addition of further unit tests

pom.xml

@@ -65,6 +65,12 @@
 			<version>1.5.16</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<version>5.14.2</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 	<scm>

src/test/java/de/taimos/gpsd4java/api/DistanceListenerTest.java

@@ -0,0 +1,50 @@
+package de.taimos.gpsd4java.api;
+
+import de.taimos.gpsd4java.types.TPVObject;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class DistanceListenerTest {
+
+  @Test
+  public void testDistanceListener() {
+
+    final boolean[] called = new boolean[1];
+
+    final DistanceListener distanceListener =
+        new DistanceListener(100.0) {
+          @Override
+          protected void handleLocation(final TPVObject tpv) {
+            called[0] = true;
+          }
+        };
+
+    final TPVObject tpvObject1 = Mockito.mock(TPVObject.class);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(1.0);
+    Mockito.when(tpvObject1.getLatitude()).thenReturn(1.0);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(1.0);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(1.0);
+
+    final TPVObject tpvObject2 = Mockito.mock(TPVObject.class);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(2.0);
+    Mockito.when(tpvObject1.getLatitude()).thenReturn(2.0);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(2.0);
+    Mockito.when(tpvObject1.getLongitude()).thenReturn(2.0);
+
+    // first call, lastPosition is null, should call handleLocation
+    called[0] = false;
+    distanceListener.handleTPV(tpvObject1);
+    Assert.assertTrue(called[0]);
+
+    // second call, lastPosition is set, same position so no call
+    called[0] = false;
+    distanceListener.handleTPV(tpvObject1);
+    Assert.assertFalse(called[0]);
+
+    // third call, lastPosition is set, other position so should call
+    called[0] = false;
+    distanceListener.handleTPV(tpvObject2);
+    Assert.assertTrue(called[0]);
+  }
+}

src/test/java/de/taimos/gpsd4java/backend/GISToolTest.java

@@ -0,0 +1,28 @@
+package de.taimos.gpsd4java.backend;
+
+import de.taimos.gpsd4java.types.TPVObject;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class GISToolTest {
+
+  @Test
+  public void testDistance() {
+
+    // the distance between 1,1 and 2,2 is about 157 kilometers
+
+    final TPVObject one = Mockito.mock(TPVObject.class);
+    Mockito.when(one.getLongitude()).thenReturn(1.0);
+    Mockito.when(one.getLatitude()).thenReturn(1.0);
+
+    final TPVObject two = Mockito.mock(TPVObject.class);
+    Mockito.when(two.getLongitude()).thenReturn(2.0);
+    Mockito.when(two.getLatitude()).thenReturn(2.0);
+
+    Assert.assertEquals(157.2254320380729, GISTool.getDistance(one, two), 0.0);
+
+    Assert.assertEquals(0, GISTool.getDistance(one, one), 0.0);
+    Assert.assertEquals(0, GISTool.getDistance(two, two), 0.0);
+  }
+}

src/test/resources/logback.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration>
+
+<configuration>
+    <import class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"/>
+    <import class="ch.qos.logback.core.ConsoleAppender"/>
+
+    <appender name="STDOUT" class="ConsoleAppender">
+        <encoder class="PatternLayoutEncoder">
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%kvp- %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+</configuration>