Add test sources to checkstyle:check

Author: aherbert

checkstyle-suppressions.xml

@@ -24,4 +24,11 @@ limitations under the License.
 <suppressions>
     <suppress checks="Header" files="LICENSE.txt"/>
     <suppress checks="Header" files="NOTICE.txt"/>
+    <!-- Be more lenient on tests. -->
+    <suppress checks="Javadoc" files=".*[/\\]test[/\\].*" />
+    <suppress checks="MultipleStringLiterals" files=".*[/\\]test[/\\].*" />
+    <suppress checks="DesignForExtension" files=".*[/\\]test[/\\].*" />
+    <suppress checks="LineLength" files=".*[/\\]test[/\\].*" />
+    <suppress checks="IllegalCatch" files=".*[/\\]test[/\\].*" />
+    <suppress checks="MethodLength" files="(MersenneTwister64|Well44497[ab]|MultiplyWithCarry256)Test" />
 </suppressions>

pom.xml

@@ -332,6 +332,7 @@ limitations under the License.
           <configLocation>${basedir}/checkstyle.xml</configLocation>
           <enableRulesSummary>false</enableRulesSummary>
           <headerFile>${basedir}/LICENSE-header.txt</headerFile>
+          <includeTestSourceDirectory>true</includeTestSourceDirectory>
           <resourceExcludes>NOTICE.txt,LICENSE.txt,**/pom.properties,**/sha512.properties</resourceExcludes>
         </configuration>
       </plugin>
@@ -367,6 +368,7 @@ limitations under the License.
           <configLocation>${basedir}/checkstyle.xml</configLocation>
           <enableRulesSummary>false</enableRulesSummary>
           <headerFile>${basedir}/LICENSE-header.txt</headerFile>
+          <includeTestSourceDirectory>true</includeTestSourceDirectory>
         </configuration>
         <!-- We need to specify reportSets because 2.9.1 creates two reports -->
         <reportSets>