@Test
public void testGetGerritUrlJsonNoUrl() {
JSONObject change = new JSONObject();
change.put("number", "100");
PowerMockito.mockStatic(PluginImpl.class);
PluginImpl plugin = mock(PluginImpl.class);
GerritServer server = mock(GerritServer.class);
when(plugin.getServer(any(String.class))).thenReturn(server);
when(server.getConfig()).thenReturn(Setup.createConfig());
PowerMockito.when(PluginImpl.getInstance()).thenReturn(plugin);
ManualTriggerAction action = new ManualTriggerAction();
String url = action.getGerritUrl(change, null);