Fixed AreIn constructor

core/src/main/java/uk/gov/gchq/koryphe/impl/predicate/AreIn.java

@@ -52,6 +52,10 @@ public AreIn() {
         // Required for serialisation
     }
 
+    public AreIn(final Collection<?> allowedValues) {
+        this.allowedValues = allowedValues;
+    }
+
     public AreIn(final Collection<?> allowedValues, final boolean nullOrEmptyAllowedValuesAccepted) {
         this.allowedValues = allowedValues;
         this.nullOrEmptyAllowedValuesAccepted = nullOrEmptyAllowedValuesAccepted;

core/src/test/java/uk/gov/gchq/koryphe/impl/predicate/AreInTest.java

@@ -167,6 +167,15 @@ public void shouldRejectWhenNotAllValuesPresentInSet() {
         assertThat(filter).rejects(set);
     }
 
+    @Test
+    public void shouldAllowSingleCollection() {
+        // Given
+        final AreIn filter = new AreIn(list);
+
+        // When / Then
+        assertThat(filter).accepts(list);
+    }
+
     @Test
     public void shouldJsonSerialiseAndDeserialise() throws IOException {
         // Given