Mockint objectmapper with mockito (#9017)

* Mockint objectmapper with mockito

* enforcing naming convention for test classes

* removed Spring

* removed unattended changes

* modified example

* simplified call stack in flower validator

testing-modules/mockito-2/src/test/java/com/baeldung/mockito/objectmapper/FlowerJsonStringValidatorUnitTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.mockito.objectmapper;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.anyString;
+import static org.mockito.Mockito.eq;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+public class FlowerJsonStringValidatorUnitTest {
+
+    @Mock
+    private ObjectMapper objectMapper;
+
+    private FlowerJsonStringValidator flowerJsonStringValidator;
+
+    @BeforeEach
+    public void setUp() {
+        flowerJsonStringValidator = new FlowerJsonStringValidator(objectMapper);
+    }
+
+    @Test
+    public void whenCallingHasPetalsWithPetals_thenReturnsTrue() throws JsonProcessingException {
+        Flower rose = new Flower("testFlower", 100);
+
+        when(objectMapper.readValue(anyString(), eq(Flower.class))).thenReturn(rose);
+
+        assertTrue(flowerJsonStringValidator.flowerHasPetals("this can be a very long json flower"));
+
+        verify(objectMapper, times(1)).readValue(anyString(), eq(Flower.class));
+    }
+
+    @Test
+    public void whenCallingHasPetalsWithZeroPetal_thenReturnsFalse() throws JsonProcessingException {
+        Flower rose = new Flower("testFlowerWithoutPetal", 0);
+
+        when(objectMapper.readValue(anyString(), eq(Flower.class))).thenReturn(rose);
+
+        assertFalse(flowerJsonStringValidator.flowerHasPetals("this can be a very long json flower"));
+
+        verify(objectMapper, times(1)).readValue(anyString(), eq(Flower.class));
+    }
+}