slack_mattermost_emoji/spec/mattermost_client_spec.rb

require "dotenv/load"
require "slack_mattermost_emoji/mattermost_client"

RSpec.describe SlackMattermostEmoji::MattermostClient do
  it 'should raise if credentials are missing' do
    expect do
       SlackMattermostEmoji::MattermostClient.new(
        username: '',
        password: '',
        domain: '',
      )
    end.to raise_error('Mattermost username, password, and domain are all required')
  end

  it 'should be able to log in to mattermost using the provided credentials' do
    client = SlackMattermostEmoji::MattermostClient.new(
      username: ENV['MATTERMOST_USERNAME'],
      password: ENV['MATTERMOST_PASSWORD'],
      domain: ENV['MATTERMOST_DOMAIN'],
    )
    client.authenticate

    expect(client.authenticated?).to be true
  end

  it 'should handle a bad credentials error' do
    client = SlackMattermostEmoji::MattermostClient.new(
      username: ENV['MATTERMOST_USERNAME'],
      password: 'wrongpassword',
      domain: ENV['MATTERMOST_DOMAIN'],
    )
    expect { client.authenticate }.to raise_error('Invalid Mattermost credentials')
  end
end