test: Add new acceptance test project

Signed-off-by: Henry Kupty <hkupty@gmail.com>

pom.xml

@@ -46,6 +46,7 @@
     <module>osgi-over-slf4j</module>
     <module>integration</module>
     <module>slf4j-migrator</module>
+    <module>slf4j-test</module>
   </modules>
 
   <dependencyManagement>

slf4j-simple/pom.xml

@@ -36,6 +36,14 @@
       <version>${project.version}</version>
       <scope>test</scope>
     </dependency>
+
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-test</artifactId>
+      <type>jar</type>
+      <version>${project.version}</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
 </project>

slf4j-simple/src/test/java/org/slf4j/simple/AcceptanceTest.java

@@ -0,0 +1,49 @@
+package org.slf4j.simple;
+
+import org.slf4j.Logger;
+import org.slf4j.event.Level;
+import org.slf4j.test.LoggerTestSuite;
+
+import java.io.PrintStream;
+
+public class AcceptanceTest extends LoggerTestSuite {
+
+    @Override
+    public Logger createLogger(ListAppendingOutputStream outputStream, Level level) {
+        SimpleLogger.CONFIG_PARAMS.outputChoice = new OutputChoice(new PrintStream(outputStream));
+
+        SimpleLogger logger = new SimpleLogger("TestSuiteLogger");
+        logger.currentLogLevel = SimpleLoggerConfiguration.stringToLevel(level.toString());
+        return logger;
+    }
+
+    @Override
+    public String extractMessage(String message) {
+        return message
+                .split("\n")[0]
+                .split("- ")[1];
+    }
+
+    @Override
+    public String extractExceptionMessage(String message) {
+        String[] logLines = message.split("\n");
+
+        if (logLines.length < 2) {
+            return null;
+        }
+        String exceptionLine = logLines[1];
+        return exceptionLine.split(": ")[1];
+    }
+
+    @Override
+    public String extractExceptionType(String message) {
+        String[] logLines = message.split("\n");
+
+        if (logLines.length < 2) {
+            return null;
+        }
+        String exceptionLine = logLines[1];
+        return exceptionLine.split(": ")[0];
+    }
+
+}

slf4j-test/pom.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.slf4j</groupId>
+    <artifactId>slf4j-parent</artifactId>
+    <version>2.0.10-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
+  </parent>
+
+  <artifactId>slf4j-test</artifactId>
+
+  <packaging>jar</packaging>
+  <name>SLF4J Tests</name>
+  <description>SLF4J Implementation Acceptance Tests</description>
+  <url>http://www.slf4j.org</url>
+
+  <properties>
+    <module-name>org.slf4j.test</module-name>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>${junit.version}</version>
+    </dependency>
+
+  </dependencies>
+
+</project>

slf4j-test/src/main/java/org/slf4j/test/LoggerTestSuite.java

@@ -0,0 +1,232 @@
+package org.slf4j.test;
+
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.event.Level;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+
+public abstract class LoggerTestSuite {
+
+    public static class ListAppendingOutputStream extends OutputStream {
+        private final StringBuilder word = new StringBuilder();
+        private final List<String> list;
+
+        private ListAppendingOutputStream(List<String> list) {this.list = list;}
+
+
+        @Override
+        public void write(int b) throws IOException {
+            word.append((char) b);
+        }
+
+        @Override
+        public void flush() {
+            list.add(word.toString());
+            // Resets the string builder for a next log message
+            word.delete(0, word.length());
+        }
+    }
+
+    private ListAppendingOutputStream prepareSink(List<String> source) {
+        return new ListAppendingOutputStream(source);
+
+    }
+
+    @Test
+    public void testTrace() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.TRACE);
+
+        assertTrue("Trace level should be enabled for this test", configuredLogger.isTraceEnabled());
+        configuredLogger.trace("Simple trace message");
+
+        assertEquals("Trace message should've been captured", 1, loggingEvents.size());
+        assertTrue("Message should be logged in trace level", isLevel(loggingEvents.get(0), Level.TRACE));
+        assertEquals("Supplied trace message wasn't found in the log",
+                     "Simple trace message",
+                     extractMessage(loggingEvents.get(0)));
+
+        loggingEvents.clear();
+
+        configuredLogger.debug("Simple debug message");
+        configuredLogger.info("Simple info message");
+        configuredLogger.warn("Simple warn message");
+        configuredLogger.error("Simple error message");
+        assertEquals("The other levels should have been captured", 4, loggingEvents.size());
+
+    }
+
+    @Test
+    public void testDebug() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.DEBUG);
+
+        configuredLogger.trace("Simple trace message");
+        assertEquals("Lower levels should have been ignored", 0, loggingEvents.size());
+
+        assertTrue("Debug level should be enabled for this test", configuredLogger.isDebugEnabled());
+        configuredLogger.debug("Simple debug message");
+
+        assertEquals("Debug message should've been captured", 1, loggingEvents.size());
+        assertTrue("Message should be logged in debug level", isLevel(loggingEvents.get(0), Level.DEBUG));
+        assertEquals("Supplied debug message wasn't found in the log",
+                     "Simple debug message",
+                     extractMessage(loggingEvents.get(0)));
+
+        loggingEvents.clear();
+
+        configuredLogger.info("Simple info message");
+        configuredLogger.warn("Simple warn message");
+        configuredLogger.error("Simple error message");
+        assertEquals("The other levels should have been captured", 3, loggingEvents.size());
+    }
+
+
+    @Test
+    public void testInfo() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.INFO);
+
+        configuredLogger.trace("Simple trace message");
+        configuredLogger.debug("Simple debug message");
+        assertEquals("Lower levels should have been ignored", 0, loggingEvents.size());
+
+        assertTrue("Info level should be enabled for this test", configuredLogger.isInfoEnabled());
+        configuredLogger.info("Simple info message");
+
+        assertEquals("Info message should've been captured", 1, loggingEvents.size());
+        assertTrue("Message should be logged in debug level", isLevel(loggingEvents.get(0), Level.INFO));
+        assertEquals("Supplied info message wasn't found in the log",
+                     "Simple info message",
+                     extractMessage(loggingEvents.get(0)));
+
+        loggingEvents.clear();
+
+        configuredLogger.warn("Simple warn message");
+        configuredLogger.error("Simple error message");
+        assertEquals("The other levels should have been captured", 2, loggingEvents.size());
+    }
+
+    @Test
+    public void testWarn() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.WARN);
+
+        configuredLogger.trace("Simple trace message");
+        configuredLogger.debug("Simple debug message");
+        configuredLogger.info("Simple info message");
+        assertEquals("Lower levels should have been ignored", 0, loggingEvents.size());
+
+        assertTrue("Warn level should be enabled for this test", configuredLogger.isWarnEnabled());
+        configuredLogger.warn("Simple warn message");
+
+        assertEquals("Warn message should've been captured", 1, loggingEvents.size());
+        assertTrue("Message should be logged in warn level", isLevel(loggingEvents.get(0), Level.WARN));
+        assertEquals("Supplied warn message wasn't found in the log",
+                     "Simple warn message",
+                     extractMessage(loggingEvents.get(0)));
+
+        loggingEvents.clear();
+
+        configuredLogger.error("Simple error message");
+        assertEquals("The other levels should have been captured", 1, loggingEvents.size());
+    }
+
+    @Test
+    public void testError() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.ERROR);
+
+        configuredLogger.trace("Simple trace message");
+        configuredLogger.debug("Simple debug message");
+        configuredLogger.info("Simple info message");
+        configuredLogger.warn("Simple warn message");
+        assertEquals("Lower levels should have been ignored", 0, loggingEvents.size());
+
+        assertTrue("Error level should be enabled for this test", configuredLogger.isErrorEnabled());
+        configuredLogger.error("Simple error message");
+
+        assertEquals("Error message should've been captured", 1, loggingEvents.size());
+        assertTrue("Message should be logged in error level", isLevel(loggingEvents.get(0), Level.ERROR));
+        assertEquals("Supplied error message wasn't found in the log",
+                     "Simple error message",
+                     extractMessage(loggingEvents.get(0)));
+    }
+
+    @Test
+    public void testFormatting() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.INFO);
+
+        configuredLogger.info("Some {} string", "formatted");
+        assertEquals("The formatted message should've been captured", 1, loggingEvents.size());
+        assertEquals("Message should've been formatted", "Some formatted string", extractMessage(loggingEvents.get(0)));
+    }
+
+    @Test
+    public void testException() {
+        ArrayList<String> loggingEvents = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(loggingEvents), Level.INFO);
+
+        Exception exception = new RuntimeException("My error");
+
+        configuredLogger.info("Logging with an exception", exception);
+        assertEquals("The formatted message should've been captured", 1, loggingEvents.size());
+        assertEquals("Message should've been formatted",
+                     "My error",
+                     extractExceptionMessage(loggingEvents.get(0)));
+
+        assertEquals("Message should've been formatted",
+                     "java.lang.RuntimeException",
+                     extractExceptionType(loggingEvents.get(0)));
+    }
+
+    /**
+     * Allows tests to check whether the logged message corresponds to the supplied level.
+     * Override if needed.
+     * @param message String containing the full log message
+     * @param level {@link Level} the message is expected to be in
+     * @return returns true if the level matches
+     */
+    protected boolean isLevel(String message, Level level) {
+        return message.toUpperCase().contains(level.toString());
+    }
+
+    /**
+     * Extracts only the part of the log string that should represent the `message` string.
+     * @param message the full log message
+     * @return only the supplied message
+     */
+    public abstract String extractMessage(String message);
+
+    /**
+     * Extracts only the part of the log string that should represent the supplied exception message, if any.
+     * @param message the full log message
+     * @return only the supplied exception message
+     */
+    public abstract String extractExceptionMessage(String message);
+
+    /**
+     * Extracts only the part of the log string that should represent the supplied exception type.
+     * @param message the full log message
+     * @return only the supplied exception type name
+     */
+    public abstract String extractExceptionType(String message);
+
+    /**
+     * Configures the logger for running the tests.
+     * @param outputStream The output stream for logs to be written to
+     * @param level The expected level the tests will run for this logger
+     * @return a configured logger able to run the tests
+     */
+    public abstract Logger createLogger(ListAppendingOutputStream outputStream, Level level);
+
+}

slf4j-test/src/main/java9/module-info.java

@@ -0,0 +1,4 @@
+module org.slf4j.test {
+  requires org.slf4j;
+  exports org.slf4j.test;
+}