Added spotless apply and removed LinkedHashSets for better readability

core/src/test/java/uk/gov/gchq/koryphe/impl/function/StringJoinTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020 Crown Copyright
+ * Copyright 2020-2023 Crown Copyright
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,6 @@
 
 import java.io.IOException;
 import java.util.Collections;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -49,7 +48,7 @@ public void shouldHandleNullInput() {
     public void shouldHandleNullDelimiter() {
         // Given
         final StringJoin<String> function = new StringJoin<>(null);
-        final Set<String> input = new LinkedHashSet<>(Lists.newArrayList("a", "b", "c"));
+        final List<String> input = new Lists.newArrayList("a", "b", "c");
 
         // When
         final String result = function.apply(input);
@@ -62,7 +61,7 @@ public void shouldHandleNullDelimiter() {
     public void shouldJoinIterableOfStrings() {
         // Given
         final StringJoin<String> function = new StringJoin<>();
-        final Set<String> input = new LinkedHashSet<>(Lists.newArrayList("a", "b", "c"));
+        final List<String> input = new Lists.newArrayList("a", "b", "c");
 
         // When
         final String result = function.apply(input);
@@ -88,7 +87,7 @@ public void shouldJoinIterableOfIntegers() {
     public void shouldJoinIterableOfStringsWithDelimiter() {
         // Given
         final StringJoin<String> function = new StringJoin<>(",");
-        final Set<String> input = new LinkedHashSet<>(Lists.newArrayList("a", "b", "c"));
+        final List<String> input = new Lists.newArrayList("a", "b", "c");
 
         // When
         final String result = function.apply(input);