build: add SLF4J SimpleLogger configuration for tests

build.gradle.kts

@@ -14,8 +14,10 @@ plugins {
 ///////////////////////////////////////////////////////////////////////////////
 
 dependencies {
-  implementation("org.slf4j:slf4j-api:1.7.32")
   implementation("com.google.code.gson:gson:2.10.1")
+  implementation("org.slf4j:slf4j-api:1.7.32")
+
+  testImplementation("org.slf4j:slf4j-simple:1.7.32")
   testImplementation(platform("org.junit:junit-bom:5.10.2"))
   testImplementation("org.junit.jupiter:junit-jupiter")
   testImplementation("org.junit.vintage:junit-vintage-engine")

src/main/java/org/eclipse/keyple/core/util/logging/spi/package-info.java

@@ -0,0 +1,6 @@
+/**
+ * SPI interfaces associated with the logging abstraction layer.
+ *
+ * @since 2.5.0
+ */
+package org.eclipse.keyple.core.util.logging.spi;

src/test/resources/simplelogger.properties

@@ -0,0 +1,36 @@
+# SLF4J's SimpleLogger configuration file
+# Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to System.err.
+
+# Default logging detail level for all instances of SimpleLogger.
+# Must be one of ("trace", "debug", "info", "warn", or "error").
+# If not specified, defaults to "info".
+org.slf4j.simpleLogger.defaultLogLevel=info
+
+# Logging detail level for a SimpleLogger instance named "xxxxx".
+# Must be one of ("trace", "debug", "info", "warn", or "error").
+# If not specified, the default logging detail level is used.
+#org.slf4j.simpleLogger.log.xxxxx=
+
+# Set to true if you want the current date and time to be included in output messages.
+# Default is false, and will output the number of milliseconds elapsed since startup.
+org.slf4j.simpleLogger.showDateTime=true
+
+# The date and time format to be used in the output messages.
+# The pattern describing the date and time format is the same that is used in java.text.SimpleDateFormat.
+# If the format is not specified or is invalid, the default format is used.
+# The default format is yyyy-MM-dd HH:mm:ss:SSS Z.
+org.slf4j.simpleLogger.dateTimeFormat=[HH:mm:ss:SSS]
+
+# Set to true if you want to output the current thread name.
+# Defaults to true.
+org.slf4j.simpleLogger.showThreadName=true
+
+# Set to true if you want the Logger instance name to be included in output messages.
+# Defaults to true.
+org.slf4j.simpleLogger.showLogName=false
+
+# Set to true if you want the last component of the name to be included in output messages.
+# Defaults to false.
+org.slf4j.simpleLogger.showShortLogName=true
+
+org.slf4j.simpleLogger.levelInBrackets=true