Add AntRun target to run html5lib-tests suite

This change adds an AntRun target which executes during the Maven “test”
phase and calls TreeTester and TokenizerTester to run all test cases in
the html5lib-tests suite.

Author: sideshowbarker

pom.xml

@@ -104,6 +104,45 @@
               </target>
             </configuration>
           </execution>
+          <execution>
+            <id>test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>run</goal>
+            </goals>
+            <configuration>
+              <target>
+                <property name="test_classpath" refid="maven.test.classpath"/>
+                <property name="failonerror" value="true"/>
+                <!-- We use fork="true" here because without it, when we run -->
+                <!-- Maven in GitHub Actions, we get an “Unable to find a -->
+                <!-- javac compiler” error — because Ant looks for javac in -->
+                <!-- the jre/ subdirectory of the JDK directory. -->
+                <javac srcdir="${project.build.testSourceDirectory}" destdir="${project.build.testOutputDirectory}" fork="true" includeantruntime="false">
+                  <classpath>
+                    <pathelement location="${project.build.outputDirectory}"/>
+                  </classpath>
+                </javac>
+                <!-- We use fork="true" here because without it, we otherwise get -->
+                <!-- java.lang.NoClassDefFoundError: jdk/internal/reflect/ConstructorAccessorImpl -->
+                <java classname="nu.validator.htmlparser.test.TokenizerTester" fork="true" failonerror="${failonerror}">
+                  <classpath>
+                    <pathelement path="${test_classpath}"/>
+                    <pathelement location="${project.build.outputDirectory}"/>
+                    <pathelement location="${project.build.testOutputDirectory}"/>
+                  </classpath>
+                  <arg value="${basedir}/html5lib-tests/tokenizer"/>
+                </java>
+                <java classname="nu.validator.htmlparser.test.TreeTester" fork="true" failonerror="${failonerror}">
+                  <classpath>
+                    <pathelement location="${project.build.outputDirectory}"/>
+                    <pathelement location="${project.build.testOutputDirectory}"/>
+                  </classpath>
+                  <arg value="${basedir}/html5lib-tests/tree-construction"/>
+                </java>
+              </target>
+            </configuration>
+          </execution>
           <execution>
             <id>tokenizer-hotspot-workaround</id>
             <phase>process-sources</phase>
@@ -115,7 +154,11 @@
                 <property name="translator.sources" value="${basedir}/translator-src"/>
                 <property name="translator.classes" value="${project.build.directory}/translator-classes"/>
                 <mkdir dir="${translator.classes}"/>
-                <javac srcdir="${translator.sources}" includes="nu/validator/htmlparser/generator/ApplyHotSpotWorkaround.java" destdir="${translator.classes}" includeantruntime="false"/>
+                <!-- We use fork="true" here because without it, when we run -->
+                <!-- Maven in GitHub Actions, we get an “Unable to find a -->
+                <!-- javac compiler” error — because Ant looks for javac in -->
+                <!-- the jre/ subdirectory of the JDK directory. -->
+                <javac srcdir="${translator.sources}" includes="nu/validator/htmlparser/generator/ApplyHotSpotWorkaround.java" fork="true" destdir="${translator.classes}" includeantruntime="false"/>
                 <java classname="nu.validator.htmlparser.generator.ApplyHotSpotWorkaround">
                   <classpath>
                     <pathelement location="${translator.classes}"/>