Fail the build when naming conventions violated (#3974)

* Failing build if unit test name does not follow one of the following conventions : ..IntegrationTest, ..LongRunningUnitTest, ..ManualTest, ..JdbcTest, ..LiveTest

* Custom PMD Rules project

* Fixed this issue when unit test classes were not being scanned by custom PMD rule (This happened after I pulled code from upstream project)

* Don't fail the build if PMD custom rule fails

* Reconfigure PMD

* Reformat POM

* Adjust PMD rules

* Rename test

custom-pmd/src/main/java/org/baeldung/pmd/UnitTestNamingConventionRule.java

@@ -0,0 +1,32 @@
+package org.baeldung.pmd;
+
+import net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceDeclaration;
+import net.sourceforge.pmd.lang.java.rule.AbstractJavaRule;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+public class UnitTestNamingConventionRule extends AbstractJavaRule {
+
+    private static List<String> allowedEndings = Arrays.asList(
+      "IntegrationTest",
+      "LongRunningUnitTest",
+      "ManualTest",
+      "JdbcTest",
+      "LiveTest");
+
+    public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
+        String className = node.getImage();
+        Objects.requireNonNull(className);
+
+        if (className.endsWith("Test") || className.endsWith("Tests")) {
+            if (allowedEndings.stream()
+              .noneMatch(className::endsWith)) {
+                addViolation(data, node);
+            }
+        }
+
+        return data;
+    }
+}