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STF-322: Add tests for transport-failure retry
Cover all 8 scenarios: connection-reset retry on score and reportTransaction endpoints, no retry on HttpTimeoutException, retry on connect timeout (deterministic via a closed local ServerSocket), no retry on 4xx/5xx, .maxRetries(0) opt-out, and pre-interrupt short-circuit. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎src/test/java/com/maxmind/minfraud/WebServiceClientTest.java‎

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@@ -22,8 +22,10 @@
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import com.github.tomakehurst.wiremock.http.Fault;
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import com.github.tomakehurst.wiremock.junit5.WireMockExtension;
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import com.github.tomakehurst.wiremock.junit5.WireMockTest;
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import com.github.tomakehurst.wiremock.stubbing.Scenario;
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import com.maxmind.minfraud.exception.AuthenticationException;
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import com.maxmind.minfraud.exception.HttpException;
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import com.maxmind.minfraud.exception.InsufficientFundsException;
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import com.maxmind.minfraud.response.InsightsResponse;
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import com.maxmind.minfraud.response.IpRiskReason;
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import com.maxmind.minfraud.response.ScoreResponse;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.ProxySelector;
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import java.net.http.HttpClient;
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import java.net.http.HttpTimeoutException;
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import java.time.Duration;
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import java.util.List;
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import org.junit.jupiter.api.Test;
@@ -423,4 +427,242 @@ public void testHttpClientWithProxyThrowsException() {
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assertEquals("Cannot set both httpClient and proxy. " +
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"Configure proxy on the provided HttpClient instead.", ex.getMessage());
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}
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@Test
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public void testRetriesOnConnectionReset_score() throws Exception {
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var responseContent = readJsonFile("score-response");
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var url = "/minfraud/v2.0/score";
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-score")
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.whenScenarioStateIs(Scenario.STARTED)
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER))
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.willSetStateTo("succeeded"));
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-score")
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.whenScenarioStateIs("succeeded")
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.willReturn(aResponse()
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.withStatus(200)
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.withHeader("Content-Type",
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"application/vnd.maxmind.com-minfraud-score+json; charset=UTF-8; version=2.0\n")
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.withBody(responseContent)));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.build();
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var response = client.score(fullTransaction());
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JSONAssert.assertEquals(responseContent, response.toJson(), true);
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wireMock.verify(2, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testRetriesOnConnectionReset_reportTransaction() throws Exception {
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var url = "/minfraud/v2.0/transactions/report";
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-report")
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.whenScenarioStateIs(Scenario.STARTED)
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER))
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.willSetStateTo("succeeded"));
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-report")
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.whenScenarioStateIs("succeeded")
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.willReturn(aResponse().withStatus(204)));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.build();
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client.reportTransaction(fullTransactionReport());
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wireMock.verify(2, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testNoRetryOnHttpTimeoutException() {
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse()
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.withStatus(200)
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.withFixedDelay(2000)
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.withBody("{}")));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.requestTimeout(Duration.ofMillis(100))
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.build();
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assertThrows(HttpTimeoutException.class, () -> client.insights(fullTransaction()));
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wireMock.verify(1, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testNoRetryOn5xx() {
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse()
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.withStatus(500)
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.withHeader("Content-Type", "application/json")
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.withBody("")));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.build();
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assertThrows(HttpException.class, () -> client.insights(fullTransaction()));
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wireMock.verify(1, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testNoRetryOn4xx() {
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse()
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.withStatus(402)
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.withHeader("Content-Type", "application/json")
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.withBody("{\"code\":\"INSUFFICIENT_FUNDS\",\"error\":\"out of credit\"}")));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.build();
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assertThrows(InsufficientFundsException.class,
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() -> client.insights(fullTransaction()));
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wireMock.verify(1, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testMaxRetriesZeroDisablesRetry() {
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER)));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.maxRetries(0)
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.build();
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assertThrows(IOException.class, () -> client.insights(fullTransaction()));
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wireMock.verify(1, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testRetriesExhausted() {
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER)));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.maxRetries(2)
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.build();
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var ex = assertThrows(IOException.class, () -> client.insights(fullTransaction()));
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// 1 initial attempt + 2 retries.
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wireMock.verify(3, postRequestedFor(urlEqualTo(url)));
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// The final exception should carry the prior failures as suppressed
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// exceptions so the full retry history is visible in stack traces.
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assertEquals(2, ex.getSuppressed().length,
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"expected the 2 prior IOExceptions to be attached as suppressed");
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}
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@Test
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public void testCustomHttpClientStillRetries() throws Exception {
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// The Javadoc on Builder.httpClient(HttpClient) promises that the SDK's
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// transport-failure retry wraps any supplied client. Verify it.
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var responseContent = readJsonFile("score-response");
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var url = "/minfraud/v2.0/score";
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-custom-client")
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.whenScenarioStateIs(Scenario.STARTED)
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER))
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.willSetStateTo("succeeded"));
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wireMock.stubFor(post(urlEqualTo(url))
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.inScenario("retry-custom-client")
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.whenScenarioStateIs("succeeded")
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.willReturn(aResponse()
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.withStatus(200)
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.withHeader("Content-Type",
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"application/vnd.maxmind.com-minfraud-score+json; charset=UTF-8; version=2.0\n")
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.withBody(responseContent)));
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var customClient = HttpClient.newBuilder().build();
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.httpClient(customClient)
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.build();
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var response = client.score(fullTransaction());
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assertNotNull(response);
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wireMock.verify(2, postRequestedFor(urlEqualTo(url)));
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}
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@Test
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public void testNegativeMaxRetriesThrows() {
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var builder = new WebServiceClient.Builder(6, "0123456789");
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assertThrows(IllegalArgumentException.class, () -> builder.maxRetries(-1));
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}
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@Test
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public void testInterruptedThreadAbortsBeforeSend() {
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// When the calling thread is already interrupted, HttpClient.send
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// checks the interrupt status and throws InterruptedException before
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// dispatching any wire request. The exception is caught and rewrapped
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// as MinFraudException, with the interrupt flag restored on the
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// calling thread. The wire-count assertion (zero) guards against a
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// regression where a pre-interrupt would silently let the request
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// proceed. NOTE: this test does not exercise the predicate's own
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// Thread.currentThread().isInterrupted() short-circuit, since the JDK
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// aborts before that branch can be reached; a true mid-flight
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// interrupt is hard to test deterministically.
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var url = "/minfraud/v2.0/insights";
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wireMock.stubFor(post(urlEqualTo(url))
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.willReturn(aResponse().withFault(Fault.CONNECTION_RESET_BY_PEER)));
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var client = new WebServiceClient.Builder(6, "0123456789")
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.host("localhost")
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.port(wireMock.getPort())
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.disableHttps()
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.build();
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Thread.currentThread().interrupt();
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try {
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assertThrows(MinFraudException.class, () -> client.insights(fullTransaction()));
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assertTrue(Thread.currentThread().isInterrupted(),
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"interrupt flag should remain set after the call");
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} finally {
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// Clear the interrupt flag so it does not leak to other tests
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// (and so wireMock.verify below isn't affected by it).
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Thread.interrupted();
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}
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wireMock.verify(0, postRequestedFor(urlEqualTo(url)));
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}
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}

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