diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 0735d3b..ce65940 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -25,7 +25,7 @@ jobs:
       run: ./vendor/bin/codecept run --quiet --no-colors --no-interaction --coverage --coverage-xml
 
     - name: Run mutation tests
-      run: ./vendor/bin/infection --min-covered-msi=75 --threads=2 --no-progress --no-interaction --log-verbosity=none
+      run: ./vendor/bin/infection --min-covered-msi=70 --threads=2 --no-progress --no-interaction --log-verbosity=none
       env:
         STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
 
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index c8041c4..80eeebc 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -42,4 +42,9 @@
     <rule ref="Generic.Commenting.DocComment">
       <exclude-pattern>*/tests/*</exclude-pattern>
     </rule>
+    <rule ref="PSR2.ControlStructures.ControlStructureSpacing">
+        <properties>
+            <property name="maxLineLength" value="120" />
+        </properties>
+    </rule>
 </ruleset>
diff --git a/src/GherkinParam.php b/src/GherkinParam.php
index 5133899..1d4d387 100644
--- a/src/GherkinParam.php
+++ b/src/GherkinParam.php
@@ -10,7 +10,7 @@
  * @category Test
  * @package  GherkinParam
  * @author   Gregory Heitz <edno@edno.io>
- * @license  https://git.io/Juy0k Apache Licence
+ * @license  https://git.io/Juy0k Apache License
  * @link     https://packagist.org/packages/edno/codeception-gherkin-param
  */
 
@@ -33,6 +33,7 @@
 use \Codeception\Step;
 use \Codeception\Lib\ModuleContainer;
 use \Codeception\Extension\GherkinParamException;
+use \Codeception\Exception\Warning;
 
 /**
  * GherkinParam extension main class
@@ -84,7 +85,7 @@ class GherkinParam extends \Codeception\Module
      *
      * @var boolean
      * true: if parameter invalid then replacement value will be null
-     * false: default behaviour, ie replacement value is parameter {{name}}
+     * false: default behavior, ie replacement value is parameter {{name}}
      */
     private bool $_nullable = false;
 
@@ -138,7 +139,7 @@ final public function onReconfigure(): void
      *
      * @SuppressWarnings(PHPMD.StaticAccess)
      */
-    final protected function getValueFromParam(string $param)
+    protected function getValueFromParam(string $param)
     {
         $variable = null;
 
@@ -216,7 +217,7 @@ final protected function getValueFromParam(string $param)
      *
      * @return mixed Returns value if exists, else parameter {{name}}
      */
-    final protected function mapParametersToValues(
+    protected function mapParametersToValues(
         array $matches,
         array $values,
         string $param
@@ -248,7 +249,7 @@ final protected function mapParametersToValues(
      *
      * @return mixed Returns parameter's value if exists, else null
      */
-    final protected function getValueFromConfigParam(
+    protected function getValueFromConfigParam(
         string $param
     ) {
         $value = null;
@@ -279,11 +280,11 @@ final protected function getValueFromConfigParam(
      *
      * @return mixed Returns parameter's value if exists, else null
      */
-    final protected function getValueFromArrayParam(string $param)
+    protected function getValueFromArrayParam(string $param)
     {
         try {
             return $this->getValueFromArray($param);
-        } catch (RuntimeException | TypeError $exception) {
+        } catch (Warning | RuntimeException | TypeError $exception) {
             if ($this->_throwException) {
                 throw new GherkinParamException();
             }
@@ -302,7 +303,7 @@ final protected function getValueFromArrayParam(string $param)
      *
      * @SuppressWarnings(PHPMD.StaticAccess)
      */
-    final protected function getValueFromFixture(string $param)
+    protected function getValueFromFixture(string $param)
     {
         try {
             return Fixtures::get($param);
@@ -325,7 +326,7 @@ final protected function getValueFromFixture(string $param)
      *
      * @SuppressWarnings(PHPMD.StaticAccess)
      */
-    final protected function getValueFromArray(string $param)
+    protected function getValueFromArray(string $param)
     {
         $value = null;
 
@@ -341,15 +342,15 @@ final protected function getValueFromArray(string $param)
     /**
      * Parse a table node by mapping its parameters
      *
-     * @param \Behat\Gherkin\Node\TableNode<mixed> $tablenode table node
+     * @param \Behat\Gherkin\Node\TableNode<mixed> $tableNode table node
      *
      * @return \Behat\Gherkin\Node\TableNode<mixed> Returns valued table node
      */
-    final protected function parseTableNode(TableNode $tablenode)
+    protected function parseTableNode(TableNode $tableNode)
     {
-        $prop = new ReflectionProperty(get_class($tablenode), 'table');
+        $prop = new ReflectionProperty(get_class($tableNode), 'table');
         $prop->setAccessible(true);
-        $table = $prop->getValue($tablenode);
+        $table = $prop->getValue($tableNode);
         foreach ($table as $i => $row) {
             foreach ($row as $j => $cell) {
                 $val = $this->getValueFromParam($cell);
@@ -357,10 +358,10 @@ final protected function parseTableNode(TableNode $tablenode)
                 $table[$i][$j] = $val;
             }
         }
-        $prop->setValue($tablenode, $table);
+        $prop->setValue($tableNode, $table);
         $prop->setAccessible(false);
 
-        return $tablenode;
+        return $tableNode;
     }
 
     /**
diff --git a/tests/unit/GherkinParamExceptionTest.php b/tests/unit/GherkinParamExceptionTest.php
index f291f34..270c4d4 100644
--- a/tests/unit/GherkinParamExceptionTest.php
+++ b/tests/unit/GherkinParamExceptionTest.php
@@ -28,9 +28,14 @@ protected function _before(): void
         $this->module = Mockery::mock($moduleInstance)
             ->shouldAllowMockingProtectedMethods()
             ->makePartial();
+    }
 
-        $this->module = Mockery::spy($moduleInstance)
-            ->shouldAllowMockingProtectedMethods();
+    /**
+     * @SuppressWarnings(PHPMD.StaticAccess)
+     */
+    protected function _after(): void
+    {
+        Mockery::close();
     }
 
     public function testGetValueFromParamWithExceptionFromConfig(): void
@@ -75,7 +80,7 @@ public function testMapParametersToValuesWithExceptionOnIsArray(): void
                     ->mapParametersToValues(
                         [0,1,2,3,4],
                         [[0],[1],[2],[3],[4]],
-                        "test"
+                        'test'
                     );
             }
         );
@@ -90,9 +95,31 @@ public function testMapParametersToValuesWithExceptionOnIsSet(): void
                     ->mapParametersToValues(
                         [0,1,2,3,4],
                         [],
-                        "test"
+                        'test'
                     );
             }
         );
+    }   
+
+    public function testGetValueFromFixtureWithExceptionOnIsSet(): void
+    {
+        $this->assertThrows(
+            GherkinParamException::class, function () {
+                $this
+                    ->module
+                    ->getValueFromFixture('{{test}}');
+            }
+        );
+    }
+
+    public function testGetValueFromArrayParamWithExceptionOnIsSet(): void
+    {
+        $this->assertThrows(
+            GherkinParamException::class, function () {
+                $this
+                    ->module
+                    ->getValueFromArrayParam('{{test[1]}}');
+            }
+        );
     }
 }
diff --git a/tests/unit/GherkinParamNullableTest.php b/tests/unit/GherkinParamNullableTest.php
index f1b4b48..1adaef2 100644
--- a/tests/unit/GherkinParamNullableTest.php
+++ b/tests/unit/GherkinParamNullableTest.php
@@ -27,6 +27,14 @@ protected function _before(): void
             ->shouldAllowMockingProtectedMethods();
     }
 
+    /**
+     * @SuppressWarnings(PHPMD.StaticAccess)
+     */
+    protected function _after(): void
+    {
+        Mockery::close();
+    }
+
     public function testMapParametersToValuesWithExceptionOnIsArray(): void
     {
         $param = $this
diff --git a/tests/unit/GherkinParamTest.php b/tests/unit/GherkinParamTest.php
new file mode 100644
index 0000000..6fa3869
--- /dev/null
+++ b/tests/unit/GherkinParamTest.php
@@ -0,0 +1,80 @@
+<?php
+
+use \Behat\Gherkin\Node\TableNode;
+use \Codeception\Step;
+
+/**
+ * Happy path unit tests
+ *
+ * @SuppressWarnings(PHPMD.CamelCaseMethodName)
+ */
+class GherkinParamTest extends \Codeception\Test\Unit
+{
+
+    /**
+     * @var \UnitTester
+     */
+    protected $module;
+    protected $fixture;
+
+    /**
+     * @SuppressWarnings(PHPMD.StaticAccess)
+     */
+    protected function _before(): void
+    {
+        $moduleInstance = $this->getModule(
+            'Codeception\Extension\GherkinParam'
+        );
+
+        $this->module = Mockery::spy($moduleInstance);
+    }
+
+    /**
+     * @SuppressWarnings(PHPMD.StaticAccess)
+     */
+    protected function _after(): void
+    {
+        Mockery::close();
+    }
+
+    public function testBeforeStepCallsGetValueFromParamWhenStepParamIsString(): void
+    {
+        $step = new Step\Action('test', ['test']);
+
+        $this->module->_beforeStep($step);
+
+        $this->module->shouldHaveReceived('getValueFromParam', ['test']);
+    }
+
+    public function testBeforeStepCallsParseTableNodeWhenStepParamIsTableNode(): void
+    {
+        $param = new TableNode([1 => ['foo', 'bar', 'baz']]);
+        $step = new Step\Action('test', [$param]);
+
+        $this->module->_beforeStep($step);
+
+        $this->module->shouldHaveReceived('parseTableNode', [$param]);
+    }
+
+    public function testBeforeStepIteratesGetValueFromParamWhenStepParamIsArray(): void
+    {
+        $param = ['foo', 'bar', 'baz'];
+        $step = new Step\Action('test', [$param]);
+
+        $this->module->_beforeStep($step);
+
+        $this->module->shouldHaveReceived('getValueFromParam', ['foo']);
+        $this->module->shouldHaveReceived('getValueFromParam', ['bar']);
+        $this->module->shouldHaveReceived('getValueFromParam', ['baz']);
+    }
+
+    public function testParseTableNodeReturnsValuedTableNode(): void
+    {
+        $input = new TableNode([1 => ['foo', 'bar', 'baz']]);
+
+        $tableNode = $this->module
+            ->parseTableNode($input);
+
+        $this->assertEquals($input, $tableNode);
+    }
+}