Context and Servlet Initialization Parameters (#4656)

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javax-servlets/src/test/java/com/baeldung/test/UserServletUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.servlets;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.mockito.Mockito.atLeast;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+public class UserServletUnitTest {
+    
+    private static HttpServletRequest request;
+    private static HttpServletResponse response;
+    
+    
+    @BeforeClass
+    public static void setUpHttpServletRequestMockInstance() {
+        request = mock(HttpServletRequest.class); 
+    }
+    
+    @BeforeClass
+    public static void setUpHttpServletResponsetMockInstance() {
+        response = mock(HttpServletResponse.class); 
+    }
+    
+    @Test
+    public void givenHttpServletRequestMockInstance_whenCalledgetParameter_thenCalledAtLeastOnce() {
+        request.getParameter("name");
+        verify(request, atLeast(1)).getParameter("name");
+    }
+    
+    @Test
+    public void givenHttpServletRequestMockInstance_whenCalledgetParameter_thenOneAssertion() {  
+        when(request.getParameter("name")).thenReturn("username");
+        assertThat(request.getParameter("name")).isEqualTo("username");
+    }
+    
+    @Test
+    public void givenHttpServletResponseMockInstance_whenCalledgetContentType_thenCalledAtLeastOnce() {
+        response.getContentType();
+        verify(response, atLeast(1)).getContentType();
+    }
+    
+    @Test
+    public void givenHttpServletResponseMockInstance_whenCalledgetContentType_thenOneAssertion() {
+        when(response.getContentType()).thenReturn("text/html");
+        assertThat(response.getContentType()).isEqualTo("text/html");
+    }
+}