diff --git a/src/Bot/BotInterface.php b/src/Bot/BotInterface.php
index 0655688..06c206f 100755
--- a/src/Bot/BotInterface.php
+++ b/src/Bot/BotInterface.php
@@ -10,7 +10,7 @@
 interface BotInterface {
 
   /**
-   * Process incomming data.
+   * Process incoming data.
    *
    * @param string $data
    *   Json encoded data delivered by the Facebook API.
diff --git a/src/FacebookService.php b/src/FacebookService.php
index 67b715e..f4c5f4b 100755
--- a/src/FacebookService.php
+++ b/src/FacebookService.php
@@ -102,7 +102,7 @@ public function challenge() {
   }
 
   /**
-   * Helper function to unpack an array of Messages into independant items.
+   * Helper function to unpack an array of Messages into independent items.
    *
    * @param array $messages
    *   An array of 1+ MessageInterface objects to send to the user.
diff --git a/tests/src/Kernel/FBMessengerBotWorkflowKernelTest.php b/tests/src/Kernel/FBMessengerBotWorkflowKernelTest.php
index 390b28b..1e5cf10 100755
--- a/tests/src/Kernel/FBMessengerBotWorkflowKernelTest.php
+++ b/tests/src/Kernel/FBMessengerBotWorkflowKernelTest.php
@@ -23,7 +23,7 @@ class FBMessengerBotWorkflowKernelTest extends KernelTestBase {
   public static $modules = array('fb_messenger_bot');
 
   /**
-   * A converstaion factory.
+   * A conversation factory.
    *
    * @var \Drupal\fb_messenger_bot\Conversation\ConversationFactory
    */
diff --git a/tests/src/Kernel/FacebookServiceTranslateRequestTest.php b/tests/src/Kernel/FacebookServiceTranslateRequestTest.php
index 742e07c..cd71e31 100755
--- a/tests/src/Kernel/FacebookServiceTranslateRequestTest.php
+++ b/tests/src/Kernel/FacebookServiceTranslateRequestTest.php
@@ -108,7 +108,7 @@ public function testServiceShouldAssignPostbackMessageType($json) {
    *
    * @dataProvider attachmentMessageDataProvider
    */
-  public function testServiceShouldAssignAttachentMessageType($json) {
+  public function testServiceShouldAssignAttachmentMessageType($json) {
     $original = $this->getTestTextMessage();
     $uid = $original['entry'][0]['messaging'][0]['sender']['id'];
     $translated = $this->service->translateRequest($json);
diff --git a/tests/src/Unit/Step/BotWorkflowStepTest.php b/tests/src/Unit/Step/BotWorkflowStepTest.php
index cf41e6b..9819645 100755
--- a/tests/src/Unit/Step/BotWorkflowStepTest.php
+++ b/tests/src/Unit/Step/BotWorkflowStepTest.php
@@ -204,7 +204,7 @@ public function testProcessMessageMethod($incomingMessage, $expectedValid, $expe
 
     $outcome = $this->questionMessageStep->processResponse($incomingMessage);
 
-    $this->assertInstanceOf('\Drupal\fb_messenger_bot\Step\StepInvocationOutcome', $outcome, 'BotWorkflowStep::procesMessage() did not return a StepInvocationOutcomes.');
+    $this->assertInstanceOf('\Drupal\fb_messenger_bot\Step\StepInvocationOutcome', $outcome, 'BotWorkflowStep::processMessage() did not return a StepInvocationOutcomes.');
 
     $this->assertEquals($expectedValid, $outcome->incomingResponseIsValid());
     $this->assertEquals($expectedMessage, $outcome->getOutboundMessage()[0]->getFormattedMessage()['text']);
diff --git a/tests/src/Unit/Workflow/BotWorkflowTraitTest.php b/tests/src/Unit/Workflow/BotWorkflowTraitTest.php
index 78792b5..6702dd8 100755
--- a/tests/src/Unit/Workflow/BotWorkflowTraitTest.php
+++ b/tests/src/Unit/Workflow/BotWorkflowTraitTest.php
@@ -42,7 +42,7 @@ public function setUp() {
       ],
     ]);
 
-    // Instantiate mock immuatableConfig for configFactory stub's get() method.
+    // Instantiate mock immutableConfig for configFactory stub's get() method.
     // @see Drupal\fb_messenger_bot\Workflow\FBMessengerBotWorkflow::buildSteps().
     $immutableConfig = $this->getMockBuilder('\Drupal\Core\Config\ImmutableConfig')
       ->disableOriginalConstructor()
@@ -131,7 +131,7 @@ public function badDataProvider() {
     return array(
       'string'                       => array('This is a string'),
       'array of unexpected contents' => array(array(1, 2, 3)),
-      'non-iterateable object'       => array(new \stdClass()),
+      'non-iterable object'          => array(new \stdClass()),
     );
 
   }
@@ -255,7 +255,7 @@ public function testGetTrollingMessageReturnValue() {
     // Make sure we have at least one trolling message.
     $this->assertTrue(count($trollingMessages) >= 1);
 
-    // Make sure all contents of the array are actually MessagInterfaces.
+    // Make sure all contents of the array are actually MessageInterfaces.
     foreach ($trollingMessages as $message) {
       $this->assertInstanceOf('\Drupal\fb_messenger_bot\Message\MessageInterface', $message);
     }