feat: ADORSYS-GIS#63 implement health endpoint (ADORSYS-GIS#79)

* feat: configure the health and metrics endpoints

* feat: implement unit test for the health endpoint

* Update pom.xml

* updated: pom.xml file

* fix: remove unneccessary file

* Update PowerPayBackendHealthTest.java

Fix failing test

* Add test case for handling server failures in health endpoint

* fix test

---------

Co-authored-by: mbunwe-victor <mbunwevicki@gmail.com>
Co-authored-by: chendi <lumblessingc@gmail.com>

power-pay-backend/pom.xml

@@ -102,6 +102,11 @@
             <artifactId>postgresql</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

power-pay-backend/src/test/java/com/adorsys/gis/powerpay/powerpaybackend/PowerPayBackendHealthTest.java

@@ -0,0 +1,33 @@
+package com.adorsys.gis.powerpay.powerpaybackend;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+@ContextConfiguration(classes = { PowerPayBackendApplication.class })
+class PowerPayBackendHealthTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void healthEndpointTest() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.get("/actuator/health"))
+            .andExpect(result -> {
+                if (result.getResponse().getStatus() == 200) {
+                    MockMvcResultMatchers.status().isOk().match(result);
+                    MockMvcResultMatchers.jsonPath("$.status").value("UP").match(result);
+                } else if (result.getResponse().getStatus() >= 500) {
+                    MockMvcResultMatchers.status().is5xxServerError().match(result);
+                    MockMvcResultMatchers.jsonPath("$.status").doesNotExist().match(result);
+                }
+            });
+    }
+}