mP1/walkingkooka#2773 SortedSets & ImmutableSortedSet

- mP1/walkingkooka#2773
- SortedSets & ImmutableSortedSet

src/test/java/walkingkooka/tree/expression/function/datetime/DateTimeExpressionFunctionsTest.java

@@ -18,7 +18,7 @@
 package walkingkooka.tree.expression.function.datetime;
 
 import org.junit.jupiter.api.Test;
-import walkingkooka.collect.set.Sets;
+import walkingkooka.collect.set.SortedSets;
 import walkingkooka.reflect.JavaVisibility;
 import walkingkooka.reflect.PublicStaticHelperTesting;
 import walkingkooka.text.CaseSensitivity;
@@ -48,12 +48,12 @@ public void testExpressionFunctionProvider() {
                                             return n;
                                     }
                                 }
-                        ).collect(Collectors.toCollection(Sets::sorted)),
+                        ).collect(Collectors.toCollection(SortedSets::tree)),
                 DateTimeExpressionFunctions.expressionFunctionProvider(CaseSensitivity.SENSITIVE)
                         .expressionFunctionInfos()
                         .stream()
                         .map(i -> i.name().value())
-                        .collect(Collectors.toCollection(Sets::sorted))
+                        .collect(Collectors.toCollection(SortedSets::tree))
         );
     }