init and add some tests for the systemd launcher

test/job/adapters/systemd_launcher_test.rb

@@ -0,0 +1,51 @@
+require 'test_helper'
+require 'ood_core/job/adapters/systemd'
+require 'ood_core/job/adapters/systemd/launcher'
+
+class SystemdLauncherTest < Minitest::Test
+  include TestHelper
+
+  def launcher_instance(config = {})
+    default = { ssh_hosts: ['foo'], submit_host: 'localhost' }
+    OodCore::Job::Adapters::LinuxSystemd::Launcher.new(**default.merge(config))
+  end
+
+  def setup
+    Etc.stubs(:getlogin).returns('testuser')
+  end
+
+  def test_instantiation
+    launcher = launcher_instance
+
+    refute_nil(launcher)
+  end
+
+  def test_ssh_cmd_default
+    launcher = launcher_instance
+    expected = [  'ssh', '-t', '-p', '22', '-o', 
+                  'Batchmode=yes', '-o', 'StrictHostKeyChecking=no', '-o', 'UserKnownHostsFile=/dev/null', 
+                  'testuser@localhost', '/bin/bash'
+                ]
+
+    assert_equal(expected, launcher.send(:ssh_cmd, 'localhost', ['/bin/bash']))
+  end
+
+  def test_ssh_cmd_with_host_checking
+    launcher = launcher_instance({ strict_host_checking: true })
+    expected = [  'ssh', '-t', '-p', '22', '-o', 
+                  'Batchmode=yes', 'testuser@localhost', '/bin/bash'
+                ]
+
+    assert_equal(expected, launcher.send(:ssh_cmd, 'localhost', ['/bin/bash']))
+  end
+
+  def test_ssh_cmd_with_keyfile
+    launcher = launcher_instance({ ssh_keyfile: "~/.ssh/my_key" })
+    expected = [  'ssh', '-t', '-p', '22', '-o', 
+                  'Batchmode=yes', '-o', 'StrictHostKeyChecking=no', '-o', 'UserKnownHostsFile=/dev/null', 
+                  '-i', '~/.ssh/my_key', 'testuser@localhost', '/bin/bash'
+                ]
+
+    assert_equal(expected, launcher.send(:ssh_cmd, 'localhost', ['/bin/bash']))
+  end
+end