diff --git a/tests/webfiori/framework/test/cli/SchedulerCommandTest.php b/tests/webfiori/framework/test/cli/SchedulerCommandTest.php
index 605c1bd3..506289db 100644
--- a/tests/webfiori/framework/test/cli/SchedulerCommandTest.php
+++ b/tests/webfiori/framework/test/cli/SchedulerCommandTest.php
@@ -173,8 +173,8 @@ public function test05() {
             "Line: 44\n",
             "Stack Trace:\n",
             "#0 At class app\\tasks\Fail2TestTask line 44\n",
-            "#1 At class webfiori\\framework\scheduler\AbstractTask line 1097\n",
-            "#2 At class webfiori\\framework\scheduler\AbstractTask line 418\n",
+            "#1 At class webfiori\\framework\scheduler\AbstractTask line 1101\n",
+            "#2 At class webfiori\\framework\scheduler\AbstractTask line 422\n",
             "#3 At class webfiori\\framework\scheduler\AbstractTask line 951\n",
             "#4 At class webfiori\\framework\scheduler\TasksManager line 673\n",
             "#5 At class webfiori\\framework\scheduler\TasksManager line 139\n",
diff --git a/tests/webfiori/framework/test/cli/UpdateSettingsCommandTest.php b/tests/webfiori/framework/test/cli/UpdateSettingsCommandTest.php
index 3cc422cb..8b9796b9 100644
--- a/tests/webfiori/framework/test/cli/UpdateSettingsCommandTest.php
+++ b/tests/webfiori/framework/test/cli/UpdateSettingsCommandTest.php
@@ -315,7 +315,56 @@ public function testUpdatePrimaryTheme01() {
 
         $this->assertEquals('themes\\fioriTheme2\\NewTestTheme2', App::getConfig()->getTheme());
     }
+    /**
+     * @test
+     */
+    public function testUpdatePrimaryTheme02() {
+        $runner = App::getRunner();
+        $runner->setInputs([
+            'webfiori\\framework\\Privilege',
+            'themes\\fioriTheme2\\NewTestTheme2'
+        ]);
+        $runner->setArgsVector([
+            'webfiori',
+            'update-settings',
+            '--w' => 'theme'
+        ]);
+        $runner->start();
+        //$this->assertEquals(0, $runner->start());
+        $this->assertEquals([
+            "Enter theme class name with namespace:\n",
+            "Error: Invalid input is given. Try again.\n",
+            "Enter theme class name with namespace:\n",
+            "Success: Theme successfully updated.\n"
+        ], $runner->getOutput());
 
+        $this->assertEquals('themes\\fioriTheme2\\NewTestTheme2', App::getConfig()->getTheme());
+    }
+    /**
+     * @test
+     */
+    public function testUpdatePrimaryTheme03() {
+        $runner = App::getRunner();
+        $runner->setInputs([
+            'webfiori\\framework\\App',
+            'themes\\fioriTheme2\\NewTestTheme2'
+        ]);
+        $runner->setArgsVector([
+            'webfiori',
+            'update-settings',
+            '--w' => 'theme'
+        ]);
+        $runner->start();
+        //$this->assertEquals(0, $runner->start());
+        $this->assertEquals([
+            "Enter theme class name with namespace:\n",
+            "Error: Invalid input is given. Try again.\n",
+            "Enter theme class name with namespace:\n",
+            "Success: Theme successfully updated.\n"
+        ], $runner->getOutput());
+
+        $this->assertEquals('themes\\fioriTheme2\\NewTestTheme2', App::getConfig()->getTheme());
+    }
     /**
      * @test
      */
diff --git a/tests/webfiori/framework/test/config/JsonDriverTest.php b/tests/webfiori/framework/test/config/JsonDriverTest.php
index 2101f70f..f703829a 100644
--- a/tests/webfiori/framework/test/config/JsonDriverTest.php
+++ b/tests/webfiori/framework/test/config/JsonDriverTest.php
@@ -142,6 +142,7 @@ public function testAddEnvVar00() {
         $driver->addEnvVar('COOL_OR_NOT', 'cool');
         $driver->addEnvVar('DO_IT', false);
         $driver->addEnvVar('MULTIPLY_BY', 4, 'A number to multiply by.');
+        $driver->addEnvVar('NUL');
     }
     /**
      * @test
@@ -171,6 +172,10 @@ public function testAddEnvVar01() {
                 "value" => 4,
                 "description" => "A number to multiply by."
             ],
+            'NUL' => [
+                "value" => null,
+                "description" => null
+            ]
         ], $driver->getEnvVars());
         $driver->removeEnvVar('COOL_OR_NOT');
     }
@@ -198,6 +203,10 @@ public function testAddEnvVar02() {
                 "value" => 4,
                 "description" => "A number to multiply by."
             ],
+            'NUL' => [
+                "value" => null,
+                "description" => null
+            ]
         ], $driver->getEnvVars());
     }
     /**
@@ -409,6 +418,7 @@ public function testDatabaseConnections00() {
         $conn = new ConnectionInfo('mysql', 'root', 'test@222', 'my_db', 'localhost', 3306);
         $driver->addOrUpdateDBConnection($conn);
         $this->assertEquals(1, count($driver->getDBConnections()));
+        
     }
     /**
      * @test
@@ -417,14 +427,42 @@ public function testDatabaseConnections00() {
     public function testDatabaseConnections01() {
         $driver = new JsonDriver();
         $driver->initialize();
-        $account =$driver->getDBConnection('New_Connection');
+        $account = $driver->getDBConnection('New_Connection');
         $this->assertEquals(3306, $account->getPort());
         $this->assertEquals('my_db', $account->getDBName());
         $this->assertEquals('mysql', $account->getDatabaseType());
         $this->assertEquals('localhost', $account->getHost());
         $this->assertEquals('test@222', $account->getPassword());
         $this->assertEquals('root', $account->getUsername());
-
+        $driver->removeAllDBConnections();
+        $this->assertEquals(0, count($driver->getDBConnections()));
+        $this->assertNull($driver->getDBConnection('New_Connection'));
+    }
+    /**
+     * @test
+     * @depends testDatabaseConnections01
+     */
+    public function testDatabaseConnections02() {
+        $driver = new JsonDriver();
+        $this->assertEquals(0, count($driver->getDBConnections()));
+        $this->assertNull($driver->getDBConnection('olf'));
+        $conn = new ConnectionInfo('mysql', 'root', 'test@222', 'my_db', 'localhost', 3306, [
+            'KG' => 9,
+            'OP' => 'hello'
+        ]);
+        $driver->addOrUpdateDBConnection($conn);
+        $this->assertEquals(1, count($driver->getDBConnections()));
+        $account = $driver->getDBConnection('New_Connection');
+        $this->assertEquals(3306, $account->getPort());
+        $this->assertEquals('my_db', $account->getDBName());
+        $this->assertEquals('mysql', $account->getDatabaseType());
+        $this->assertEquals('localhost', $account->getHost());
+        $this->assertEquals('test@222', $account->getPassword());
+        $this->assertEquals('root', $account->getUsername());
+        $this->assertEquals([
+            'KG' => 9,
+            'OP' => 'hello'
+        ], $account->getExtars());
     }
     /**
      * @test
diff --git a/tests/webfiori/framework/test/scheduler/SchedulerTaskTest.php b/tests/webfiori/framework/test/scheduler/SchedulerTaskTest.php
index a8af8e48..e06af5c3 100644
--- a/tests/webfiori/framework/test/scheduler/SchedulerTaskTest.php
+++ b/tests/webfiori/framework/test/scheduler/SchedulerTaskTest.php
@@ -76,6 +76,15 @@ public function testAttributes05() {
      * @test
      */
     public function testAttributes06() {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage("Invalid argument type. Expected 'string' or 'webfiori\\framework\\scheduler\\TaskArgument'");
+        $job = new BaseTask();
+        $job->addExecutionArg(new \webfiori\framework\Privilege());
+    }
+    /**
+     * @test
+     */
+    public function testAttributes07() {
         $job = new BaseTask();
         $job->addExecutionArgs([
             'one' => [
diff --git a/tests/webfiori/framework/test/writers/CLICommandClassWriterTest.php b/tests/webfiori/framework/test/writers/CLICommandClassWriterTest.php
index 66b4b2a4..29e4ab50 100644
--- a/tests/webfiori/framework/test/writers/CLICommandClassWriterTest.php
+++ b/tests/webfiori/framework/test/writers/CLICommandClassWriterTest.php
@@ -67,4 +67,47 @@ public function test01() {
         $this->assertEquals('A do arg', $arg->getDescription());
         $this->assertTrue($arg->isOptional());
     }
+    /**
+     * @test
+     */
+    public function test02() {
+        $writer = new CLICommandClassWriter();
+        $this->assertFalse($writer->setCommandName('invalid name'));
+        $this->assertFalse($writer->setCommandName('   '));
+        $this->assertTrue($writer->setCommandName('Lets-Do-It'));
+        $this->assertEquals('Lets-Do-It', $writer->getCommandName());
+        $this->assertFalse($writer->setClassName('Invalid Name'));
+        $this->assertFalse($writer->setClassName('   '));
+        $this->assertTrue($writer->setClassName('DoItX2Command'));
+        $this->assertEquals('DoItX2Command', $writer->getName());
+        $this->assertEquals(ROOT_PATH.DS.APP_DIR.DS.'commands'.DS.'DoItX2Command.php', $writer->getAbsolutePath());
+        $this->assertEquals('app\\commands', $writer->getNamespace());
+        $this->assertEquals('Lets-Do-It', $writer->getCommandName());
+        $this->assertEquals('', $writer->getDescription());
+        $this->assertEquals([], $writer->getArgs());
+        $writer->setArgs([
+            new \webfiori\cli\Argument('--do', 'A do arg', true)
+        ]);
+        $this->assertEquals('', $writer->getDescription());
+        $writer->setCommandDescription(' ');
+        $this->assertEquals('', $writer->getDescription());
+        $this->assertEquals([
+            'webfiori\cli\CLICommand'
+        ], $writer->getUseStatements());
+        $writer->writeClass();
+        $clazz = $writer->getNamespace().'\\'.$writer->getName();
+        $this->assertTrue(class_exists($clazz));
+        $writer->removeClass();
+        $clazzObj = new $clazz();
+        $this->assertTrue($clazzObj instanceof CLICommand);
+        $this->assertEquals('Lets-Do-It', $clazzObj->getName());
+        $this->assertEquals('<NO DESCRIPTION>', $clazzObj->getDescription());
+        $this->assertEquals([
+            '--do'
+        ], $clazzObj->getArgsNames());
+        $arg = $clazzObj->getArg('--do');
+        $this->assertTrue($arg instanceof \webfiori\cli\Argument);
+        $this->assertEquals('A do arg', $arg->getDescription());
+        $this->assertTrue($arg->isOptional());
+    }
 }
diff --git a/webfiori/framework/cli/commands/UpdateSettingsCommand.php b/webfiori/framework/cli/commands/UpdateSettingsCommand.php
index e6844bbc..dde9ee0b 100644
--- a/webfiori/framework/cli/commands/UpdateSettingsCommand.php
+++ b/webfiori/framework/cli/commands/UpdateSettingsCommand.php
@@ -104,6 +104,7 @@ private function getThemeNs() {
                 if ($instance instanceof Theme) {
                     return true;
                 }
+                return false;
             } catch (Throwable $exc) {
                 return false;
             }
diff --git a/webfiori/framework/config/ClassDriver.php b/webfiori/framework/config/ClassDriver.php
index 43b3209d..ca230c84 100644
--- a/webfiori/framework/config/ClassDriver.php
+++ b/webfiori/framework/config/ClassDriver.php
@@ -67,7 +67,7 @@ public static function a($file, $str, $tabSize = 0) {
      * @param string $description An optional description to describe the porpuse
      * of the constant.
      */
-    public function addEnvVar(string $name, $value, string $description = null) {
+    public function addEnvVar(string $name, $value = null, string $description = null) {
         $this->configVars['env-vars'][$name] = [
             'value' => $value,
             'description' => $description
diff --git a/webfiori/framework/config/ConfigurationDriver.php b/webfiori/framework/config/ConfigurationDriver.php
index 367eade9..d41af29a 100644
--- a/webfiori/framework/config/ConfigurationDriver.php
+++ b/webfiori/framework/config/ConfigurationDriver.php
@@ -18,15 +18,16 @@ interface ConfigurationDriver {
      * The variables which are added using this method will be defined as
      * a named constant at run time using the function 'define'. This means
      * the constant will be accesaable anywhere within the application's environment.
+     * Additionally, it will be added as environment variable using 'putenv()'.
      *
      * @param string $name The name of the named constant such as 'MY_CONSTANT'.
      *
-     * @param mixed $value The value of the constant.
+     * @param mixed|null $value The value of the constant.
      *
      * @param string $description An optional description to describe the porpuse
      * of the constant.
      */
-    public function addEnvVar(string $name, $value, string $description = null);
+    public function addEnvVar(string $name, $value = null, string $description = null);
     /**
      * Adds new database connections information or update existing connections.
      *
diff --git a/webfiori/framework/config/Controller.php b/webfiori/framework/config/Controller.php
index d338c95a..254dc4eb 100644
--- a/webfiori/framework/config/Controller.php
+++ b/webfiori/framework/config/Controller.php
@@ -22,6 +22,15 @@ public function __construct() {
         $this->driver = new $driverClazz();
         $this->driver->initialize();
     }
+    /**
+     * Adds new environment variable to the configuration of the app.
+     * 
+     * @param string $name The name of the variable such as 'MY_VAR'.
+     * 
+     * @param mixed $value The value of the variable.
+     * 
+     * @param string|null $description An optional text that describes the variable.
+     */
     public function addEnvVar(string $name, $value, string $description = null) {
         $this->getDriver()->addEnvVar($name, $value, $description);
     }
@@ -56,6 +65,7 @@ public function copy(ConfigurationDriver $new) {
         }
 
         foreach ($current->getEnvVars() as $name => $probs) {
+            
             $new->addEnvVar($name, $probs['value'], $probs['description']);
         }
         $new->setPrimaryLanguage($current->getPrimaryLanguage());
@@ -104,7 +114,13 @@ public static function setDriver(ConfigurationDriver $driver) {
     public static function updateEnv() {
         foreach (self::getDriver()->getEnvVars() as $name => $envVar) {
             if (!defined($name)) {
-                define($name, $envVar['value']);
+                if (isset($envVar['value'])) {
+                    define($name, $envVar['value']);
+                    putenv($name.'='.$envVar['value']);
+                } else {
+                    define($name, null);
+                    putenv($name.'=');
+                }
             }
         }
     }
diff --git a/webfiori/framework/config/JsonDriver.php b/webfiori/framework/config/JsonDriver.php
index 1b1c8d4a..6588baff 100644
--- a/webfiori/framework/config/JsonDriver.php
+++ b/webfiori/framework/config/JsonDriver.php
@@ -87,7 +87,7 @@ public function __construct() {
      * @param string $description An optional description to describe the porpuse
      * of the constant.
      */
-    public function addEnvVar(string $name, $value, string $description = null) {
+    public function addEnvVar(string $name, $value = null, string $description = null) {
         $this->json->get('env-vars')->add($name, new Json([
             'value' => $value,
             'description' => $description
@@ -193,6 +193,8 @@ public function getDBConnection(string $conName) {
                 foreach ($extras->getProperties() as $prop) {
                     $extrasArr[$prop->getName()] = $prop->getValue();
                 }
+            } else if (gettype($extras) == 'array') {
+                $extrasArr = $extras;
             }
 
             return new ConnectionInfo(
@@ -225,11 +227,16 @@ public function getDBConnections(): array {
                 $this->getProp($jsonObj, 'database', $name));
             $extrasObj = $jsonObj->get('extras');
 
-            if ($extrasObj !== null && $extrasObj instanceof Json) {
+            if ($extrasObj !== null) {
                 $extrasArr = [];
-
-                foreach ($extrasObj->getProperties() as $prop) {
-                    $extrasArr[$prop->getName()] = $prop->getValue();
+                if ($extrasObj instanceof Json) {
+                    
+
+                    foreach ($extrasObj->getProperties() as $prop) {
+                        $extrasArr[$prop->getName()] = $prop->getValue();
+                    }
+                } else if (gettype($extrasObj) == 'array') {
+                    $extrasArr = $extrasObj;
                 }
                 $acc->setExtras($extrasArr);
             }
@@ -262,7 +269,15 @@ public function getDescriptions(): array {
 
         return $retVal;
     }
-
+    /**
+     * Returns an array that holds the information of defined application environment
+     * variables.
+     * 
+     * @return array The returned array will be associative. The key will represent
+     * the name of the variable and its value is a sub-associative array with
+     * two indices, 'description' and 'value'. The description index is a text that describes
+     * the variable and the value index will hold its value.
+     */
     public function getEnvVars(): array {
         $retVal = [];
         $vars = $this->json->get('env-vars');
@@ -364,7 +379,12 @@ public function getSMTPConnections(): array {
 
         return $retVal;
     }
-
+    /**
+     * Returns the name or the namespace of default theme that the application
+     * will use in case a page does not have specific theme.
+     * 
+     * @return string
+     */
     public function getTheme(): string {
         return $this->json->get('theme') ?? '';
     }
diff --git a/webfiori/framework/scheduler/AbstractTask.php b/webfiori/framework/scheduler/AbstractTask.php
index 2f40a2ea..0e0af20e 100644
--- a/webfiori/framework/scheduler/AbstractTask.php
+++ b/webfiori/framework/scheduler/AbstractTask.php
@@ -11,6 +11,7 @@
 namespace webfiori\framework\scheduler;
 
 use Exception;
+use InvalidArgumentException;
 use Throwable;
 use webfiori\collections\Queue;
 use webfiori\error\TraceEntry;
@@ -205,6 +206,9 @@ public function __construct(string $taskName = '', string $when = '* * * * *', s
      *
      * @param string|TaskArgument $nameOrObj The name of the argument. This also can be an
      * object of type TaskArgument.
+     * 
+     * @throws InvalidArgumentException If provided argument is not a string or an object of type
+     * 'TaskArgument'.
      *
      * @since 1.0
      */
@@ -214,7 +218,7 @@ public function addExecutionArg($nameOrObj) {
         } else if ($nameOrObj instanceof TaskArgument) {
             $arg = $nameOrObj;
         } else {
-            return;
+            throw new InvalidArgumentException('Invalid argument type. Expected \'string\' or \''.TaskArgument::class.'\'');;
         }
 
         if (!$this->hasArg($arg->getName())) {
diff --git a/webfiori/framework/writers/CLICommandClassWriter.php b/webfiori/framework/writers/CLICommandClassWriter.php
index 511e9880..d233cfe4 100644
--- a/webfiori/framework/writers/CLICommandClassWriter.php
+++ b/webfiori/framework/writers/CLICommandClassWriter.php
@@ -94,7 +94,7 @@ public function setArgs(array $argsArr) {
     public function setCommandDescription(string $desc) {
         $trimmed = trim($desc);
 
-        if (strlen($desc) == 0) {
+        if (strlen($trimmed) == 0) {
             return;
         }
         $this->desc = $trimmed;