Add spec covering 'committer_hash'

CHANGELOG

@@ -28,6 +28,7 @@ v 8.12.0 (unreleased)
   - Instructions for enabling Git packfile bitmaps !6104
   - Use Search::GlobalService.new in the `GET /projects/search/:query` endpoint
   - Fix long comments in diffs messing with table width
+  - Add spec covering 'Gitlab::Git::committer_hash' !6433 (dandunckelman)
   - Fix pagination on user snippets page
   - Run CI builds with the permissions of users !5735
   - Fix sorting of issues in API

app/models/repository.rb

@@ -840,7 +840,7 @@ class Repository
   def get_committer_and_author(user, email: nil, name: nil)
     committer = user_to_committer(user)
-    author = name && email ? Gitlab::Git::committer_hash(email: email, name: name) : committer
+    author = Gitlab::Git::committer_hash(email: email, name: name) || committer
     {
       author: author,

lib/gitlab/git.rb

@@ -19,6 +19,8 @@ module Gitlab
       end
       def committer_hash(email:, name:)
+        return if email.nil? || name.nil?
+
         {
           email: email,
           name: name,

spec/lib/gitlab/git_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Git, lib: true do
+  let(:committer_email) { FFaker::Internet.email }
+
+  # I have to remove periods from the end of the name
+  # This happened when the user's name had a suffix (i.e. "Sr.")
+  # This seems to be what git does under the hood. For example, this commit:
+  #
+  # $ git commit --author='Foo Sr. <foo@example.com>' -m 'Where's my trailing period?'
+  #
+  # results in this:
+  #
+  # $ git show --pretty
+  # ...
+  # Author: Foo Sr <foo@example.com>
+  # ...
+  let(:committer_name) { FFaker::Name.name.chomp("\.") }
+
+  describe 'committer_hash' do
+    it "returns a hash containing the given email and name" do
+      committer_hash = Gitlab::Git::committer_hash(email: committer_email, name: committer_name)
+
+      expect(committer_hash[:email]).to eq(committer_email)
+      expect(committer_hash[:name]).to eq(committer_name)
+      expect(committer_hash[:time]).to be_a(Time)
+    end
+
+    context 'when email is nil' do
+      it "returns nil" do
+        committer_hash = Gitlab::Git::committer_hash(email: nil, name: committer_name)
+
+        expect(committer_hash).to be_nil
+      end
+    end
+
+    context 'when name is nil' do
+      it "returns nil" do
+        committer_hash = Gitlab::Git::committer_hash(email: committer_email, name: nil)
+
+        expect(committer_hash).to be_nil
+      end
+    end
+  end
+end