diff --git a/tests/data/openssl.cnf b/tests/data/openssl.cnf
index 1eb86c40126308376e1c6e816d4988badd369fb8..1aada1fa73f88a369a24290e890b6f12f5ef12a8 100644
--- a/tests/data/openssl.cnf
+++ b/tests/data/openssl.cnf
@@ -55,7 +55,7 @@ crl		= $dir/crl.pem 		# The current CRL
 private_key	= $dir/private/cakey.pem# The private key
 RANDFILE	= $dir/private/.rand	# private random number file
 
-x509_extensions	= usr_cert		# The extentions to add to the cert
+x509_extensions	= usr_cert		# The extensions to add to the cert
 
 # Comment out the following two lines for the "traditional"
 # (and highly broken) format.
@@ -107,7 +107,7 @@ default_bits		= 2048
 default_keyfile 	= privkey.pem
 distinguished_name	= req_distinguished_name
 attributes		= req_attributes
-x509_extensions	= v3_ca	# The extentions to add to the self signed cert
+x509_extensions	= v3_ca	# The extensions to add to the self signed cert
 
 # Passwords for private keys if not present they will be prompted for
 # input_password = secret
diff --git a/tests/lib/cache.php b/tests/lib/cache.php
index feddcac4693d8819615ba9998010bd57aedebbf4..a91f37467d2f56298f5978dd2c215933b43b9c8e 100644
--- a/tests/lib/cache.php
+++ b/tests/lib/cache.php
@@ -28,7 +28,7 @@ abstract class Test_Cache extends \Test\TestCase {
 		$this->instance->set('value1', $value);
 		$this->assertTrue($this->instance->hasKey('value1'));
 		$received=$this->instance->get('value1');
-		$this->assertEquals($value, $received, 'Value recieved from cache not equal to the original');
+		$this->assertEquals($value, $received, 'Value received from cache not equal to the original');
 		$value='ipsum lorum';
 		$this->instance->set('value1', $value);
 		$received=$this->instance->get('value1');
diff --git a/tests/lib/datetimeformatter.php b/tests/lib/datetimeformatter.php
index 9a50ee4a257307ed03c3618d68a5e9bb880b06cc..bf1ef3b84dc644a15356f7c55a3d35f88cd710c3 100644
--- a/tests/lib/datetimeformatter.php
+++ b/tests/lib/datetimeformatter.php
@@ -42,7 +42,7 @@ class DateTimeFormatter extends TestCase {
 	}
 
 	public function formatTimeSpanData() {
-		$time = 1416916800; // Use a fixed timestamp so we dont switch days/years with the getTimestampAgo
+		$time = 1416916800; // Use a fixed timestamp so we don't switch days/years with the getTimestampAgo
 		$deL10N = new \OC_L10N('lib', 'de');
 		return array(
 			array('seconds ago',	$time, $time),
@@ -80,7 +80,7 @@ class DateTimeFormatter extends TestCase {
 	}
 
 	public function formatDateSpanData() {
-		$time = 1416916800; // Use a fixed timestamp so we dont switch days/years with the getTimestampAgo
+		$time = 1416916800; // Use a fixed timestamp so we don't switch days/years with the getTimestampAgo
 		$deL10N = new \OC_L10N('lib', 'de');
 		return array(
 			// Normal testing
diff --git a/tests/lib/db/connection.php b/tests/lib/db/connection.php
index 62d0a77ca1fe7a66dc4d4a3f11fa35082e58dc12..4022bee511e0aa9bf1f916d559d43ad90bf5e471 100644
--- a/tests/lib/db/connection.php
+++ b/tests/lib/db/connection.php
@@ -72,7 +72,7 @@ class Connection extends \Test\TestCase {
 			// sqlite removes the tables after closing the DB
 			$this->assertTrue(true);
 		} else {
-			$this->assertFalse($this->connection->tableExists($table), 'Table ' . $table . ' doesnt exists.');
+			$this->assertFalse($this->connection->tableExists($table), 'Table ' . $table . " doesn't exist.");
 		}
 	}
 
diff --git a/tests/lib/files/storage/storage.php b/tests/lib/files/storage/storage.php
index f3d265df2de71b60bb49946f0a6065ba0ece1b64..ed2ea87f9d96cca0f7cd9c4679bef6096be249f0 100644
--- a/tests/lib/files/storage/storage.php
+++ b/tests/lib/files/storage/storage.php
@@ -87,13 +87,13 @@ abstract class Storage extends \Test\TestCase {
 		}
 		$this->assertEquals(array($directory), $content);
 
-		$this->assertFalse($this->instance->mkdir('/' . $directory)); //cant create existing folders
+		$this->assertFalse($this->instance->mkdir('/' . $directory)); //can't create existing folders
 		$this->assertTrue($this->instance->rmdir('/' . $directory));
 
 		$this->wait();
 		$this->assertFalse($this->instance->file_exists('/' . $directory));
 
-		$this->assertFalse($this->instance->rmdir('/' . $directory)); //cant remove non existing folders
+		$this->assertFalse($this->instance->rmdir('/' . $directory)); //can't remove non existing folders
 
 		$dh = $this->instance->opendir('/');
 		$content = array();
diff --git a/tests/lib/hookhelper.php b/tests/lib/hookhelper.php
index 93411bd068b30eb97bde301e015eb5525cf94b1f..f1cce831477b86e9d1d0716340ad9f9c145b8016 100644
--- a/tests/lib/hookhelper.php
+++ b/tests/lib/hookhelper.php
@@ -104,7 +104,7 @@ class HookHelper {
 	}
 
 	/**
-	 * Callback that sets the run paramter to false
+	 * Callback that sets the run parameter to false
 	 */
 	public static function cancellingCallback($params) {
 		$params[Filesystem::signal_param_run] = false;
diff --git a/tests/lib/systemtag/systemtagmanagertest.php b/tests/lib/systemtag/systemtagmanagertest.php
index 64220205ade928d9268db1245beeddbf5e1be29d..1afb147f08acc3577c55fb7d10fb646309ce0549 100644
--- a/tests/lib/systemtag/systemtagmanagertest.php
+++ b/tests/lib/systemtag/systemtagmanagertest.php
@@ -124,7 +124,7 @@ class SystemTagManagerTest extends TestCase {
 				null,
 				[]
 			],
-			// filter by visibile only
+			// filter by visible only
 			[
 				// none visible
 				[
diff --git a/tests/lib/testcase.php b/tests/lib/testcase.php
index 008b96b3417100b6300013f6984cdd3b938ff456..fb0db8cd86c00fb9ad165aa5fdca195716fabbde 100644
--- a/tests/lib/testcase.php
+++ b/tests/lib/testcase.php
@@ -349,7 +349,7 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase {
 			$user = null;
 		}
 
-		\OC_Util::tearDownFS(); // command cant reply on the fs being setup
+		\OC_Util::tearDownFS(); // command can't reply on the fs being setup
 		$this->commandBus->run();
 		\OC_Util::tearDownFS();