Bael 7757 (#16485)

* BAEL-7765: How to fix JsonParseException: Unexpected character (code 115) when parsing unquoted JSON in Jackson

* BAEL-7757: How to solve MockitoException: the existing mock registration must be deregistered

testing-modules/mockito-simple/src/test/java/com/baeldung/mockito/mockstatic/StaticMockRegistrationUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.mockito.mockstatic;
+
+import com.baeldung.mockito.mockedstatic.StaticUtils;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mockStatic;
+
+public class StaticMockRegistrationUnitTest {
+
+    private MockedStatic<StaticUtils> mockStatic;
+
+    @Before
+    public void setUp() {
+        // Registering a static mock for UserService before each test
+        mockStatic = mockStatic(StaticUtils.class);
+    }
+
+    @After
+    public void tearDown() {
+        // Closing the mockStatic after each test
+        mockStatic.close();
+    }
+
+    @Test
+    public void givenStaticMockRegistration_whenMocked_thenReturnsMockSuccessfully() {
+        // Ensure that the static mock for UserService is registered
+        assertTrue(Mockito.mockingDetails(StaticUtils.class).isMock());
+    }
+
+    @Test
+    public void givenAnotherStaticMockRegistration_whenMocked_thenReturnsMockSuccessfully() {
+        // Ensure that the static mock for UserService is registered
+        assertTrue(Mockito.mockingDetails(StaticUtils.class).isMock());
+    }
+}