Add missing class

src/main/java/org/testng/internal/ant/AntReporterConfig.java

@@ -0,0 +1,51 @@
+package org.testng.internal.ant;
+
+import org.testng.collections.Lists;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Used with the <reporter> sub-element of the Ant task
+ *
+ * <p>NOTE: this class needs to be public. It's used by TestNG Ant task
+ */
+public class AntReporterConfig {
+
+  /** The class name of the reporter listener */
+  protected String className;
+
+  /** The properties of the reporter listener */
+  private final List<Property> properties = Lists.newArrayList();
+
+  public void addProperty(Property property) {
+    properties.add(property);
+  }
+
+  public void setClassName(String className) {
+    this.className = className;
+  }
+
+  public String serialize() {
+    List<org.testng.internal.ReporterConfig.Property> properties =
+        this.properties.stream()
+            .map(
+                property ->
+                    new org.testng.internal.ReporterConfig.Property(property.name, property.value))
+            .collect(Collectors.toList());
+    return (new org.testng.internal.ReporterConfig(className, properties)).serialize();
+  }
+
+  public static class Property {
+    private String name;
+    private String value;
+
+    public void setName(String name) {
+      this.name = name;
+    }
+
+    public void setValue(String value) {
+      this.value = value;
+    }
+  }
+}