Merge branch 'hvlad/gitlab-ce-feature/add_test_for_git_http_ldap_user' into 'master'

Added git http requests tests for user with LDAP identity

## What does this MR do?

Added tests to git http request for a user with ldap identity.

## Are there points in the code the reviewer needs to double check?

In order to stick to the way the existing tests are defined in spec files, I have added the new tests in the same spec file that coveres the git http request feature and thus it seems to be a lot of changes in the git_http_spec.rb when looking at the commit git in Gitlab, but the largest change is indentation so please check with a better diff tool (i.e. kdiff3).

Let me know if this is OK with you or do you want to have a new file introduced (i.e. `git_http_ldap_spec.rb`)

## Why was this MR needed?

To increase test coverage and to make sure  the changes that will be introduced by #20820 will not introduce any regressions.

## What are the relevant issue numbers?

#20820

See merge request !6559

spec/support/git_http_helpers.rb

+module GitHttpHelpers
+  def clone_get(project, options = {})
+    get "/#{project}/info/refs", { service: 'git-upload-pack' }, auth_env(*options.values_at(:user, :password, :spnego_request_token))
+  end
+
+  def clone_post(project, options = {})
+    post "/#{project}/git-upload-pack", {}, auth_env(*options.values_at(:user, :password, :spnego_request_token))
+  end
+
+  def push_get(project, options = {})
+    get "/#{project}/info/refs", { service: 'git-receive-pack' }, auth_env(*options.values_at(:user, :password, :spnego_request_token))
+  end
+
+  def push_post(project, options = {})
+    post "/#{project}/git-receive-pack", {}, auth_env(*options.values_at(:user, :password, :spnego_request_token))
+  end
+
+  def download(project, user: nil, password: nil, spnego_request_token: nil)
+    args = [project, { user: user, password: password, spnego_request_token: spnego_request_token }]
+
+    clone_get(*args)
+    yield response
+
+    clone_post(*args)
+    yield response
+  end
+
+  def upload(project, user: nil, password: nil, spnego_request_token: nil)
+    args = [project, { user: user, password: password, spnego_request_token: spnego_request_token }]
+
+    push_get(*args)
+    yield response
+
+    push_post(*args)
+    yield response
+  end
+
+  def auth_env(user, password, spnego_request_token)
+    env = workhorse_internal_api_request_header
+    if user && password
+      env['HTTP_AUTHORIZATION'] = ActionController::HttpAuthentication::Basic.encode_credentials(user, password)
+    elsif spnego_request_token
+      env['HTTP_AUTHORIZATION'] = "Negotiate #{::Base64.strict_encode64('opaque_request_token')}"
+    end
+
+    env
+  end
+end