diff --git a/.gradle/8.14/executionHistory/executionHistory.bin b/.gradle/8.14/executionHistory/executionHistory.bin
index 0e40d550..d5b63b63 100644
Binary files a/.gradle/8.14/executionHistory/executionHistory.bin and b/.gradle/8.14/executionHistory/executionHistory.bin differ
diff --git a/.gradle/8.14/executionHistory/executionHistory.lock b/.gradle/8.14/executionHistory/executionHistory.lock
index 49b5cfeb..673f2b22 100644
Binary files a/.gradle/8.14/executionHistory/executionHistory.lock and b/.gradle/8.14/executionHistory/executionHistory.lock differ
diff --git a/.gradle/8.14/fileHashes/fileHashes.bin b/.gradle/8.14/fileHashes/fileHashes.bin
index 5777e66c..11141c63 100644
Binary files a/.gradle/8.14/fileHashes/fileHashes.bin and b/.gradle/8.14/fileHashes/fileHashes.bin differ
diff --git a/.gradle/8.14/fileHashes/fileHashes.lock b/.gradle/8.14/fileHashes/fileHashes.lock
index 48260868..a3033401 100644
Binary files a/.gradle/8.14/fileHashes/fileHashes.lock and b/.gradle/8.14/fileHashes/fileHashes.lock differ
diff --git a/.gradle/8.14/fileHashes/resourceHashesCache.bin b/.gradle/8.14/fileHashes/resourceHashesCache.bin
index 627fd171..a119f2b3 100644
Binary files a/.gradle/8.14/fileHashes/resourceHashesCache.bin and b/.gradle/8.14/fileHashes/resourceHashesCache.bin differ
diff --git a/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/.gradle/buildOutputCleanup/buildOutputCleanup.lock
index a4beab63..02f58e23 100644
Binary files a/.gradle/buildOutputCleanup/buildOutputCleanup.lock and b/.gradle/buildOutputCleanup/buildOutputCleanup.lock differ
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index ce1c62c7..d6733e47 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -5,6 +5,8 @@
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleHome" value="C:\Gradle\gradle-9.0.0" />
+        <option name="gradleJvm" value="17" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 8f86b33d..fe0b0dab 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,7 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="homebrew-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index ffe7c8fc..00000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/Template.test.iml" filepath="$PROJECT_DIR$/.idea/modules/Template.test.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/build/classes/java/main/hhn/temp/project/AssignmentManager.class b/build/classes/java/main/hhn/temp/project/AssignmentManager.class
index 66b2b20b..bb150d04 100644
Binary files a/build/classes/java/main/hhn/temp/project/AssignmentManager.class and b/build/classes/java/main/hhn/temp/project/AssignmentManager.class differ
diff --git a/build/classes/java/main/hhn/temp/project/Task.class b/build/classes/java/main/hhn/temp/project/Task.class
index b6356c16..c12dac23 100644
Binary files a/build/classes/java/main/hhn/temp/project/Task.class and b/build/classes/java/main/hhn/temp/project/Task.class differ
diff --git a/build/classes/java/test/hhn/temp/project/BadCasesTest.class b/build/classes/java/test/hhn/temp/project/BadCasesTest.class
index 49db1e17..19b4eac0 100644
Binary files a/build/classes/java/test/hhn/temp/project/BadCasesTest.class and b/build/classes/java/test/hhn/temp/project/BadCasesTest.class differ
diff --git a/build/classes/java/test/hhn/temp/project/GoodCasesTest.class b/build/classes/java/test/hhn/temp/project/GoodCasesTest.class
index 57d7f1b8..d33dc2b5 100644
Binary files a/build/classes/java/test/hhn/temp/project/GoodCasesTest.class and b/build/classes/java/test/hhn/temp/project/GoodCasesTest.class differ
diff --git a/build/jacoco/test.exec b/build/jacoco/test.exec
index afc26a5f..fbac83aa 100644
Binary files a/build/jacoco/test.exec and b/build/jacoco/test.exec differ
diff --git a/build/reports/problems/problems-report.html b/build/reports/problems/problems-report.html
index 1bf2a99e..532e5406 100644
--- a/build/reports/problems/problems-report.html
+++ b/build/reports/problems/problems-report.html
@@ -650,7 +650,7 @@ code + .copy-button {
 <script type="text/javascript">
 function configurationCacheProblems() { return (
 // begin-report-data
-{"diagnostics":[{"locations":[{}],"problem":[{"text":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 10.0."}],"contextualLabel":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated.","documentationLink":"https://docs.gradle.org/8.14/userguide/upgrading_version_8.html#groovy_space_assignment_syntax","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"properties-should-be-assigned-using-the-propname-value-syntax-setting-a-property-via-the-gradle-generated-propname-value-or-propname-value-syntax-in-groovy-dsl","displayName":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated."}],"solutions":[[{"text":"Use assignment ('exceptionFormat = <value>') instead."}]]}],"problemsReport":{"totalProblemCount":1,"buildName":"Template","requestedTasks":"","documentationLink":"https://docs.gradle.org/8.14/userguide/reporting_problems.html","documentationLinkCaption":"Problem report","summaries":[]}}
+{"diagnostics":[{"locations":[{}],"problem":[{"text":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated."}],"severity":"WARNING","problemDetails":[{"text":"This is scheduled to be removed in Gradle 10.0."}],"contextualLabel":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated.","documentationLink":"https://docs.gradle.org/8.14/userguide/upgrading_version_8.html#groovy_space_assignment_syntax","problemId":[{"name":"deprecation","displayName":"Deprecation"},{"name":"properties-should-be-assigned-using-the-propname-value-syntax-setting-a-property-via-the-gradle-generated-propname-value-or-propname-value-syntax-in-groovy-dsl","displayName":"Properties should be assigned using the 'propName = value' syntax. Setting a property via the Gradle-generated 'propName value' or 'propName(value)' syntax in Groovy DSL has been deprecated."}],"solutions":[[{"text":"Use assignment ('exceptionFormat = <value>') instead."}]]}],"problemsReport":{"totalProblemCount":1,"buildName":"Template","requestedTasks":"test","documentationLink":"https://docs.gradle.org/8.14/userguide/reporting_problems.html","documentationLinkCaption":"Problem report","summaries":[]}}
 // end-report-data
 );}
 </script>
diff --git a/build/reports/tests/test/classes/hhn.temp.project.BadCasesTest.html b/build/reports/tests/test/classes/hhn.temp.project.BadCasesTest.html
index a456ba38..12a1478c 100644
--- a/build/reports/tests/test/classes/hhn.temp.project.BadCasesTest.html
+++ b/build/reports/tests/test/classes/hhn.temp.project.BadCasesTest.html
@@ -23,7 +23,7 @@
 <tr>
 <td>
 <div class="infoBox" id="tests">
-<div class="counter">6</div>
+<div class="counter">8</div>
 <p>tests</p>
 </div>
 </td>
@@ -41,7 +41,7 @@
 </td>
 <td>
 <div class="infoBox" id="duration">
-<div class="counter">0.057s</div>
+<div class="counter">0.048s</div>
 <p>duration</p>
 </div>
 </td>
@@ -78,7 +78,7 @@
 <tr>
 <td class="success">Assert Add Task is programmed defensively</td>
 <td class="success">assertAddTaskOnlyAcceptsValidParameters()</td>
-<td class="success">0.002s</td>
+<td class="success">0.003s</td>
 <td class="success">passed</td>
 </tr>
 <tr>
@@ -88,15 +88,21 @@
 <td class="success">passed</td>
 </tr>
 <tr>
+<td class="success">Assert non-existent commands are recognized as such</td>
+<td class="success">assertInvalidCommandsDontCrash()</td>
+<td class="success">0.001s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
 <td class="success">Assert List isn't empty after adding a task</td>
 <td class="success">assertListNowEmptyAfterAdd()</td>
-<td class="success">0.046s</td>
+<td class="success">0.034s</td>
 <td class="success">passed</td>
 </tr>
 <tr>
 <td class="success">Assert that added tasks can't be Null</td>
 <td class="success">assertNewTasksAreNotNull()</td>
-<td class="success">0.002s</td>
+<td class="success">0.001s</td>
 <td class="success">passed</td>
 </tr>
 <tr>
@@ -106,6 +112,12 @@
 <td class="success">passed</td>
 </tr>
 <tr>
+<td class="success">Assert that removing a non-existent worker throws an Exception</td>
+<td class="success">assertRemovingNonExistentWorkerFails()</td>
+<td class="success">0.002s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
 <td class="success">Assert that un-/finishing a Task only works with valid parameters</td>
 <td class="success">assertTaskStateChangesOnlyAcceptsValidParameters()</td>
 <td class="success">0.002s</td>
@@ -121,7 +133,7 @@
 <input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
 </label>
 </div>Generated by 
-<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 19:35:34</p>
+<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 21:21:26</p>
 </div>
 </div>
 </body>
diff --git a/build/reports/tests/test/classes/hhn.temp.project.GoodCasesTest.html b/build/reports/tests/test/classes/hhn.temp.project.GoodCasesTest.html
index 226a822f..b25657ca 100644
--- a/build/reports/tests/test/classes/hhn.temp.project.GoodCasesTest.html
+++ b/build/reports/tests/test/classes/hhn.temp.project.GoodCasesTest.html
@@ -23,13 +23,13 @@
 <tr>
 <td>
 <div class="infoBox" id="tests">
-<div class="counter">7</div>
+<div class="counter">13</div>
 <p>tests</p>
 </div>
 </td>
 <td>
 <div class="infoBox" id="failures">
-<div class="counter">0</div>
+<div class="counter">2</div>
 <p>failures</p>
 </div>
 </td>
@@ -41,7 +41,7 @@
 </td>
 <td>
 <div class="infoBox" id="duration">
-<div class="counter">0.007s</div>
+<div class="counter">0.029s</div>
 <p>duration</p>
 </div>
 </td>
@@ -50,8 +50,8 @@
 </div>
 </td>
 <td>
-<div class="infoBox success" id="successRate">
-<div class="percent">100%</div>
+<div class="infoBox failures" id="successRate">
+<div class="percent">84%</div>
 <p>successful</p>
 </div>
 </td>
@@ -61,10 +61,50 @@
 <div class="tab-container">
 <ul class="tabLinks">
 <li>
+<a href="#">Failed tests</a>
+</li>
+<li>
 <a href="#">Tests</a>
 </li>
 </ul>
 <div class="tab">
+<h2>Failed tests</h2>
+<div class="test">
+<a name="assertEditingTasksIsPossibleThroughUi()"></a>
+<h3 class="failures">Check that editing is possible through UI</h3>
+<span class="code">
+<pre>org.opentest4j.AssertionFailedError: expected: &lt;Walk&gt; but was: &lt;Run&gt;
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
+	at app//org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
+	at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
+	at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
+	at app//org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1141)
+	at app//hhn.temp.project.GoodCasesTest.assertEditingTasksIsPossibleThroughUi(GoodCasesTest.java:133)
+	at java.base@17.0.2/java.lang.reflect.Method.invoke(Method.java:568)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+</pre>
+</span>
+</div>
+<div class="test">
+<a name="assertRemoveWorkerActuallyRemoves()"></a>
+<h3 class="failures">Assert that removing a worker removes the worker from the worker list</h3>
+<span class="code">
+<pre>org.opentest4j.AssertionFailedError: Expected java.lang.IllegalArgumentException to be thrown, but nothing was thrown.
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:152)
+	at app//org.junit.jupiter.api.AssertThrows.assertThrows(AssertThrows.java:73)
+	at app//org.junit.jupiter.api.AssertThrows.assertThrows(AssertThrows.java:35)
+	at app//org.junit.jupiter.api.Assertions.assertThrows(Assertions.java:3111)
+	at app//hhn.temp.project.GoodCasesTest.assertRemoveWorkerActuallyRemoves(GoodCasesTest.java:153)
+	at java.base@17.0.2/java.lang.reflect.Method.invoke(Method.java:568)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+</pre>
+</span>
+</div>
+</div>
+<div class="tab">
 <h2>Tests</h2>
 <table>
 <thead>
@@ -76,15 +116,33 @@
 </tr>
 </thead>
 <tr>
+<td class="success">Check that every required surface command actually works</td>
+<td class="success">assertCommandsAreRecognized()</td>
+<td class="success">0.003s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
 <td class="success">Assert deleted Tasks no longer show up in the List</td>
 <td class="success">assertDeletedTasksDisappear()</td>
-<td class="success">0s</td>
+<td class="success">0.002s</td>
 <td class="success">passed</td>
 </tr>
 <tr>
+<td class="failures">Check that editing is possible through UI</td>
+<td class="failures">assertEditingTasksIsPossibleThroughUi()</td>
+<td class="failures">0.005s</td>
+<td class="failures">failed</td>
+</tr>
+<tr>
 <td class="success">Assert existing Tasks can be edited</td>
 <td class="success">assertExistingTasksCanBeEdited()</td>
-<td class="success">0s</td>
+<td class="success">0.001s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">Check that every task command works</td>
+<td class="success">assertFinishingTasksIsPossibleThroughUi()</td>
+<td class="success">0.004s</td>
 <td class="success">passed</td>
 </tr>
 <tr>
@@ -94,6 +152,24 @@
 <td class="success">passed</td>
 </tr>
 <tr>
+<td class="failures">Assert that removing a worker removes the worker from the worker list</td>
+<td class="failures">assertRemoveWorkerActuallyRemoves()</td>
+<td class="failures">0.004s</td>
+<td class="failures">failed</td>
+</tr>
+<tr>
+<td class="success">Assert that removing Workers is possible through the UI</td>
+<td class="success">assertRemovingWorkersIsPossibleThroughUI()</td>
+<td class="success">0.002s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">Assert that the Scanner is actually started when AM calls start</td>
+<td class="success">assertScannerExists()</td>
+<td class="success">0.001s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
 <td class="success">Assert that Task State is actually changed when submitted as finished</td>
 <td class="success">assertTaskStateChanges()</td>
 <td class="success">0.002s</td>
@@ -127,7 +203,7 @@
 <input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
 </label>
 </div>Generated by 
-<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 19:35:34</p>
+<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 21:21:26</p>
 </div>
 </div>
 </body>
diff --git a/build/reports/tests/test/index.html b/build/reports/tests/test/index.html
index 2d9cc44d..ccfeb045 100644
--- a/build/reports/tests/test/index.html
+++ b/build/reports/tests/test/index.html
@@ -20,13 +20,13 @@
 <tr>
 <td>
 <div class="infoBox" id="tests">
-<div class="counter">13</div>
+<div class="counter">25</div>
 <p>tests</p>
 </div>
 </td>
 <td>
 <div class="infoBox" id="failures">
-<div class="counter">0</div>
+<div class="counter">3</div>
 <p>failures</p>
 </div>
 </td>
@@ -38,7 +38,7 @@
 </td>
 <td>
 <div class="infoBox" id="duration">
-<div class="counter">0.064s</div>
+<div class="counter">0.890s</div>
 <p>duration</p>
 </div>
 </td>
@@ -47,8 +47,8 @@
 </div>
 </td>
 <td>
-<div class="infoBox success" id="successRate">
-<div class="percent">100%</div>
+<div class="infoBox failures" id="successRate">
+<div class="percent">88%</div>
 <p>successful</p>
 </div>
 </td>
@@ -58,6 +58,9 @@
 <div class="tab-container">
 <ul class="tabLinks">
 <li>
+<a href="#">Failed tests</a>
+</li>
+<li>
 <a href="#">Packages</a>
 </li>
 <li>
@@ -65,6 +68,23 @@
 </li>
 </ul>
 <div class="tab">
+<h2>Failed tests</h2>
+<ul class="linkList">
+<li>
+<a href="classes/hhn.temp.project.DatabaseBadCasesTest.html">DatabaseBadCasesTest</a>.
+<a href="classes/hhn.temp.project.DatabaseBadCasesTest.html#assertConnectionFailed()">Assert connection failed</a>
+</li>
+<li>
+<a href="classes/hhn.temp.project.GoodCasesTest.html">GoodCasesTest</a>.
+<a href="classes/hhn.temp.project.GoodCasesTest.html#assertEditingTasksIsPossibleThroughUi()">Check that editing is possible through UI</a>
+</li>
+<li>
+<a href="classes/hhn.temp.project.GoodCasesTest.html">GoodCasesTest</a>.
+<a href="classes/hhn.temp.project.GoodCasesTest.html#assertRemoveWorkerActuallyRemoves()">Assert that removing a worker removes the worker from the worker list</a>
+</li>
+</ul>
+</div>
+<div class="tab">
 <h2>Packages</h2>
 <table>
 <thead>
@@ -79,14 +99,14 @@
 </thead>
 <tbody>
 <tr>
-<td class="success">
+<td class="failures">
 <a href="packages/hhn.temp.project.html">hhn.temp.project</a>
 </td>
-<td>13</td>
+<td>25</td>
+<td>3</td>
 <td>0</td>
-<td>0</td>
-<td>0.064s</td>
-<td class="success">100%</td>
+<td>0.890s</td>
+<td class="failures">88%</td>
 </tr>
 </tbody>
 </table>
@@ -109,21 +129,41 @@
 <td class="success">
 <a href="classes/hhn.temp.project.BadCasesTest.html">hhn.temp.project.BadCasesTest</a>
 </td>
-<td>6</td>
+<td>8</td>
 <td>0</td>
 <td>0</td>
-<td>0.057s</td>
+<td>0.048s</td>
 <td class="success">100%</td>
 </tr>
 <tr>
+<td class="failures">
+<a href="classes/hhn.temp.project.DatabaseBadCasesTest.html">hhn.temp.project.DatabaseBadCasesTest</a>
+</td>
+<td>1</td>
+<td>1</td>
+<td>0</td>
+<td>0.608s</td>
+<td class="failures">0%</td>
+</tr>
+<tr>
 <td class="success">
+<a href="classes/hhn.temp.project.DatabaseGoodCasesTest.html">hhn.temp.project.DatabaseGoodCasesTest</a>
+</td>
+<td>3</td>
+<td>0</td>
+<td>0</td>
+<td>0.205s</td>
+<td class="success">100%</td>
+</tr>
+<tr>
+<td class="failures">
 <a href="classes/hhn.temp.project.GoodCasesTest.html">hhn.temp.project.GoodCasesTest</a>
 </td>
-<td>7</td>
+<td>13</td>
+<td>2</td>
 <td>0</td>
-<td>0</td>
-<td>0.007s</td>
-<td class="success">100%</td>
+<td>0.029s</td>
+<td class="failures">84%</td>
 </tr>
 </tbody>
 </table>
@@ -136,7 +176,7 @@
 <input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
 </label>
 </div>Generated by 
-<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 19:35:34</p>
+<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 21:21:26</p>
 </div>
 </div>
 </body>
diff --git a/build/reports/tests/test/packages/hhn.temp.project.html b/build/reports/tests/test/packages/hhn.temp.project.html
index f902adb1..817f5d7c 100644
--- a/build/reports/tests/test/packages/hhn.temp.project.html
+++ b/build/reports/tests/test/packages/hhn.temp.project.html
@@ -22,13 +22,13 @@
 <tr>
 <td>
 <div class="infoBox" id="tests">
-<div class="counter">13</div>
+<div class="counter">25</div>
 <p>tests</p>
 </div>
 </td>
 <td>
 <div class="infoBox" id="failures">
-<div class="counter">0</div>
+<div class="counter">3</div>
 <p>failures</p>
 </div>
 </td>
@@ -40,7 +40,7 @@
 </td>
 <td>
 <div class="infoBox" id="duration">
-<div class="counter">0.064s</div>
+<div class="counter">0.890s</div>
 <p>duration</p>
 </div>
 </td>
@@ -49,8 +49,8 @@
 </div>
 </td>
 <td>
-<div class="infoBox success" id="successRate">
-<div class="percent">100%</div>
+<div class="infoBox failures" id="successRate">
+<div class="percent">88%</div>
 <p>successful</p>
 </div>
 </td>
@@ -60,10 +60,30 @@
 <div class="tab-container">
 <ul class="tabLinks">
 <li>
+<a href="#">Failed tests</a>
+</li>
+<li>
 <a href="#">Classes</a>
 </li>
 </ul>
 <div class="tab">
+<h2>Failed tests</h2>
+<ul class="linkList">
+<li>
+<a href="../classes/hhn.temp.project.DatabaseBadCasesTest.html">DatabaseBadCasesTest</a>.
+<a href="../classes/hhn.temp.project.DatabaseBadCasesTest.html#assertConnectionFailed()">Assert connection failed</a>
+</li>
+<li>
+<a href="../classes/hhn.temp.project.GoodCasesTest.html">GoodCasesTest</a>.
+<a href="../classes/hhn.temp.project.GoodCasesTest.html#assertEditingTasksIsPossibleThroughUi()">Check that editing is possible through UI</a>
+</li>
+<li>
+<a href="../classes/hhn.temp.project.GoodCasesTest.html">GoodCasesTest</a>.
+<a href="../classes/hhn.temp.project.GoodCasesTest.html#assertRemoveWorkerActuallyRemoves()">Assert that removing a worker removes the worker from the worker list</a>
+</li>
+</ul>
+</div>
+<div class="tab">
 <h2>Classes</h2>
 <table>
 <thead>
@@ -80,21 +100,41 @@
 <td class="success">
 <a href="../classes/hhn.temp.project.BadCasesTest.html">BadCasesTest</a>
 </td>
-<td>6</td>
+<td>8</td>
 <td>0</td>
 <td>0</td>
-<td>0.057s</td>
+<td>0.048s</td>
 <td class="success">100%</td>
 </tr>
 <tr>
+<td class="failures">
+<a href="../classes/hhn.temp.project.DatabaseBadCasesTest.html">DatabaseBadCasesTest</a>
+</td>
+<td>1</td>
+<td>1</td>
+<td>0</td>
+<td>0.608s</td>
+<td class="failures">0%</td>
+</tr>
+<tr>
 <td class="success">
+<a href="../classes/hhn.temp.project.DatabaseGoodCasesTest.html">DatabaseGoodCasesTest</a>
+</td>
+<td>3</td>
+<td>0</td>
+<td>0</td>
+<td>0.205s</td>
+<td class="success">100%</td>
+</tr>
+<tr>
+<td class="failures">
 <a href="../classes/hhn.temp.project.GoodCasesTest.html">GoodCasesTest</a>
 </td>
-<td>7</td>
+<td>13</td>
+<td>2</td>
 <td>0</td>
-<td>0</td>
-<td>0.007s</td>
-<td class="success">100%</td>
+<td>0.029s</td>
+<td class="failures">84%</td>
 </tr>
 </table>
 </div>
@@ -106,7 +146,7 @@
 <input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
 </label>
 </div>Generated by 
-<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 19:35:34</p>
+<a href="https://www.gradle.org">Gradle 8.14</a> at 03.12.2025, 21:21:26</p>
 </div>
 </div>
 </body>
diff --git a/build/test-results/test/TEST-hhn.temp.project.BadCasesTest.xml b/build/test-results/test/TEST-hhn.temp.project.BadCasesTest.xml
index 6d77e6ae..197b64c4 100644
--- a/build/test-results/test/TEST-hhn.temp.project.BadCasesTest.xml
+++ b/build/test-results/test/TEST-hhn.temp.project.BadCasesTest.xml
@@ -1,12 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="hhn.temp.project.BadCasesTest" tests="6" skipped="0" failures="0" errors="0" timestamp="2025-12-03T18:35:34.515Z" hostname="KEVIN-THINKPAD" time="0.067">
+<testsuite name="hhn.temp.project.BadCasesTest" tests="8" skipped="0" failures="0" errors="0" timestamp="2025-12-03T20:21:25.805Z" hostname="KEVIN-THINKPAD" time="0.059">
   <properties/>
-  <testcase name="Assert List isn't empty after adding a task" classname="hhn.temp.project.BadCasesTest" time="0.046"/>
+  <testcase name="Assert List isn't empty after adding a task" classname="hhn.temp.project.BadCasesTest" time="0.034"/>
+  <testcase name="Assert non-existent commands are recognized as such" classname="hhn.temp.project.BadCasesTest" time="0.001"/>
   <testcase name="Assert that Remove Task is programmed defensively" classname="hhn.temp.project.BadCasesTest" time="0.003"/>
-  <testcase name="Assert Add Task is programmed defensively" classname="hhn.temp.project.BadCasesTest" time="0.002"/>
+  <testcase name="Assert that removing a non-existent worker throws an Exception" classname="hhn.temp.project.BadCasesTest" time="0.002"/>
+  <testcase name="Assert Add Task is programmed defensively" classname="hhn.temp.project.BadCasesTest" time="0.003"/>
   <testcase name="Assert only existing tasks can be edited" classname="hhn.temp.project.BadCasesTest" time="0.002"/>
   <testcase name="Assert that un-/finishing a Task only works with valid parameters" classname="hhn.temp.project.BadCasesTest" time="0.002"/>
-  <testcase name="Assert that added tasks can't be Null" classname="hhn.temp.project.BadCasesTest" time="0.002"/>
+  <testcase name="Assert that added tasks can't be Null" classname="hhn.temp.project.BadCasesTest" time="0.001"/>
   <system-out><![CDATA[]]></system-out>
   <system-err><![CDATA[]]></system-err>
 </testsuite>
diff --git a/build/test-results/test/TEST-hhn.temp.project.GoodCasesTest.xml b/build/test-results/test/TEST-hhn.temp.project.GoodCasesTest.xml
index f0783ce3..0fe4f175 100644
--- a/build/test-results/test/TEST-hhn.temp.project.GoodCasesTest.xml
+++ b/build/test-results/test/TEST-hhn.temp.project.GoodCasesTest.xml
@@ -1,13 +1,43 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="hhn.temp.project.GoodCasesTest" tests="7" skipped="0" failures="0" errors="0" timestamp="2025-12-03T18:35:34.587Z" hostname="KEVIN-THINKPAD" time="0.013">
+<testsuite name="hhn.temp.project.GoodCasesTest" tests="13" skipped="0" failures="2" errors="0" timestamp="2025-12-03T20:21:26.480Z" hostname="KEVIN-THINKPAD" time="0.043">
   <properties/>
   <testcase name="Check Getters" classname="hhn.temp.project.GoodCasesTest" time="0.003"/>
+  <testcase name="Check that editing is possible through UI" classname="hhn.temp.project.GoodCasesTest" time="0.005">
+    <failure message="org.opentest4j.AssertionFailedError: expected: &lt;Walk&gt; but was: &lt;Run&gt;" type="org.opentest4j.AssertionFailedError">org.opentest4j.AssertionFailedError: expected: &lt;Walk&gt; but was: &lt;Run&gt;
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
+	at app//org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
+	at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
+	at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
+	at app//org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1141)
+	at app//hhn.temp.project.GoodCasesTest.assertEditingTasksIsPossibleThroughUi(GoodCasesTest.java:133)
+	at java.base@17.0.2/java.lang.reflect.Method.invoke(Method.java:568)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+</failure>
+  </testcase>
+  <testcase name="Check that every required surface command actually works" classname="hhn.temp.project.GoodCasesTest" time="0.003"/>
   <testcase name="Assert that added Tasks are added to the List" classname="hhn.temp.project.GoodCasesTest" time="0.001"/>
   <testcase name="Assert that Worker can remove Task" classname="hhn.temp.project.GoodCasesTest" time="0.0"/>
+  <testcase name="Check that every task command works" classname="hhn.temp.project.GoodCasesTest" time="0.004"/>
   <testcase name="Assert that a Worker can add a Task" classname="hhn.temp.project.GoodCasesTest" time="0.001"/>
-  <testcase name="Assert existing Tasks can be edited" classname="hhn.temp.project.GoodCasesTest" time="0.0"/>
+  <testcase name="Assert that removing Workers is possible through the UI" classname="hhn.temp.project.GoodCasesTest" time="0.002"/>
+  <testcase name="Assert existing Tasks can be edited" classname="hhn.temp.project.GoodCasesTest" time="0.001"/>
+  <testcase name="Assert that removing a worker removes the worker from the worker list" classname="hhn.temp.project.GoodCasesTest" time="0.004">
+    <failure message="org.opentest4j.AssertionFailedError: Expected java.lang.IllegalArgumentException to be thrown, but nothing was thrown." type="org.opentest4j.AssertionFailedError">org.opentest4j.AssertionFailedError: Expected java.lang.IllegalArgumentException to be thrown, but nothing was thrown.
+	at app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:152)
+	at app//org.junit.jupiter.api.AssertThrows.assertThrows(AssertThrows.java:73)
+	at app//org.junit.jupiter.api.AssertThrows.assertThrows(AssertThrows.java:35)
+	at app//org.junit.jupiter.api.Assertions.assertThrows(Assertions.java:3111)
+	at app//hhn.temp.project.GoodCasesTest.assertRemoveWorkerActuallyRemoves(GoodCasesTest.java:153)
+	at java.base@17.0.2/java.lang.reflect.Method.invoke(Method.java:568)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+	at java.base@17.0.2/java.util.ArrayList.forEach(ArrayList.java:1511)
+</failure>
+  </testcase>
+  <testcase name="Assert that the Scanner is actually started when AM calls start" classname="hhn.temp.project.GoodCasesTest" time="0.001"/>
   <testcase name="Assert that Task State is actually changed when submitted as finished" classname="hhn.temp.project.GoodCasesTest" time="0.002"/>
-  <testcase name="Assert deleted Tasks no longer show up in the List" classname="hhn.temp.project.GoodCasesTest" time="0.0"/>
+  <testcase name="Assert deleted Tasks no longer show up in the List" classname="hhn.temp.project.GoodCasesTest" time="0.002"/>
   <system-out><![CDATA[]]></system-out>
   <system-err><![CDATA[]]></system-err>
 </testsuite>
diff --git a/build/test-results/test/binary/results.bin b/build/test-results/test/binary/results.bin
index 7aff7fb4..473422cd 100644
Binary files a/build/test-results/test/binary/results.bin and b/build/test-results/test/binary/results.bin differ
diff --git a/build/tmp/compileJava/compileTransaction/stash-dir/AssignmentManager.class.uniqueId0 b/build/tmp/compileJava/compileTransaction/stash-dir/AssignmentManager.class.uniqueId0
deleted file mode 100644
index 1e2b98f2..00000000
Binary files a/build/tmp/compileJava/compileTransaction/stash-dir/AssignmentManager.class.uniqueId0 and /dev/null differ
diff --git a/build/tmp/compileJava/compileTransaction/stash-dir/Task.class.uniqueId1 b/build/tmp/compileJava/compileTransaction/stash-dir/Task.class.uniqueId1
deleted file mode 100644
index 41957b7b..00000000
Binary files a/build/tmp/compileJava/compileTransaction/stash-dir/Task.class.uniqueId1 and /dev/null differ
diff --git a/build/tmp/compileJava/previous-compilation-data.bin b/build/tmp/compileJava/previous-compilation-data.bin
index 18ca8e68..24d0e1f0 100644
Binary files a/build/tmp/compileJava/previous-compilation-data.bin and b/build/tmp/compileJava/previous-compilation-data.bin differ
diff --git a/build/tmp/compileTestJava/previous-compilation-data.bin b/build/tmp/compileTestJava/previous-compilation-data.bin
index d7e76392..a815bdf2 100644
Binary files a/build/tmp/compileTestJava/previous-compilation-data.bin and b/build/tmp/compileTestJava/previous-compilation-data.bin differ
diff --git a/src/main/java/hhn/temp/project/AssignmentManager.java b/src/main/java/hhn/temp/project/AssignmentManager.java
index eca8d408..ed41652a 100644
--- a/src/main/java/hhn/temp/project/AssignmentManager.java
+++ b/src/main/java/hhn/temp/project/AssignmentManager.java
@@ -27,6 +27,9 @@ public class AssignmentManager {
         return workerIdCounter;
     }
     public void removeWorker(int workerId) {
+        if (!workerMap.containsKey(workerId)) {
+            throw new IllegalArgumentException("WorkerId must exist in order to remove it");
+        }
         workerMap.remove(workerId);
     }
     public int addTask(int workerId, String name, String description) {
@@ -74,5 +77,8 @@ public class AssignmentManager {
         Task task = taskMap.get(taskId);
         task.setTaskState(TaskState.IN_PROGRESS);
     }
+    public UserCommands getUserCommands() {
+        return userInterface;
+    }
 
 }
diff --git a/src/main/java/hhn/temp/project/UserCommands.java b/src/main/java/hhn/temp/project/UserCommands.java
index 70f25b2d..c9abdf06 100644
--- a/src/main/java/hhn/temp/project/UserCommands.java
+++ b/src/main/java/hhn/temp/project/UserCommands.java
@@ -3,18 +3,22 @@ package hhn.temp.project;
 import java.util.Scanner;
 
 public class UserCommands {
+    Scanner scanner;
     public void start() {
         boolean close = false;
-        Scanner scanner = new Scanner(System.in);
-        while (!close) {
-            System.out.println("Type '?' or 'help' for a list of commands");
-            System.out.println("Please enter a command:");
-            String input = scanner.nextLine();
-            handleInput(input);
-        }
-        scanner.close();
+//        scanner = new Scanner(System.in);
+//        while (!close) {
+//            System.out.println("Type '?' or 'help' for a list of commands");
+//            System.out.println("Please enter a command:");
+//            String input = scanner.nextLine();
+//            handleInput(input);
+//        }
+//        scanner.close();
     }
     public void handleInput(String input) {
 
     }
+    public Scanner getScanner() {
+        return scanner;
+    }
 }
diff --git a/test/hhn/temp/project/GoodCasesTest.java b/test/hhn/temp/project/GoodCasesTest.java
index 0fc849e7..e7549c99 100644
--- a/test/hhn/temp/project/GoodCasesTest.java
+++ b/test/hhn/temp/project/GoodCasesTest.java
@@ -4,6 +4,8 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
+import java.util.Scanner;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 public class GoodCasesTest {
@@ -90,7 +92,7 @@ public class GoodCasesTest {
     @DisplayName("Assert that the Scanner is actually started when AM calls start")
     public void assertScannerExists() {
         try {
-            manager.getUserCommands().getScanner();
+            Scanner scanner = manager.getUserCommands().getScanner();
         } catch (Exception e) {
             fail("Scanner does not exists or can't be gotten by getScanner()");
         }
@@ -112,7 +114,7 @@ public class GoodCasesTest {
         int workerId = manager.createWorker("Alfred");
         int taskId = manager.addTask(workerId, "Run", "Jog 10 Miles");
         manager.getUserCommands().handleInput("selectTask");
-        assertDoesNotThrow(() -> manager.getUserCommands().handleInput(taskId));
+        assertDoesNotThrow(() -> manager.getUserCommands().handleInput(taskId + ""));
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("finish"));
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("unfinish"));
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("remove"));
@@ -125,7 +127,7 @@ public class GoodCasesTest {
         int workerId = manager.createWorker("Alfred");
         int taskId = manager.addTask(workerId, "Run", "Jog 10 Miles");
         manager.getUserCommands().handleInput("selectTask");
-        manager.getUserCommands().handleInput(taskId);
+        manager.getUserCommands().handleInput(taskId + "");
         manager.getUserCommands().handleInput("edit");
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("Walk;Walk 3 Miles"));
         assertEquals("Walk", manager.getTask(taskId).getName());
@@ -138,9 +140,9 @@ public class GoodCasesTest {
         int workerId = manager.createWorker("Alfred");
         int workerId2 = manager.createWorker("Balfred");
         manager.getUserCommands().handleInput("listWorkers");
-        manager.getUserCommands().handleInput(workerId);
+        manager.getUserCommands().handleInput(workerId + "");
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("remove"));
-        manager.getUserCommands().handleInput(workerId2);
+        manager.getUserCommands().handleInput(workerId2 + "");
         assertDoesNotThrow(() -> manager.getUserCommands().handleInput("back"));
     }
     @Test