Test for MDC logging.

log4j2-appender/src/test/java/pl/tkowalcz/tjahzi/log4j2/MdcLogLabelConfigurationTest.java

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+package pl.tkowalcz.tjahzi.log4j2;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.ThreadContext;
+import org.junit.jupiter.api.Test;
+import pl.tkowalcz.tjahzi.log4j2.infra.IntegrationTest;
+
+import java.util.UUID;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static pl.tkowalcz.tjahzi.log4j2.infra.LokiAssert.assertThat;
+
+class MdcLogLabelConfigurationTest extends IntegrationTest {
+
+    @Test
+    void shouldSendMdcLogLabelAsConfigured() {
+        // Given
+        loadConfig("appender-test-with-md-log-label-set.xml");
+        Logger logger = LogManager.getLogger(MdcLogLabelConfigurationTest.class);
+
+        // When
+        String tid = UUID.randomUUID().toString();
+        ThreadContext.put("tid", tid);
+
+        logger.info("Test");
+
+        // Then
+        assertThat(loki)
+                .returns(response -> response
+                        .body("data.result.size()", greaterThanOrEqualTo(1))
+                        .body("data.result[0].stream.server", equalTo("127.0.0.1"))
+                        .body("data.result[0].stream.tid1", equalTo(tid))
+                        .body("data.result[0].stream.tid2", equalTo(tid))
+                        .body("data.result[0].stream.tid3", equalTo(tid))
+                );
+    }
+}

log4j2-appender/src/test/resources/appender-test-with-md-log-label-set.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration packages="pl.tkowalcz.tjahzi.log4j2">
+    <Loggers>
+        <Root level="OFF">
+        </Root>
+
+        <Logger name="pl.tkowalcz" level="ALL">
+            <AppenderRef ref="Loki"/>
+        </Logger>
+    </Loggers>
+
+    <appenders>
+        <Loki name="Loki">
+            <host>${sys:loki.host}</host>
+            <port>${sys:loki.port}</port>
+
+            <ThresholdFilter level="ALL"/>
+            <PatternLayout>
+                <Pattern>%X{tid} [%t] %d{MM-dd HH:mm:ss.SSS} %5p %c{1} - %m%n%exception{full}</Pattern>
+            </PatternLayout>
+
+            <Header name="server" value="127.0.0.1"/>
+            <Label name="server" value="127.0.0.1"/>
+
+            <Label name="tid1" pattern="%X{tid}"/>
+            <Label name="tid2" value="${ctx:tid}"/>
+            <Label name="tid3" pattern="%mdc{tid}"/>
+        </Loki>
+    </appenders>
+</configuration>