Index: trunk/test/unit/org/openstreetmap/josm/testutils/PluginServer.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/PluginServer.java	(revision 18972)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/PluginServer.java	(revision 18974)
@@ -25,5 +25,11 @@
 import org.openstreetmap.josm.tools.Logging;
 
+/**
+ * Serve "remote" test plugins for tests
+ */
 public class PluginServer {
+    /**
+     * A holder class for a "remote" plugin for tests
+     */
     public static class RemotePlugin {
         private final File srcJar;
@@ -226,4 +232,7 @@
     }
 
+    /**
+     * A wiremock server rule for serving plugins
+     */
     public class PluginServerRule extends WireMockExtension {
         public PluginServerRule(Options ruleOptions, boolean failOnUnmatchedRequests) {
Index: trunk/test/unit/org/openstreetmap/josm/testutils/annotations/ResetUniquePrimitiveIdCounters.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/annotations/ResetUniquePrimitiveIdCounters.java	(revision 18972)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/annotations/ResetUniquePrimitiveIdCounters.java	(revision 18974)
@@ -37,4 +37,8 @@
 @ExtendWith(ResetUniquePrimitiveIdCounters.Reset.class)
 public @interface ResetUniquePrimitiveIdCounters {
+    /**
+     * Reset the id counters for {@link Node}, {@link Way}, and {@link Relation}
+     * {@link org.openstreetmap.josm.data.osm.AbstractPrimitive#getIdGenerator} calls.
+     */
     class Reset implements BeforeEachCallback {
         private static AtomicLong[] ID_COUNTERS;
Index: trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TaggingPresets.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TaggingPresets.java	(revision 18972)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TaggingPresets.java	(revision 18974)
@@ -32,4 +32,7 @@
 public @interface TaggingPresets {
 
+    /**
+     * Reset the tagging presets between each test -- presets will be reset if they are changed.
+     */
     class TaggingPresetsExtension implements BeforeEachCallback, BeforeAllCallback {
         private static int expectedHashcode = 0;
Index: trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TestUser.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TestUser.java	(revision 18972)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/annotations/TestUser.java	(revision 18974)
@@ -33,4 +33,7 @@
 @Target({ElementType.TYPE, ElementType.METHOD})
 public @interface TestUser {
+    /**
+     * Initialize a user for tests
+     */
     class TestUserExtension implements BeforeAllCallback, BeforeEachCallback, AfterEachCallback {
         @Override
Index: trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Timezone.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Timezone.java	(revision 18972)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Timezone.java	(revision 18974)
@@ -21,4 +21,7 @@
 @ExtendWith(Timezone.TimezoneExtension.class)
 public @interface Timezone {
+    /**
+     * Set the default timezone for tests (UTC)
+     */
     class TimezoneExtension implements BeforeEachCallback {
         @Override