FIX: do not format log messages, when no parameter was specified

ebean-test/src/test/java/io/ebean/test/TestCaptureLogger.java

@@ -0,0 +1,36 @@
+package io.ebean.test;
+
+import io.ebeaninternal.api.SpiLogger;
+import io.ebeaninternal.api.SpiLoggerFactory;
+import io.ebeaninternal.server.logger.DLoggerFactory;
+import org.junit.jupiter.api.Test;
+import org.junit.platform.commons.logging.LoggerFactory;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class TestCaptureLogger {
+
+  @Test
+  void testDefaultLogger() {
+    SpiLogger logger = new DLoggerFactory().create("io.ebean.test.loggerTest");
+    doSomeLogs(logger);
+
+    CaptureLogger captureLogger = new CaptureLogger(logger);
+    captureLogger.start();
+    doSomeLogs(captureLogger);
+    assertThat(captureLogger.stop()).containsExactly(
+      "test {0}", "test {}", "test {bla}", "test {bla} {0}", "test {bla} {0}", "test {bla} 1", "test '{bla}' {0}");
+  }
+
+  void doSomeLogs(SpiLogger logger) {
+    logger.debug("test {0}"); // Returns "test {0}"
+    logger.debug("test {}"); // Returns "test {}"
+    logger.debug("test {bla}"); // Returns "test {bla}"
+    logger.debug("test {bla} {0}"); // Returns "test {bla} {0}"
+    logger.debug("test {bla} {0}", new Object[]{}); // Returns "test {bla} {0}"
+    //logger.debug("Test {bla} {0}", 1); // fails: "can't parse argument number: bla"
+    logger.debug("test '{bla}' {0}", 1); // Returns "test {bla} 1"
+    logger.debug("test '{bla}' {0}"); // Returns "test '{bla}' {0}"
+  }
+
+}