Improve NextLabelCause Test Coverage (#370)

* NextLabelCauseTest-added

Signed-off-by: shinigami-777 <[email protected]>

* Use equalsverifier with NextLabelCause

Provides a deeper test of the equals contract and the hashCode
contract.

* moved-contents-of-setup

Signed-off-by: shinigami-777 <[email protected]>

* removed-comment

* comment-reverted-back

* Remove inaccurate comment

---------

Signed-off-by: shinigami-777 <[email protected]>
Co-authored-by: Mark Waite <[email protected]>

src/test/java/org/jvnet/jenkins/plugins/nodelabelparameter/NextLabelCauseTest.java

@@ -0,0 +1,34 @@
+package org.jvnet.jenkins.plugins.nodelabelparameter;
+
+import hudson.model.FreeStyleBuild;
+import hudson.model.FreeStyleProject;
+import nl.jqno.equalsverifier.EqualsVerifier;
+import nl.jqno.equalsverifier.Warning;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.JenkinsRule;
+
+public class NextLabelCauseTest {
+
+    @Rule
+    public JenkinsRule j = new JenkinsRule();
+
+    @Test
+    public void testGetShortDescription() throws Exception {
+        FreeStyleProject project = j.createFreeStyleProject("projectB");
+        FreeStyleBuild build = j.buildAndAssertSuccess(project);
+        NextLabelCause cause = new NextLabelCause("dummylabel", build);
+        String description = cause.getShortDescription();
+        Assert.assertEquals(description, "A build with label/node [dummylabel] was requested");
+    }
+
+    @Test
+    public void testEqualsContract() {
+        EqualsVerifier.forClass(LabelParameterValue.class)
+                .usingGetClass()
+                .suppress(Warning.NONFINAL_FIELDS)
+                .withIgnoredFields("description", "nextLabels")
+                .verify();
+    }
+}