test: confirm we can still add the plugin to projects w/o java/war

src/test/groovy/edu/wisc/doit/gradle/ContinuousPublishPluginTest.groovy

@@ -22,4 +22,12 @@ class ContinuousPublishPluginTest {
     assertTrue(project.tasks.confirmProjectVersionIncremented instanceof ConfirmProjectVersionIncrementedTask)
   }
 
+  @Test
+  public void plugin_still_initializes_if_neither_java_or_war_plugin_present() {
+    Project project = ProjectBuilder.builder().build()
+    project.pluginManager.apply 'edu.wisc.doit.gradle.continuous-publish-plugin'
+
+    assertTrue(project.tasks.confirmProjectVersionIncremented instanceof ConfirmProjectVersionIncrementedTask)
+  }
+
 }