Improve LogBackTester interface

src/test/java/emissary/test/core/junit5/LogbackTester.java

@@ -3,14 +3,20 @@
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.classic.spi.IThrowableProxy;
 import ch.qos.logback.core.read.ListAppender;
 import org.apache.commons.lang3.Validate;
 import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.util.List;
+import java.util.Optional;
+import javax.annotation.Nullable;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 public class LogbackTester implements Closeable {
     public final String name;
@@ -30,6 +36,30 @@ public LogbackTester(final String name) {
         logger.setAdditive(false);
     }
 
+    public void checkLogList(List<SimplifiedLogEvent> events) {
+        Validate.notNull(events, "Required: events != null");
+
+        assertEquals(events.size(), appender.list.size(), "Expected lengths do not match number of log messages");
+
+        for (int i = 0; i < appender.list.size(); i++) {
+            final ILoggingEvent item = appender.list.get(i);
+            final SimplifiedLogEvent event = events.get(i);
+            assertEquals(event.level, item.getLevel(), "Levels not equal for element " + i);
+            assertEquals(event.message, item.getFormattedMessage(), "Messages not equal for element " + i);
+            if (event.throwable.isEmpty()) {
+                assertNull(item.getThrowableProxy(), "Expected no exception for element" + i);
+            } else {
+                assertNotNull(item.getThrowableProxy(), "Expected an exception for element" + i);
+                Throwable expected = event.throwable.get();
+                IThrowableProxy proxy = item.getThrowableProxy();
+                assertEquals(expected.getClass().getName(), proxy.getClassName(), "Exception class name not equal for element " + i);
+                assertEquals(expected.getLocalizedMessage(), proxy.getMessage(), "Exception message not equal for element " + i);
+            }
+
+        }
+    }
+
+
     public void checkLogList(final Level[] levels, final String[] messages, final boolean[] throwables) {
         Validate.notNull(levels, "Required: levels != null");
         Validate.notNull(messages, "Required: messages != null");
@@ -44,12 +74,25 @@ public void checkLogList(final Level[] levels, final String[] messages, final bo
 
             assertEquals(levels[i], item.getLevel(), "Levels not equal for element " + i);
             assertEquals(messages[i], item.getFormattedMessage(), "Messages not equal for element " + i);
-            assertEquals(throwables[i], item.getThrowableProxy() != null, "Throwables not equal for elmeent " + i);
+            assertEquals(throwables[i], item.getThrowableProxy() != null, "Throwables not equal for element " + i);
         }
     }
 
     @Override
     public void close() throws IOException {
         logger.detachAndStopAllAppenders();
     }
+
+    public static class SimplifiedLogEvent {
+        public final Level level;
+        public final String message;
+        public final Optional<? extends Throwable> throwable;
+
+        public SimplifiedLogEvent(Level level, String message, @Nullable Throwable throwable) {
+            this.level = level;
+            this.message = message;
+            this.throwable = Optional.ofNullable(throwable);
+        }
+    }
+
 }

src/test/java/emissary/test/core/junit5/LogbackTesterTest.java

@@ -0,0 +1,99 @@
+package emissary.test.core.junit5;
+
+import ch.qos.logback.classic.Level;
+import org.junit.jupiter.api.Test;
+import org.opentest4j.AssertionFailedError;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class LogbackTesterTest extends UnitTest {
+    protected Logger logger = LoggerFactory.getLogger("TESTY");
+
+    @Test
+    void canCreateTester() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester);
+    }
+
+    @Test
+    void canCheckSingleEvent() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester);
+        List<LogbackTester.SimplifiedLogEvent> events = new ArrayList<>();
+        LogbackTester.SimplifiedLogEvent event2 = new LogbackTester.SimplifiedLogEvent(Level.WARN, "Not good news.", new Exception("worse news"));
+        events.add(event2);
+        logger.warn("Not good news.", new Exception("worse news"));
+        assertDoesNotThrow(() -> logBackTester.checkLogList(events));
+    }
+
+    @Test
+    void canDetectWrongMessage() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester, "Expected tester to not be null.");
+        List<LogbackTester.SimplifiedLogEvent> events = new ArrayList<>();
+        LogbackTester.SimplifiedLogEvent event2 = new LogbackTester.SimplifiedLogEvent(Level.WARN, "Wrong Message.", new Exception("worse news"));
+        events.add(event2);
+        logger.warn("Not good news.", new Exception("worse news"));
+        AssertionFailedError thrownException =
+                assertThrows(AssertionFailedError.class, () -> logBackTester.checkLogList(events), "Expected and exception.");
+        assertTrue(thrownException.getMessage().startsWith("Messages not equal"));
+    }
+
+    @Test
+    void canDetectWrongLevel() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester, "Expected tester to not be null.");
+        List<LogbackTester.SimplifiedLogEvent> events = new ArrayList<>();
+        LogbackTester.SimplifiedLogEvent event3 = new LogbackTester.SimplifiedLogEvent(Level.INFO, "Not good news.", new Exception("worse news"));
+        events.add(event3);
+        logger.warn("Not good news.", new Exception("worse news"));
+        AssertionFailedError thrownException =
+                assertThrows(AssertionFailedError.class, () -> logBackTester.checkLogList(events), "Expected and exception.");
+        assertTrue(thrownException.getMessage().startsWith("Levels not equal"));
+    }
+
+    @Test
+    void canDetectWrongThrowable() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester, "Expected tester to not be null.");
+        List<LogbackTester.SimplifiedLogEvent> events = new ArrayList<>();
+        LogbackTester.SimplifiedLogEvent event4 = new LogbackTester.SimplifiedLogEvent(Level.WARN, "Not good news.", new Exception("something"));
+        events.add(event4);
+        logger.warn("Not good news.", new Throwable("worse news"));
+        AssertionFailedError thrownException =
+                assertThrows(AssertionFailedError.class, () -> logBackTester.checkLogList(events), "Expected an exception.");
+        assertTrue(thrownException.getMessage().startsWith("Exception class name not"));
+    }
+
+    @Test
+    void canDetectWrongThrowableMessage() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester, "Expected tester to not be null.");
+        List<LogbackTester.SimplifiedLogEvent> events = new ArrayList<>();
+        LogbackTester.SimplifiedLogEvent event4 = new LogbackTester.SimplifiedLogEvent(Level.WARN, "Not good news.", new Exception("something"));
+        events.add(event4);
+        logger.warn("Not good news.", new Exception("worse news"));
+        AssertionFailedError thrownException =
+                assertThrows(AssertionFailedError.class, () -> logBackTester.checkLogList(events), "Expected an exception.");
+        assertTrue(thrownException.getMessage().startsWith("Exception message not equal for"), thrownException.getMessage());
+    }
+
+    @Test
+    void canCheckOneEvent() {
+        LogbackTester logBackTester = new LogbackTester(logger.getName());
+        assertNotNull(logBackTester);
+        boolean[] throwing = new boolean[1];
+        String[] messages = new String[1];
+        Level[] levels = new Level[1];
+        levels[0] = Level.WARN;
+        messages[0] = "Not good news.";
+        throwing[0] = false;
+        logger.warn("Not good news.");
+        logBackTester.checkLogList(levels, messages, throwing);
+    }
+}