Added a test case

Author: kohsuke

src/test/java/io/jenkins/plugins/launchable/PropBuilderTest.java

@@ -0,0 +1,46 @@
+package io.jenkins.plugins.launchable;
+
+import com.cloudbees.hudson.plugins.folder.Folder;
+import hudson.model.FreeStyleBuild;
+import hudson.model.FreeStyleProject;
+import net.sf.json.JSONObject;
+import org.hamcrest.MatcherAssert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.JenkinsRule;
+
+import java.io.IOException;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
+public class PropBuilderTest {
+    @Rule
+    public JenkinsRule j = new JenkinsRule();
+
+    @Test
+    public void basics() throws Exception {
+        Folder folder1 = j.jenkins.createProject(Folder.class,"foo");
+        FreeStyleProject project = folder1.createProject(FreeStyleProject.class,"bar");
+        FreeStyleBuild build = project.scheduleBuild2(0).get();
+
+        JSONObject props = new PropsBuilder<>(build).build();
+        MatcherAssert.assertThat(props, is(new JSONObject()
+            .accumulate("job", new JSONObject()
+                .accumulate("fullName", "foo/bar")
+                .accumulate("type", FreeStyleProject.class.getName())
+                .accumulate("components", new JSONObject[] {
+                    new JSONObject()
+                        .accumulate("name", "foo")
+                        .accumulate("type", Folder.class.getName()),
+                    new JSONObject()
+                        .accumulate("name", "bar")
+                        .accumulate("type", FreeStyleProject.class.getName())
+                }))
+            .accumulate("build", new JSONObject()
+                .accumulate("number", 1)
+                .accumulate("displayName", "#1")
+            )
+        ));
+    }
+}