Add satisfying fun

Author: Simon Frost

src/main/kotlin/in/rcard/assertj/arrowcore/AbstractEitherAssert.kt

@@ -10,6 +10,7 @@ import `in`.rcard.assertj.arrowcore.errors.EitherShouldContainInstanceOf.Compani
 import org.assertj.core.api.AbstractObjectAssert
 import org.assertj.core.internal.ComparisonStrategy
 import org.assertj.core.internal.StandardComparisonStrategy
+import java.util.function.Consumer
 
 /**
  * Assertions for [Either].
@@ -81,6 +82,12 @@ abstract class AbstractEitherAssert<
         return myself
     }
 
+    fun hasRightValueSatisfying(requirement: Consumer<RIGHT>): SELF {
+        assertIsRight()
+        actual.onRight { requirement.accept(it) }
+        return myself
+    }
+
     private fun assertIsRight() {
         isNotNull
         if (!actual.isRight()) {
@@ -114,6 +121,12 @@ abstract class AbstractEitherAssert<
         return myself
     }
 
+    fun hasLeftValueSatisfying(requirement: Consumer<LEFT>): SELF {
+        assertIsLeft()
+        actual.onLeft { requirement.accept(it) }
+        return myself
+    }
+
     private fun assertIsLeft() {
         isNotNull
         if (!actual.isLeft()) {

src/main/kotlin/in/rcard/assertj/arrowcore/AbstractOptionAssert.kt

@@ -8,6 +8,7 @@ import `in`.rcard.assertj.arrowcore.errors.OptionShouldContainInstanceOf.Compani
 import org.assertj.core.api.AbstractObjectAssert
 import org.assertj.core.internal.ComparisonStrategy
 import org.assertj.core.internal.StandardComparisonStrategy
+import java.util.function.Consumer
 
 /**
  * Assertions for [Option].
@@ -85,6 +86,12 @@ abstract class AbstractOptionAssert<
         return myself
     }
 
+    fun hasValueSatisfying(requirement: Consumer<VALUE>): SELF {
+        assertValueIsPresent()
+        actual.onSome { requirement.accept(it) }
+        return myself
+    }
+
     private fun assertValueIsPresent() {
         isNotNull
         if (actual.isEmpty()) throwAssertionError(shouldBePresent())