Add Result.toString() implementations

src/main/java/net/kemitix/mon/result/Err.java

@@ -72,4 +72,9 @@ class Err<T> implements Result<T> {
     public T orElseThrow() throws Throwable {
         throw error;
     }
+
+    @Override
+    public String toString() {
+        return String.format("Result.Error{error=%s}", error);
+    }
 }

src/main/java/net/kemitix/mon/result/Success.java

@@ -75,4 +75,9 @@ class Success<T> implements Result<T> {
     public T orElseThrow() {
         return value;
     }
+
+    @Override
+    public String toString() {
+        return String.format("Result.Success{value=%s}", value);
+    }
 }

src/test/java/net/kemitix/mon/ResultTest.java

@@ -348,6 +348,26 @@ public class ResultTest implements WithAssertions {
         );
     }
 
+    @Test
+    public void success_toString() {
+        //given
+        final Result<Integer> ok = Result.ok(1);
+        //when
+        final String toString = ok.toString();
+        //then
+        assertThat(toString).contains("Result.Success{value=1}");
+    }
+
+    @Test
+    public void err_toString() {
+        //given
+        final Result<Integer> error = Result.error(new RuntimeException("failed"));
+        //when
+        final String toString = error.toString();
+        //then
+        assertThat(toString).contains("Result.Error{error=java.lang.RuntimeException: failed}");
+    }
+
     @RequiredArgsConstructor
     private static class UseCase {