adding test file

provider/notification-azure/src/test/java/org/opengroup/osdu/notification/provider/azure/util/HandshakeFilterTest.java

+package org.opengroup.osdu.notification.provider.azure.util;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.opengroup.osdu.notification.provider.interfaces.IPubsubHandshakeHandler;
+import org.opengroup.osdu.notification.provider.interfaces.IPubsubRequestBodyExtractor;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+
+import static org.mockito.Mockito.*;
+
+
+@RunWith(MockitoJUnitRunner.class)
+public class HandshakeFilterTest {
+
+    @Mock
+    private IPubsubRequestBodyExtractor requestBodyExtractor;
+
+    @Mock
+    private IPubsubHandshakeHandler handshakeHandler;
+
+    @Mock
+    private HttpServletRequest httpServletRequest;
+
+    @Mock
+    private ServletResponse servletResponse;
+
+    @Mock
+    private FilterChain filterChain;
+
+    @InjectMocks
+    private HandshakeFilter sut;
+
+    @Test
+    public void should_CallFiltersIfNotHandshake() throws IOException, ServletException {
+        doReturn("records-changed").when(httpServletRequest).getServletPath();
+        doReturn(false).when(this.requestBodyExtractor).isHandshakeRequest();
+        this.sut.doFilter(this.httpServletRequest, this.servletResponse, this.filterChain);
+
+        verify(this.filterChain, times(1)).doFilter(httpServletRequest, servletResponse);
+    }
+}