Add some tests.

src/main/java/net/ladenthin/bitcoinaddressfinder/cli/Main.java

@@ -18,15 +18,15 @@
 // @formatter:on
 package net.ladenthin.bitcoinaddressfinder.cli;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.gson.Gson;
-import java.io.File;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 import net.ladenthin.bitcoinaddressfinder.AddressFilesToLMDB;
 import net.ladenthin.bitcoinaddressfinder.Finder;
 import net.ladenthin.bitcoinaddressfinder.Interruptable;
@@ -40,7 +40,8 @@
 // VM option: -Dorg.slf4j.simpleLogger.defaultLogLevel=trace
 public class Main implements Runnable, Interruptable {
 
-    private final static Logger logger = LoggerFactory.getLogger(Main.class);
+    @VisibleForTesting
+    public static Logger logger = LoggerFactory.getLogger(Main.class);
 
     private final List<Interruptable> interruptables = new ArrayList<>();
 
@@ -109,6 +110,23 @@ public void run() {
                 throw new UnsupportedOperationException("Command: " + configuration.command.name() + " currently not supported." );
         }
         logger.info("Main#run end.");
+
+        if(false) {
+            try {
+                Thread.sleep(2000L);
+            } catch (InterruptedException ex) {
+
+            }
+            Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
+            for (Thread thread : threadSet) {
+                System.out.println("##################################################");
+                System.out.println("#thread: " + thread);
+                StackTraceElement[] stackTrace = thread.getStackTrace();
+                for (StackTraceElement stackTraceElement : stackTrace) {
+                    System.out.println(stackTraceElement);
+                }
+            }
+        }
     }
 
     private void addSchutdownHook() {

src/test/java/net/ladenthin/bitcoinaddressfinder/MainTest.java

@@ -24,7 +24,17 @@
 
 import java.io.IOException;
 import java.nio.file.Path;
+import java.util.List;
 import net.ladenthin.bitcoinaddressfinder.cli.Main;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import org.mockito.ArgumentCaptor;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import org.slf4j.Logger;
 
 public class MainTest {
 
@@ -64,4 +74,23 @@ public void testOpenCLInfo_configurationGiven_noExceptionThrown() throws IOExcep
         mainFind_SecretsFile.run();
     }
     // </editor-fold>
+
+    // <editor-fold defaultstate="collapsed" desc="invalidArgument">
+    @Test
+    public void main_noArgumentGiven_errorLogged() throws IOException, InterruptedException {
+        // arrange
+        Logger logger = mock(Logger.class);
+        when(logger.isTraceEnabled()).thenReturn(true);
+        Main.logger = logger;
+
+        // act
+        Main.main(new String[0]);
+
+        // assert
+        ArgumentCaptor<String> logCaptor = ArgumentCaptor.forClass(String.class);
+        List<String> arguments = logCaptor.getAllValues();
+        verify(logger, times(1)).error(logCaptor.capture());
+        assertThat(arguments.get(0), is(equalTo("Invalid arguments. Pass path to configuration as first argument.")));
+    }
+    // </editor-fold>
 }