Cleanup tests, remove useless arguments

The default argument, HEAD, is better than master, as it's a symbolic
reference.

lib/gitlab/git/repository.rb

@@ -18,7 +18,6 @@ module Gitlab
       GITALY_INTERNAL_URL = 'ssh://gitaly/internal.git'
       GITLAB_PROJECTS_TIMEOUT = Gitlab.config.gitlab_shell.git_timeout
       EMPTY_REPOSITORY_CHECKSUM = '0000000000000000000000000000000000000000'
-      REF_REMOVAL_UPDATE_REV = '0' * 40
 
       NoRepository = Class.new(StandardError)
       InvalidRepository = Class.new(StandardError)
@@ -639,7 +638,7 @@ module Gitlab
       # Delete the specified branch from the repository
       # Note: No Git hooks are executed for this action
       def delete_branch(branch_name)
-        write_ref(branch_name, REF_REMOVAL_UPDATE_REV)
+        write_ref(branch_name, Gitlab::Git::BLANK_SHA)
       rescue CommandError => e
         raise DeleteBranchError, e
       end

lib/gitlab/gitaly_client/ref_service.rb

@@ -151,40 +151,6 @@ module Gitlab
         Gitlab::Git::Branch.new(@repository, encode!(branch.name.dup), branch.target_commit.id, target_commit)
       end
 
-      def create_branch(ref, start_point)
-        request = Gitaly::CreateBranchRequest.new(
-          repository: @gitaly_repo,
-          name: encode_binary(ref),
-          start_point: encode_binary(start_point)
-        )
-
-        response = GitalyClient.call(@repository.storage, :ref_service, :create_branch, request, timeout: GitalyClient.medium_timeout)
-
-        case response.status
-        when :OK
-          branch = response.branch
-          target_commit = Gitlab::Git::Commit.decorate(@repository, branch.target_commit)
-          Gitlab::Git::Branch.new(@repository, branch.name, branch.target_commit.id, target_commit)
-        when :ERR_INVALID
-          invalid_ref!("Invalid ref name")
-        when :ERR_EXISTS
-          invalid_ref!("Branch #{ref} already exists")
-        when :ERR_INVALID_START_POINT
-          invalid_ref!("Invalid reference #{start_point}")
-        else
-          raise "Unknown response status: #{response.status}"
-        end
-      end
-
-      def delete_branch(branch_name)
-        request = Gitaly::DeleteBranchRequest.new(
-          repository: @gitaly_repo,
-          name: encode_binary(branch_name)
-        )
-
-        GitalyClient.call(@repository.storage, :ref_service, :delete_branch, request, timeout: GitalyClient.medium_timeout)
-      end
-
       def delete_refs(refs: [], except_with_prefixes: [])
         request = Gitaly::DeleteRefsRequest.new(
           repository: @gitaly_repo,

lib/gitlab/import_export/merge_request_parser.rb

@@ -48,14 +48,6 @@ module Gitlab
         @project.repository.create_branch(@merge_request.target_branch, @merge_request.target_branch_sha)
       end
 
-      def fetch_ref
-        target_ref = Gitlab::Git::BRANCH_REF_PREFIX + @merge_request.source_branch
-
-        unless @project.repository.fetch_source_branch!(@project.repository, @diff_head_sha, target_ref)
-          Rails.logger.warn("Import/Export warning: Failed to create #{target_ref} for MR: #{@merge_request.iid}") # rubocop:disable Gitlab/RailsLogger
-        end
-      end
-
       def branch_exists?(branch_name)
         @project.repository.raw.branch_exists?(branch_name)
       end

spec/features/issues/user_creates_branch_and_merge_request_spec.rb

@@ -187,7 +187,7 @@ describe 'User creates branch and merge request on issue page', :js do
       let(:branch_name) { "#{issue.iid}-foo" }
 
       before do
-        project.repository.create_branch(branch_name, 'master')
+        project.repository.create_branch(branch_name)
 
         visit project_issue_path(project, issue)
       end

spec/features/merge_request/user_resolves_conflicts_spec.rb

@@ -169,8 +169,8 @@ describe 'Merge request > User resolves conflicts', :js do
 
     context "with malicious branch name" do
       let(:bad_branch_name) { "malicious-branch-{{toString.constructor('alert(/xss/)')()}}" }
-      let(:branch) { project.repository.create_branch(bad_branch_name, 'conflict-resolvable') }
-      let(:merge_request) { create_merge_request(branch.name) }
+      let!(:branch) { project.repository.create_branch(bad_branch_name, 'conflict-resolvable') }
+      let(:merge_request) { create_merge_request(bad_branch_name) }
 
       before do
         visit project_merge_request_path(project, merge_request)

spec/features/projects/graph_spec.rb

@@ -60,7 +60,7 @@ describe 'Project Graph', :js do
     let(:branch_name) { '<h1>evil</h1>' }
 
     before do
-      project.repository.create_branch(branch_name, 'master')
+      project.repository.create_branch(branch_name)
 
       visit charts_project_graph_path(project, branch_name)
     end

spec/lib/gitlab/git/repository_spec.rb

@@ -310,8 +310,8 @@ describe Gitlab::Git::Repository, :seed_helper do
 
       with_them do
         before do
-          repository.create_branch('left-branch', 'master')
-          repository.create_branch('right-branch', 'master')
+          repository.create_branch('left-branch')
+          repository.create_branch('right-branch')
 
           left.times do
             new_commit_edit_new_file_on_branch(repository_rugged, 'encoding/CHANGELOG', 'left-branch', 'some more content for a', 'some stuff')
@@ -350,8 +350,8 @@ describe Gitlab::Git::Repository, :seed_helper do
 
       with_them do
         before do
-          repository.create_branch('left-branch', 'master')
-          repository.create_branch('right-branch', 'master')
+          repository.create_branch('left-branch')
+          repository.create_branch('right-branch')
 
           left.times do
             new_commit_edit_new_file_on_branch(repository_rugged, 'encoding/CHANGELOG', 'left-branch', 'some more content for a', 'some stuff')
@@ -457,8 +457,8 @@ describe Gitlab::Git::Repository, :seed_helper do
     let(:utf8_branch) { 'branch-é' }
 
     before do
-      repository.create_branch(new_branch, 'master')
-      repository.create_branch(utf8_branch, 'master')
+      repository.create_branch(new_branch)
+      repository.create_branch(utf8_branch)
     end
 
     after do
@@ -560,32 +560,30 @@ describe Gitlab::Git::Repository, :seed_helper do
   describe '#search_files_by_content' do
     let(:repository) { mutable_repository }
     let(:repository_rugged) { mutable_repository_rugged }
+    let(:ref) { 'search-files-by-content-branch' }
+    let(:content) { 'foobarbazmepmep' }
 
     before do
-      repository.create_branch('search-files-by-content-branch', 'master')
-      new_commit_edit_new_file_on_branch(repository_rugged, 'encoding/CHANGELOG', 'search-files-by-content-branch', 'committing something', 'search-files-by-content change')
-      new_commit_edit_new_file_on_branch(repository_rugged, 'anotherfile', 'search-files-by-content-branch', 'committing something', 'search-files-by-content change')
+      repository.create_branch(ref)
+      new_commit_edit_new_file_on_branch(repository_rugged, 'encoding/CHANGELOG', ref, 'committing something', content)
+      new_commit_edit_new_file_on_branch(repository_rugged, 'anotherfile', ref, 'committing something', content)
     end
 
     after do
       ensure_seeds
     end
 
-    shared_examples 'search files by content' do
-      it 'has 2 items' do
-        expect(search_results.size).to eq(2)
+    subject do
+      repository.search_files_by_content(content, ref)
     end
 
-      it 'has the correct matching line' do
-        expect(search_results).to contain_exactly("search-files-by-content-branch:encoding/CHANGELOG\u00001\u0000search-files-by-content change\n",
-                                                  "search-files-by-content-branch:anotherfile\u00001\u0000search-files-by-content change\n")
-      end
+    it 'has 2 items' do
+      expect(subject.size).to eq(2)
     end
 
-    it_should_behave_like 'search files by content' do
-      let(:search_results) do
-        repository.search_files_by_content('search-files-by-content', 'search-files-by-content-branch')
-      end
+    it 'has the correct matching line' do
+      expect(subject).to contain_exactly("#{ref}:encoding/CHANGELOG\u00001\u0000#{content}\n",
+                                         "#{ref}:anotherfile\u00001\u0000#{content}\n")
     end
   end
 
@@ -1067,7 +1065,7 @@ describe Gitlab::Git::Repository, :seed_helper do
 
       before do
         create_remote_branch('joe', 'remote_branch', 'master')
-        repository.create_branch('local_branch', 'master')
+        repository.create_branch('local_branch')
       end
 
       after do
@@ -1093,7 +1091,7 @@ describe Gitlab::Git::Repository, :seed_helper do
 
       before do
         create_remote_branch('joe', 'remote_branch', 'master')
-        repository.create_branch('local_branch', 'master')
+        repository.create_branch('local_branch')
       end
 
       after do
@@ -1143,7 +1141,7 @@ describe Gitlab::Git::Repository, :seed_helper do
 
     context 'when no branch names are specified' do
       before do
-        repository.create_branch('identical', 'master')
+        repository.create_branch('identical')
       end
 
       after do
@@ -1254,7 +1252,7 @@ describe Gitlab::Git::Repository, :seed_helper do
       let(:branch_name) { "ʕ•ᴥ•ʔ" }
 
       before do
-        repository.create_branch(branch_name, "master")
+        repository.create_branch(branch_name)
       end
 
       after do
@@ -1398,7 +1396,7 @@ describe Gitlab::Git::Repository, :seed_helper do
 
     before do
       create_remote_branch('joe', 'remote_branch', 'master')
-      repository.create_branch('local_branch', 'master')
+      repository.create_branch('local_branch')
     end
 
     after do

spec/models/push_event_spec.rb

@@ -74,7 +74,7 @@ describe PushEvent do
       create(:push_event_payload, event: event4, ref: 'baz', action: :removed)
       create(:push_event_payload, event: event5, ref: 'baz', ref_type: :tag)
 
-      project.repository.create_branch('bar', 'master')
+      project.repository.create_branch('bar')
 
       create(
         :merge_request,
@@ -83,7 +83,7 @@ describe PushEvent do
         source_branch: 'bar'
       )
 
-      project.repository.create_branch('qux', 'master')
+      project.repository.create_branch('qux')
 
       create(
         :merge_request,