Add mail controller tests

application/module-mail/src/test/java/org/fuseri/modulemail/service/MailControllerTest.java

+package org.fuseri.modulemail.service;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class MailControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void getEmail() throws Exception {
+        mockMvc.perform(get("/mail/{id}", 1))
+                .andExpect(status().isOk());
+    }
+
+    @Test
+    void deleteMail() throws Exception {
+        mockMvc.perform(delete("/mail/delete/{id}", 1))
+                .andExpect(status().isOk());
+    }
+
+}
\ No newline at end of file