diff --git a/src/Tgstation.Server.Api/Models/Internal/RepositorySettings.cs b/src/Tgstation.Server.Api/Models/Internal/RepositorySettings.cs
index 11917d2f81..35a560f7da 100644
--- a/src/Tgstation.Server.Api/Models/Internal/RepositorySettings.cs
+++ b/src/Tgstation.Server.Api/Models/Internal/RepositorySettings.cs
@@ -41,6 +41,12 @@ namespace Tgstation.Server.Api.Models.Internal
 		[Permissions(WriteRight = RepositoryRights.ChangeTestMergeCommits)]
 		public bool PushTestMergeCommits { get; set; }
 
+		/// <summary>
+		/// If test merge commits are signed with the username of the person who merged it. Note this only affects future commits
+		/// </summary>
+		[Permissions(WriteRight = RepositoryRights.ChangeTestMergeCommits)]
+		public bool ShowTestMergeCommitters { get; set; }
+
 		/// <summary>
 		/// How often the <see cref="Repository"/> automatically updates in minutes
 		/// </summary>
diff --git a/src/Tgstation.Server.Api/Models/Repository.cs b/src/Tgstation.Server.Api/Models/Repository.cs
index 96ca42c58c..db3ed5b303 100644
--- a/src/Tgstation.Server.Api/Models/Repository.cs
+++ b/src/Tgstation.Server.Api/Models/Repository.cs
@@ -26,6 +26,12 @@ namespace Tgstation.Server.Api.Models
 		[Permissions(DenyWrite = true)]
 		public RevisionInformation RevisionInformation { get; set; }
 
+		/// <summary>
+		/// If the repository was cloned from GitHub.com. If <see langword="true"/> this enables test merge functionality
+		/// </summary>
+		[Permissions(DenyWrite = true)]
+		public bool IsGitHub { get; set; }
+
 		/// <summary>
 		/// The branch or tag HEAD points to
 		/// </summary>
diff --git a/src/Tgstation.Server.Api/Models/TestMergeParameters.cs b/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
index 2c3ba33f02..ed27e6bb08 100644
--- a/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
+++ b/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
@@ -17,5 +17,10 @@ namespace Tgstation.Server.Api.Models
 		/// </summary>
 		[Required]
 		public string PullRequestRevision { get; set; }
+
+		/// <summary>
+		/// Optional comment about the test
+		/// </summary>
+		public string Comment { get; set; }
 	}
 }
\ No newline at end of file
diff --git a/src/Tgstation.Server.Host/Components/IRepository.cs b/src/Tgstation.Server.Host/Components/IRepository.cs
new file mode 100644
index 0000000000..90dce08440
--- /dev/null
+++ b/src/Tgstation.Server.Host/Components/IRepository.cs
@@ -0,0 +1,98 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Tgstation.Server.Host.Components
+{
+	/// <summary>
+	/// Represents an on-disk git repository
+	/// </summary>
+	interface IRepository
+	{
+		/// <summary>
+		/// Check if the <see cref="IRepository"/> is in a working state
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in <see langword="true"/> if the <see cref="IRepository"/> is in a working state, <see langword="false"/> otherwise</returns>
+		Task<bool> Exists(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Check if the <see cref="IRepository"/> was cloned from GitHub.com
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in <see langword="true"/> if the <see cref="IRepository"/> was cloned from GitHub.com, <see langword="false"/> otherwise</returns>
+		Task<bool> IsGitHubRepository(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Get the SHA of the <see cref="IRepository"/> HEAD
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in the SHA of the <see cref="IRepository"/> HEAD</returns>
+		Task<string> GetHead(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Get the current reference the <see cref="IRepository"/> HEAD is using. This can be a branch or tag
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in the current reference the <see cref="IRepository"/> HEAD is using. Will be <see langword="null"/> if not on a branch or tag</returns>
+		Task<string> GetReference(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Get the current origin remote the <see cref="IRepository"/> is using
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in the current origin remote the <see cref="IRepository"/> is using</returns>
+		Task<string> GetOrigin(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Deletes the <see cref="IRepository"/> and clones a <paramref name="newOrigin"/> using an <paramref name="accessString"/> if provided
+		/// </summary>
+		/// <param name="newOrigin">The new remote url</param>
+		/// <param name="accessString">The access string to clone the repository</param>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task"/> representing the running operation</returns>
+		Task SetOrigin(string newOrigin, string accessString, CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Checks out a given <paramref name="committish"/>
+		/// </summary>
+		/// <param name="committish">The sha or reference to checkout</param>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task"/> representing the running operation</returns>
+		Task CheckoutObject(string committish, CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Attempt to merge a GitHub pull request into HEAD
+		/// </summary>
+		/// <param name="pullRequestNumber">The pull request number on the remote repository</param>
+		/// <param name="targetCommit">The commit in the pull request to merge</param>
+		/// <param name="committerName">The name of the merge committer</param>
+		/// <param name="committerEmail">The e-mail of the merge committer</param>
+		/// <param name="commitBody">The body of the commit message</param>
+		/// <param name="accessString">The access string to fetch from the origin repository</param>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in the SHA of the new HEAD on success, <see langword="null"/> on merge conflict</returns>
+		Task<string> AddTestMerge(int pullRequestNumber, string targetCommit, string committerName, string committerEmail, string commitBody, string accessToken, CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Fetch commits from the origin repository
+		/// </summary>
+		/// <param name="accessString">The access string to fetch from the origin repository</param>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task"/> representing the running operation</returns>
+		Task FetchOrigin(string accessString, CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Requires the current HEAD to be a tracked reference. Hard resets the reference to what it tracks on the origin repository
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task{TResult}"/> resulting in the SHA of the new HEAD</returns>
+		Task<string> ResetToOrigin(CancellationToken cancellationToken);
+
+		/// <summary>
+		/// Push the current repository HEAD to a temporary GitHub branch and then delete it
+		/// </summary>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation</param>
+		/// <returns>A <see cref="Task"/> representing the running operation</returns>
+		Task PushHeadToTemporaryBranch(CancellationToken cancellationToken);
+	}
+}