Document @⁠EmptySource support for Iterable, Iterator, and ListIterator

Closes #5368

Author: sbrannen

documentation/modules/ROOT/pages/writing-tests/parameterized-classes-and-tests.adoc

@@ -249,11 +249,12 @@ for parameterized tests that accept a single argument.
    - `@NullSource` cannot be used for a parameter that has a primitive type.
 * `{EmptySource}`: provides a single _empty_ argument to the annotated
   `@ParameterizedClass` or `@ParameterizedTest` for parameters of the following types:
-  `java.lang.String`, `java.util.Collection` (and concrete subtypes with a `public` no-arg
-  constructor), `java.util.List`, `java.util.Set`, `java.util.SortedSet`,
-  `java.util.NavigableSet`, `java.util.Map` (and concrete subtypes with a `public` no-arg
-  constructor), `java.util.SortedMap`, `java.util.NavigableMap`, primitive arrays (e.g.,
-  `int[]`, `char[][]`, etc.), object arrays (e.g., `String[]`, `Integer[][]`, etc.).
+  `java.lang.String`, `java.lang.Iterable`, `java.util.Iterator`, `java.util.ListIterator`
+  `java.util.Collection` (and concrete subtypes with a `public` no-arg constructor),
+  `java.util.List`, `java.util.Set`, `java.util.SortedSet`, `java.util.NavigableSet`,
+  `java.util.Map` (and concrete subtypes with a `public` no-arg constructor),
+  `java.util.SortedMap`, `java.util.NavigableMap`, primitive arrays (for example, `int[]`,
+  `char[][]`, etc.), object arrays (for example, `String[]`, `Integer[][]`, etc.).
 * `{NullAndEmptySource}`: a _composed annotation_ that combines the functionality of
   `@NullSource` and `@EmptySource`.
 

junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/EmptySource.java

@@ -33,6 +33,9 @@
  *
  * <ul>
  * <li>{@link java.lang.String}</li>
+ * <li>{@link java.lang.Iterable}</li>
+ * <li>{@link java.util.Iterator}</li>
+ * <li>{@link java.util.ListIterator}</li>
  * <li>{@link java.util.Collection} and concrete subtypes with a public no-arg constructor</li>
  * <li>{@link java.util.List}</li>
  * <li>{@link java.util.Set}</li>