diff --git a/src/test/java/net/kemitix/mon/IdentityTest.java b/src/test/java/net/kemitix/mon/IdentityTest.java
index 5a1b3f3..513a979 100644
--- a/src/test/java/net/kemitix/mon/IdentityTest.java
+++ b/src/test/java/net/kemitix/mon/IdentityTest.java
@@ -10,6 +10,15 @@ import org.junit.Test;
  */
 public class IdentityTest implements WithAssertions {
 
+    @Test
+    public void functorLawMapIdEqualsId() {
+        //given
+        final String id = "id";
+        //when
+
+        //then
+    }
+
     @Test
     public void canMapIdentityFromStringToInteger() {
         //given
@@ -20,6 +29,10 @@ public class IdentityTest implements WithAssertions {
         assertIdentityContains(idInt, 3);
     }
 
+    private <T> void assertIdentityContains(final Identity<T> identity, final T expected) {
+        identity.map(id -> assertThat(id).isEqualTo(expected));
+    }
+
     @Test
     public void canFluentlyComposeFunctions() {
         //given
@@ -34,8 +47,4 @@ public class IdentityTest implements WithAssertions {
         assertIdentityContains(idBytes, "par".getBytes());
     }
 
-    private <T> void assertIdentityContains(final Identity<T> identity, final T expected) {
-        identity.map(id -> assertThat(id).isEqualTo(expected));
-    }
-
 }