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@Test
void shouldPersistBattery() throws Exception {
    Battery mockBattery =
            new Battery("Gold Coast Mc", "9729", 50000);

    mockMvc
            .perform(
                    post("/batteries")
                            .content(objectMapper.writeValueAsString(mockBattery))
                            .contentType(MediaType.APPLICATION_JSON)

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@Test
void shouldReturnAllBatteries() throws Exception {
    mockMvc
            .perform(get("/batteries/"))
            .andDo(print())
            .andExpect(status().isOk())
            .andExpect(jsonPath("$").isArray())
            .andExpect(jsonPath("$", Matchers.hasSize(H2Bootstrap.mockBatteries.size())));
}

roshanadh

package np.com.roshanadhikary.testdemo;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

@SpringBootTest
@AutoConfigureMockMvc
class ApplicationTests {
  // ..

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package np.com.roshanadhikary.testdemo;

@SpringBootTest
@AutoConfigureMockMvc
class ApplicationTests {

	@Autowired
	private MockMvc mockMvc;

	@Autowired

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spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=user
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

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package np.com.roshanadhikary.testdemo.bootstrap;

/**
 * Bootstrap the in-memory H2 database with some Battery resources when
 * the application starts
 */
@Configuration
public class H2Bootstrap {

    private static final Logger logger = LoggerFactory.getLogger(H2Bootstrap.class);

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package np.com.roshanadhikary.testdemo.repository;

import np.com.roshanadhikary.testdemo.entity.Battery;
import org.springframework.data.jpa.repository.JpaRepository;

public interface BatteryRepository extends JpaRepository<Battery, Integer> {
}

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package np.com.roshanadhikary.testdemo.entity;

import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;

import javax.persistence.*;

/** 

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/**
 * Find the distinct denominations required for a transaction
 */
// list of denominations
const denoms = [1000, 500, 100, 50, 20, 10, 5, 2, 1];

// return array of denoms smaller than or equal to the passed remainder
const getValidDenoms = (remainder) => {
	return denoms.filter((el) => {
		return el <= remainder;

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This blog post has been pushed to the respository after deployment to Heroku.
Let's hope this works!