Fixed indentation in test class.
diff --git a/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/FactorialTest.java b/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/FactorialTest.java
index 17cad27..4dba998 100644
--- a/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/FactorialTest.java
+++ b/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/FactorialTest.java
@@ -38,14 +38,14 @@
     @Test
     public void testPrecondition1() {
         Assertions.assertThrows(IllegalArgumentException.class,
-                () -> Factorial.value(-1)
+            () -> Factorial.value(-1)
         );
     }
 
     @Test
     public void testPrecondition2() {
         Assertions.assertThrows(IllegalArgumentException.class,
-                () -> Factorial.value(21)
+            () -> Factorial.value(21)
         );
     }