diff --git a/test/fake_jira.rb b/test/fake_jira.rb
new file mode 100644
index 0000000..c839b6c
--- /dev/null
+++ b/test/fake_jira.rb
@@ -0,0 +1,114 @@
+# Copyright (c) 2016-2022 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the 'Software'), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+class FakeJira
+  attr_reader :name, :repo
+
+  def initialize(options = {})
+    @name = 'JIRA'
+    @repositories = options[:repositories] || []
+    @repo = options[:repo]
+  end
+
+  def repositories(user = nil, _options = {})
+    @repositories unless user
+  end
+
+  def issue(_)
+    {
+      state: 'open',
+      author: {
+        id: '1',
+        username: 'yegor256'
+      },
+      milestone: {
+        number: 1,
+        title: 'v0.1'
+      }
+    }
+  end
+
+  def close_issue(_); end
+
+  def create_issue(_)
+    {
+      number: 1,
+      html_url: 'url'
+    }
+  end
+
+  def update_issue(_, _); end
+
+  def labels
+    [
+      {
+        id: ``,
+        name: 'Dev',
+        color: '#ff00ff'
+      }
+    ]
+  end
+
+  def add_label(_, _); end
+
+  def add_labels_to_an_issue(_, _); end
+
+  def add_comment(_, _); end
+
+  def create_commit_comment(_, _)
+    {
+      html_url: 'url'
+    }
+  end
+
+  def list_commits
+    [
+      {
+        sha: '123456',
+        html_url: 'url'
+      }
+    ]
+  end
+
+  def user(_)
+    {
+      name: 'yegor256',
+      email: 'yegor256@example.com'
+    }
+  end
+
+  def star; end
+
+  def repository(_ = nil)
+    {
+      private: false
+    }
+  rescue JIRA::Error::NotFound => e
+    raise "Repository #{name} is not available: #{e.message}"
+  end
+
+  private
+
+  def git_repo
+    # Output:
+    # repo -> GitRepo
+    raise NotImplementedError, 'You must implement this method'
+  end
+end
diff --git a/test/test_jira.rb b/test/test_jira.rb
new file mode 100644
index 0000000..6d3eca9
--- /dev/null
+++ b/test/test_jira.rb
@@ -0,0 +1,36 @@
+# Copyright (c) 2016-2022 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the 'Software'), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+require 'test/unit'
+require_relative 'test__helper'
+require_relative '../objects/clients/jira'
+
+# Jira test.
+# Author:: Yegor Bugayenko (yegor256@gmail.com)
+# Copyright:: Copyright (c) 2016-2022 Yegor Bugayenko
+# License:: MIT
+class TestGitlab < Test::Unit::TestCase
+  def test_configuration_right
+    jira = JiraClient.new.client
+    assert_raises JIRA::Error::MissingCredentials do
+      jira.user('0pdd')['username']
+    end
+  end
+end