Implement Result.equals() and hashcode()

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

@@ -24,6 +24,7 @@ package net.kemitix.mon.result;
 import lombok.RequiredArgsConstructor;
 import net.kemitix.mon.maybe.Maybe;
 
+import java.util.Objects;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Predicate;
@@ -73,6 +74,16 @@ class Err<T> implements Result<T> {
         throw error;
     }
 
+    @Override
+    public boolean equals(Object other) {
+        return other instanceof Err && Objects.equals(error, ((Err) other).error);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(error);
+    }
+
     @Override
     public String toString() {
         return String.format("Result.Error{error=%s}", error);

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

@@ -8,6 +8,16 @@ import org.junit.Test;
 
 public class ResultTest implements WithAssertions {
 
+    @Test
+    public void equality() {
+        assertThat(Result.ok(1)).isEqualTo(Result.ok(1));
+        assertThat(Result.ok(1)).isNotEqualTo(Result.ok(2));
+        final RuntimeException runtimeException = new RuntimeException();
+        assertThat(Result.ok(1)).isNotEqualTo(Result.error(runtimeException));
+        assertThat(Result.error(runtimeException)).isEqualTo(Result.error(runtimeException));
+        assertThat(Result.ok(1).equals("1")).isFalse();
+    }
+
     @Test
     public void createSuccess_isSuccess() {
         //when