
+        "size": 108,
+        "default_branch": "master",
+        "open_issues_count": 0,
+        "is_template": true,
+        "topics": [
+          "octocat",
+          "atom",
+          "electron",
+          "api"
+        ],
+        "has_issues": true,
+        "has_projects": true,
+        "has_wiki": true,
+        "has_pages": false,
+        "has_downloads": true,
+        "archived": false,
+        "disabled": false,
+        "visibility": "public",
+        "pushed_at": "2011-01-26T19:06:43Z",
+        "created_at": "2011-01-26T19:01:12Z",
+        "updated_at": "2011-01-26T19:14:43Z",
+        "permissions": {
+          "admin": false,
+          "push": false,
+          "pull": true
+        },
+        "allow_rebase_merge": true,
+        "template_repository": "null",
+        "temp_clone_token": "ABTLWHOULUVAXGTRYU7OC2876QJ2O",
+        "allow_squash_merge": true,
+        "delete_branch_on_merge": true,
+        "allow_merge_commit": true,
+        "subscribers_count": 42,
+        "network_count": 0
+      }
+    },
+    "base": {
+      "label": "octocat:master",
+      "ref": "master",
+      "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+      "user": {
+        "login": "octocat",
+        "id": 1,
+        "node_id": "MDQ6VXNlcjE=",
+        "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/octocat",
+        "html_url": "https://github.com/octocat",
+        "followers_url": "https://api.github.com/users/octocat/followers",
+        "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+        "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+        "organizations_url": "https://api.github.com/users/octocat/orgs",
+        "repos_url": "https://api.github.com/users/octocat/repos",
+        "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/octocat/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "repo": {
+        "id": 1296269,
+        "node_id": "MDEwOlJlcG9zaXRvcnkxMjk2MjY5",
+        "name": "Hello-World",
+        "full_name": "octocat/Hello-World",
+        "owner": {
+          "login": "octocat",
+          "id": 1,
+          "node_id": "MDQ6VXNlcjE=",
+          "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+          "gravatar_id": "",
+          "url": "https://api.github.com/users/octocat",
+          "html_url": "https://github.com/octocat",
+          "followers_url": "https://api.github.com/users/octocat/followers",
+          "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+          "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+          "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+          "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+          "organizations_url": "https://api.github.com/users/octocat/orgs",
+          "repos_url": "https://api.github.com/users/octocat/repos",
+          "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+          "received_events_url": "https://api.github.com/users/octocat/received_events",
+          "type": "User",
+          "site_admin": false
+        },
+        "private": false,
+        "html_url": "https://github.com/octocat/Hello-World",
+        "description": "This your first repo!",
+        "fork": false,
+        "url": "https://api.github.com/repos/octocat/Hello-World",
+        "archive_url": "http://api.github.com/repos/octocat/Hello-World/{archive_format}{/ref}",
+        "assignees_url": "http://api.github.com/repos/octocat/Hello-World/assignees{/user}",
+        "blobs_url": "http://api.github.com/repos/octocat/Hello-World/git/blobs{/sha}",
+        "branches_url": "http://api.github.com/repos/octocat/Hello-World/branches{/branch}",
+        "collaborators_url": "http://api.github.com/repos/octocat/Hello-World/collaborators{/collaborator}",
+        "comments_url": "http://api.github.com/repos/octocat/Hello-World/comments{/number}",
+        "commits_url": "http://api.github.com/repos/octocat/Hello-World/commits{/sha}",
+        "compare_url": "http://api.github.com/repos/octocat/Hello-World/compare/{base}...{head}",
+        "contents_url": "http://api.github.com/repos/octocat/Hello-World/contents/{+path}",
+        "contributors_url": "http://api.github.com/repos/octocat/Hello-World/contributors",
+        "deployments_url": "http://api.github.com/repos/octocat/Hello-World/deployments",
+        "downloads_url": "http://api.github.com/repos/octocat/Hello-World/downloads",
+        "events_url": "http://api.github.com/repos/octocat/Hello-World/events",
+        "forks_url": "http://api.github.com/repos/octocat/Hello-World/forks",
+        "git_commits_url": "http://api.github.com/repos/octocat/Hello-World/git/commits{/sha}",
+        "git_refs_url": "http://api.github.com/repos/octocat/Hello-World/git/refs{/sha}",
+        "git_tags_url": "http://api.github.com/repos/octocat/Hello-World/git/tags{/sha}",
+        "git_url": "git:github.com/octocat/Hello-World.git",
+        "issue_comment_url": "http://api.github.com/repos/octocat/Hello-World/issues/comments{/number}",
+        "issue_events_url": "http://api.github.com/repos/octocat/Hello-World/issues/events{/number}",
+        "issues_url": "http://api.github.com/repos/octocat/Hello-World/issues{/number}",
+        "keys_url": "http://api.github.com/repos/octocat/Hello-World/keys{/key_id}",
+        "labels_url": "http://api.github.com/repos/octocat/Hello-World/labels{/name}",
+        "languages_url": "http://api.github.com/repos/octocat/Hello-World/languages",
+        "merges_url": "http://api.github.com/repos/octocat/Hello-World/merges",
+        "milestones_url": "http://api.github.com/repos/octocat/Hello-World/milestones{/number}",
+        "notifications_url": "http://api.github.com/repos/octocat/Hello-World/notifications{?since,all,participating}",
+        "pulls_url": "http://api.github.com/repos/octocat/Hello-World/pulls{/number}",
+        "releases_url": "http://api.github.com/repos/octocat/Hello-World/releases{/id}",
+        "ssh_url": "git@github.com:octocat/Hello-World.git",
+        "stargazers_url": "http://api.github.com/repos/octocat/Hello-World/stargazers",
+        "statuses_url": "http://api.github.com/repos/octocat/Hello-World/statuses/{sha}",
+        "subscribers_url": "http://api.github.com/repos/octocat/Hello-World/subscribers",
+        "subscription_url": "http://api.github.com/repos/octocat/Hello-World/subscription",
+        "tags_url": "http://api.github.com/repos/octocat/Hello-World/tags",
+        "teams_url": "http://api.github.com/repos/octocat/Hello-World/teams",
+        "trees_url": "http://api.github.com/repos/octocat/Hello-World/git/trees{/sha}",
+        "clone_url": "https://github.com/octocat/Hello-World.git",
+        "mirror_url": "git:git.example.com/octocat/Hello-World",
+        "hooks_url": "http://api.github.com/repos/octocat/Hello-World/hooks",
+        "svn_url": "https://svn.github.com/octocat/Hello-World",
+        "homepage": "https://github.com",
+        "language": "null",
+        "forks_count": 9,
+        "stargazers_count": 80,
+        "watchers_count": 80,
+        "size": 108,
+        "default_branch": "master",
+        "open_issues_count": 0,
+        "is_template": true,
+        "topics": [
+          "octocat",
+          "atom",
+          "electron",
+          "api"
+        ],
+        "has_issues": true,
+        "has_projects": true,
+        "has_wiki": true,
+        "has_pages": false,
+        "has_downloads": true,
+        "archived": false,
+        "disabled": false,
+        "visibility": "public",
+        "pushed_at": "2011-01-26T19:06:43Z",
+        "created_at": "2011-01-26T19:01:12Z",
+        "updated_at": "2011-01-26T19:14:43Z",
+        "permissions": {
+          "admin": false,
+          "push": false,
+          "pull": true
+        },
+        "allow_rebase_merge": true,
+        "template_repository": "null",
+        "temp_clone_token": "ABTLWHOULUVAXGTRYU7OC2876QJ2O",
+        "allow_squash_merge": true,
+        "delete_branch_on_merge": true,
+        "allow_merge_commit": true,
+        "subscribers_count": 42,
+        "network_count": 0
+      }
+    },
+    "_links": {
+      "self": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/pulls/1347"
+      },
+      "html": {
+        "href": "https://github.com/octocat/Hello-World/pull/1347"
+      },
+      "issue": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/issues/1347"
+      },
+      "comments": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/issues/1347/comments"
+      },
+      "review_comments": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/pulls/1347/comments"
+      },
+      "review_comment": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/pulls/comments{/number}"
+      },
+      "commits": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/pulls/1347/commits"
+      },
+      "statuses": {
+        "href": "https://api.github.com/repos/octocat/Hello-World/statuses/6dcb09b5b57875f334f61aebed695e2e4193db5e"
+      }
+    },
+    "author_association": "OWNER",
+    "draft": false,
+    "merged": false,
+    "mergeable": true,
+    "rebaseable": true,
+    "mergeable_state": "clean",
+    "merged_by": {
+      "login": "octocat",
+      "id": 1,
+      "node_id": "MDQ6VXNlcjE=",
+      "avatar_url": "https://github.com/images/error/octocat_happy.gif",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/octocat",
+      "html_url": "https://github.com/octocat",
+      "followers_url": "https://api.github.com/users/octocat/followers",
+      "following_url": "https://api.github.com/users/octocat/following{/other_user}",
+      "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
+      "organizations_url": "https://api.github.com/users/octocat/orgs",
+      "repos_url": "https://api.github.com/users/octocat/repos",
+      "events_url": "https://api.github.com/users/octocat/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/octocat/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "comments": 10,
+    "review_comments": 0,
+    "maintainer_can_modify": true,
+    "commits": 3,
+    "additions": 100,
+    "deletions": 3,
+    "changed_files": 5
+  }
\ No newline at end of file
diff --git a/test/pr.ts b/test/pr.ts
new file mode 100644
index 00000000..202b8482
--- /dev/null
+++ b/test/pr.ts
@@ -0,0 +1,82 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import {expect} from 'chai';
+import {describe, it, before} from 'mocha';
+import {logger, octokit, setup} from './util';
+import * as sinon from 'sinon';
+import {openPR} from '../src/github-handler/pr-handler';
+
+before(() => {
+  setup();
+});
+
+describe('Opening a pull request', async () => {
+  const upstream = {owner: 'upstream-owner', repo: 'upstream-repo'};
+  const origin = {
+    owner: 'origin-owner',
+    repo: 'origin-repo',
+    branch: 'pr-test-branch',
+  };
+  const responseData = await import('./fixtures/create-pr-response.json');
+  const description = {
+    title: 'PR-TITLE',
+    body: 'PR-DESCRIPTION',
+  };
+
+  describe('Octokit create function', () => {
+    it('Is called with the correct values and defaults', async () => {
+      const createRefResponse = {
+        headers: {},
+        status: 200,
+        url: 'http://fake-url.com',
+        data: responseData,
+      };
+      // setup
+      const stub = sinon
+        .stub(octokit.pulls, 'create')
+        .resolves(createRefResponse);
+      // tests
+      await openPR(logger, octokit, upstream, origin, description);
+      sinon.assert.calledOnceWithExactly(stub, {
+        owner: upstream.owner,
+        repo: origin.repo,
+        title: description.title,
+        head: 'origin-owner:pr-test-branch',
+        base: 'master',
+        body: description.body,
+        maintainer_can_modify: true,
+      });
+      // restore
+      stub.restore();
+    });
+  });
+
+  describe('Open PR function', () => {
+    it('Passes up the error message with a throw when octokit fails', async () => {
+      // setup
+      const errorMsg = 'Error message';
+      const stub = sinon.stub(octokit.pulls, 'create').rejects(Error(errorMsg));
+      try {
+        await openPR(logger, octokit, upstream, origin, description);
+        expect.fail();
+      } catch (err) {
+        expect(err.message).to.equal(errorMsg);
+      } finally {
+        // restore
+        stub.restore();
+      }
+    });
+  });
+});