Add controller unit tests and test dependencies

src/test/java/com/openisle/controller/HelloControllerTest.java

@@ -0,0 +1,25 @@
+package com.openisle.controller;
+
+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.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(HelloController.class)
+@AutoConfigureMockMvc(addFilters = false)
+class HelloControllerTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void helloReturnsMessage() throws Exception {
+        mockMvc.perform(get("/api/hello"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.message").value("Hello, Authenticated User"));
+    }
+}