logger.warn("Failed to delete {}.", tempFile.getAbsolutePath());
                        }
                    }
                }).start();
                saveInfo(messages -> messages.addSuccessInstallPlugin(GLOBAL, form.jarFile.getFileName()));
            } else {
                final Artifact artifact = getArtifactFromInstallForm(form);
                if (artifact == null) {

    }

    @Test
    public void test_addSuccessInstallPlugin() {
        String property = "testProperty";
        String arg0 = "plugin-name";
        FessMessages result = messages.addSuccessInstallPlugin(property, arg0);
        assertNotNull(result);
        assertSame(messages, result);
        assertTrue(messages.hasMessageOf(property));
    }

    @Test