#730: Added a checkstyle rule to check for missing package declarations.

Added a suppression to ignore the test sources.

checkstyle-suppressions.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<!DOCTYPE suppressions PUBLIC
+          "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
+          "https://checkstyle.org/dtds/suppressions_1_2.dtd">
+
+<suppressions>
+    <!-- Don't check for missing package declarations in tests-->
+    <suppress checks="JavadocPackage" files=".*[\\/]src[\\/]test[\\/].*\.java$"/>
+</suppressions>

checkstyle.xml

@@ -20,6 +20,9 @@
         <property name="message" value="Line has trailing spaces."/>
     </module>
 
+    <!-- See https://checkstyle.sourceforge.io/config_javadoc.html#JavadocPackage-->
+    <module name="JavadocPackage"/>
+
     <module name="TreeWalker">
         <!-- See https://checkstyle.org/config_javadoc.html -->
         <module name="AtclauseOrder"/>

pom.xml

@@ -217,6 +217,7 @@
                         </executions>
                         <configuration>
                             <configLocation>checkstyle.xml</configLocation>
+                            <suppressionsLocation>checkstyle-suppressions.xml</suppressionsLocation>
                             <includeTestSourceDirectory>true</includeTestSourceDirectory>
                         </configuration>
                         <dependencies>