Add log messages if the reports are disabled or dry run enabled

Signed-off-by: Andru Stefanescu <als209@cam.ac.uk>

build.gradle

@@ -157,8 +157,7 @@ configure(subprojects.findAll { !it.name.contains("android") }) {
     dependencies {
         implementation "org.slf4j:slf4j-api:$slf4jVersion"
 
-        testImplementation "org.slf4j:jcl-over-slf4j:$slf4jVersion"
-        testImplementation "org.slf4j:slf4j-simple:$slf4jVersion"
+        testImplementation "org.slf4j:slf4j-jdk14:$slf4jVersion"
         testImplementation "junit:junit:$junitVersion"
         testImplementation "org.assertj:assertj-core:$assertjVersion"
         testImplementation "com.tngtech.java:junit-dataprovider:$junitDataproviderVersion"
@@ -177,7 +176,6 @@ configure(subprojects.findAll { !it.name.contains("android") }) {
     test {
         systemProperty 'jgiven.report.dir', 'build/reports/jgiven/json'
         systemProperty 'jgiven.report.text', 'false'
-        systemProperty 'org.slf4j.simpleLogger.defaultLogLevel', 'warn'
 
         if (jacocoEnabled) {
             jacoco {

jgiven-core/src/main/java/com/tngtech/jgiven/impl/Config.java

@@ -38,11 +38,22 @@ public static Config config() {
     }
 
     static {
+        logDryRunEnabled();
+        logReportEnabled();
+    }
+
+    static void logDryRunEnabled() {
         if (INSTANCE.dryRun()) {
             log.info("Dry Run enabled.");
         }
     }
 
+    static void logReportEnabled() {
+        if (!INSTANCE.isReportEnabled()) {
+            log.info("Please note that the report generation is turned off.");
+        }
+    }
+
     private Config() {
     }
 

jgiven-core/src/test/java/com/tngtech/jgiven/impl/ConfigTest.java

@@ -7,10 +7,13 @@
 import com.google.common.io.FileWriteMode;
 import com.google.common.io.Files;
 import com.tngtech.jgiven.config.ConfigValue;
+import com.tngtech.jgiven.impl.TestUtil.JGivenLogHandler;
 import java.io.File;
 import java.lang.reflect.Constructor;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
@@ -23,16 +26,67 @@ public class ConfigTest {
     public TemporaryFolder temporaryFolder = new TemporaryFolder();
 
     private final Map<String, String> systemPropertiesBackup = new HashMap<>();
+    private final JGivenLogHandler handler = new JGivenLogHandler();
     private CharSink jgivenConfig;
 
     @Before
     public void setupPropertiesFile() throws Exception {
+        Logger.getLogger(Config.class.getName()).addHandler(handler);
         File configFile = temporaryFolder.newFile();
         jgivenConfig = Files.asCharSink(configFile, Charsets.UTF_8, FileWriteMode.APPEND);
         setSystemProperty("jgiven.config.path", configFile.getAbsolutePath());
         setSystemProperty("jgiven.report.dir", null);
     }
 
+    @After
+    public void teardown() {
+        Logger.getLogger(Config.class.getName()).removeHandler(handler);
+    }
+
+    @Test
+    public void disabledReportsLogAMessage() {
+        setSystemProperty("jgiven.report.enabled", "false");
+
+        JGivenLogHandler.resetEvents();
+        Config.logReportEnabled();
+
+        assertThat(JGivenLogHandler.containsLoggingEvent("Please note that the report generation is turned off.",
+                                                                Level.INFO)).isTrue();
+    }
+
+    @Test
+    public void enabledReportsDontLogAMessage() {
+        setSystemProperty("jgiven.report.enabled", "true");
+
+        JGivenLogHandler.resetEvents();
+        Config.logReportEnabled();
+
+        assertThat(JGivenLogHandler.containsLoggingEvent("Please note that the report generation is turned off.",
+                                                            Level.INFO)).isFalse();
+    }
+
+    @Test
+    public void dryRunEnabledLogsAMessage() {
+        setSystemProperty("jgiven.report.dry-run", "true");
+
+        JGivenLogHandler.resetEvents();
+        Config.logDryRunEnabled();
+
+        assertThat(JGivenLogHandler.containsLoggingEvent("Dry Run enabled.",
+                Level.INFO)).isTrue();
+    }
+
+    @Test
+    public void dryRunDisabledDoesntLogAMessage() {
+        setSystemProperty("jgiven.report.dry-run", "false");
+
+        JGivenLogHandler.resetEvents();
+        Config.logDryRunEnabled();
+
+        assertThat(JGivenLogHandler.containsLoggingEvent("Dry Run enabled.",
+                Level.INFO)).isFalse();
+    }
+
     @Test
     public void configValuesHaveDefaults() throws Exception {
         Config underTest = createNewTestInstance();

jgiven-core/src/test/java/com/tngtech/jgiven/impl/TestUtil/JGivenLogHandler.java

@@ -0,0 +1,32 @@
+package com.tngtech.jgiven.impl.TestUtil;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+
+public class JGivenLogHandler extends Handler {
+    static private List<LogRecord> logList = new ArrayList<>();
+
+    @Override
+    public void publish(LogRecord record) {
+        logList.add(record);
+    }
+
+    @Override
+    public void flush() {
+        resetEvents();
+    }
+
+    @Override
+    public void close() throws SecurityException {}
+
+    public static boolean containsLoggingEvent(String message, Level level) {
+        return logList.stream().anyMatch(logRecord -> logRecord.getMessage().equals(message)
+                                        && logRecord.getLevel().equals(level));
+    }
+    public static void resetEvents() {
+        logList.clear();
+    }
+}