Reynaldo Jose Abreu reyabreu

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Electrical Engineer turned Software Engineer by trade and passion. Current interests on Functional Programming, Cloud Dev, Machine Learning and API Design

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@eeveebank
Cambridge, UK
@rey_abreu

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reyabreu / TestUtils.java

Created December 9, 2019 15:51

A utility class that provides a method for finding a random freely available TCP/IP port. Mostly used in integration tests.

	public class TestUtils {

	// an AutoCloseable bean is needed to guarantee the found port is freed before we can use it
	private static class SocketHolder implements Closeable {

	private final ServerSocket socket;

	public SocketHolder(ServerSocket socket) {
	this.socket = socket;
	}

reyabreu / TestFooRequest.java

Last active December 3, 2019 10:43

Ensure properly created ObjectMapper is used in Retrofit's JacksonConverterFactory to serialise embedded Java Optionals in request body

	@RunWith(SpringRunner.class)
	@EnableAutoConfiguration(exclude = { SecurityAutoConfiguration.class })
	@SpringBootTest(
	classes = { TestFooRequest.FooController.class },
	webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT

	)
	@AutoConfigureMockMvc(secure = false)
	public class TestFooRequest {

reyabreu / UnitTest.java

Created November 8, 2019 18:22

Registering Spring Boot's default conversion service in unit tests (official docs are wrong!)

	@Configuration
	static class ConversionServiceConfiguration implements BeanFactoryPostProcessor {

	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
	beanFactory.setConversionService(ApplicationConversionService.getSharedInstance());
	}
	}

reyabreu / CustomProperties.java

Created October 8, 2019 12:45

Binding Spring Boot 2+ environment properties to a Map of entries

	@ConfigurationProperties("")
	public class CustomProperties {

	private Map<String, Object> mongodb = new HashMap<>();

	public Map<String, Object> getMongodb() {
	return ImmutableMap.copyOf(mongodb);
	}

	public void setMongodb(Map<String, Object> mongodb) {

reyabreu / SpelUnitTest.java

Created September 11, 2019 11:00

How to unit test Spel (Spring Expression Language) expressions against standard web context

	@RunWith(SpringRunner.class)
	@TestPropertySource("classpath:server-test.properties")
	public class SpelUnitTest {

	public static final Logger logger = LoggerFactory.getLogger(Sample.class);

	@Value("${testclock.start}")
	private String startTime;

	@Autowired

reyabreu / TestFormatStringIndexer.Java

Created November 29, 2018 15:49

Unit tests for the format String indexer

	import org.junit.Test;

	import static org.hamcrest.Matchers.is;
	import static org.junit.Assert.assertThat;

	public class TestFormatStringIndexer {

	@Test
	public void index_simpleSpecifiers_ok() {
	final String result = FormatStringIndexer.index("there are %d apples in the %s basket that cost %f", 1);

reyabreu / FormatStringIndexer.java

Created November 29, 2018 15:47

Adds format index specifiers to format strings that don't have them


	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	//helper class that adds format index specifiers to plain specifiers in format strings
	public class FormatStringIndexer {

	private static Pattern pattern = Pattern.compile("%[-#+\\s0,(]?\\d*(\\.\\d)?[bBhHsScCdDoxXeEfgGaAtT%n]");

	public static String index(final String formatString, int start) {

reyabreu / TestFibonacciStateMachine.java

Created November 27, 2018 12:11

Implemented a Fibonacci sequence generator using a state machine design pattern - just to highlight how individual states should manage their own logic and transitions and not depend on an external controlling context.

	import org.jetbrains.annotations.NotNull;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.beans.factory.annotation.Autowired;
	import org.springframework.context.annotation.Bean;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.test.context.ContextConfiguration;
	import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

reyabreu / featurebranchworkflow.md

Created September 28, 2018 14:12

Feature branch workflow on GitLab

Clone project:

git clone git@example.com:project-name.git

Create branch with your feature:

git checkout -b $feature_name

Write code. Commit changes:

git commit -am "My feature is ready"

Push your branch to GitLab:

reyabreu / gist:08f181dd86a0a6ac32e28e71816ce8af

Created September 28, 2018 13:54

Delete tag from local & remote branches

	# delete local tag 'mytag'
	git tag -d mytag

	# delete remote tag 'mytag' (e.g. GitHub version too)
	git push origin :refs/tags/mytag

	# alternative approach
	git push --delete origin mytag
	git tag -d mytag