diff --git a/tests/bin/install.sh b/tests/bin/install.sh
index 1fde8470591..0864ac1987e 100755
--- a/tests/bin/install.sh
+++ b/tests/bin/install.sh
@@ -128,24 +128,22 @@ install_db() {
 		return 0
 	fi
 
-	# parse DB_HOST for port or socket references
-	local PARTS=(${DB_HOST//\:/ })
-	local DB_HOSTNAME=${PARTS[0]};
-	local DB_SOCK_OR_PORT=${PARTS[1]};
-	local EXTRA=""
-
-	if ! [ -z $DB_HOSTNAME ] ; then
-		if [ $(echo $DB_SOCK_OR_PORT | grep -e '^[0-9]\{1,\}$') ]; then
-			EXTRA=" --host=$DB_HOSTNAME --port=$DB_SOCK_OR_PORT --protocol=tcp"
-		elif ! [ -z $DB_SOCK_OR_PORT ] ; then
-			EXTRA=" --socket=$DB_SOCK_OR_PORT"
-		elif ! [ -z $DB_HOSTNAME ] ; then
-			EXTRA=" --host=$DB_HOSTNAME --protocol=tcp"
+	# If we're trying to connect to a socket we want to handle it differently.
+	if [[ "$DB_HOST" == *.sock ]]; then
+		# create database using the socket
+		mysqladmin create $DB_NAME --socket="$DB_HOST"
+	else
+		# Decide whether or not there is a port.
+		local PARTS=(${DB_HOST//\:/ })
+		if [[ ${PARTS[1]} =~ ^[0-9]+$ ]]; then
+			EXTRA=" --host=${PARTS[0]} --port=${PARTS[1]} --protocol=tcp"
+		else
+			EXTRA=" --host=$DB_HOST --protocol=tcp"
 		fi
-	fi
 
-	# create database
-	mysqladmin create $DB_NAME --user="$DB_USER" --password="$DB_PASS"$EXTRA
+		# create database
+		mysqladmin create $DB_NAME --user="$DB_USER" --password="$DB_PASS"$EXTRA
+	fi
 }
 
 install_wp
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index ad53b3f48a0..0567482dfd8 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -42,7 +42,7 @@ class WC_Unit_Tests_Bootstrap {
 
 		$this->tests_dir    = dirname( __FILE__ );
 		$this->plugin_dir   = dirname( $this->tests_dir );
-		$this->wp_tests_dir = getenv( 'WP_TESTS_DIR' ) ? getenv( 'WP_TESTS_DIR' ) : '/tmp/wordpress-tests-lib';
+		$this->wp_tests_dir = getenv( 'WP_TESTS_DIR' ) ? getenv( 'WP_TESTS_DIR' ) : sys_get_temp_dir() . '/wordpress-tests-lib';
 
 		// load test function so tests_add_filter() is available.
 		require_once $this->wp_tests_dir . '/includes/functions.php';
diff --git a/tests/includes/listener-loader.php b/tests/includes/listener-loader.php
index 3ce669c6b48..0218c2b7292 100644
--- a/tests/includes/listener-loader.php
+++ b/tests/includes/listener-loader.php
@@ -5,5 +5,5 @@
  * @package WooCommerce\UnitTests
  */
 
-$wp_tests_dir = getenv( 'WP_TESTS_DIR' ) ? getenv( 'WP_TESTS_DIR' ) : '/tmp/wordpress-tests-lib';
+$wp_tests_dir = getenv( 'WP_TESTS_DIR' ) ? getenv( 'WP_TESTS_DIR' ) : sys_get_temp_dir() . '/wordpress-tests-lib';
 require_once $wp_tests_dir . '/includes/listener-loader.php';
diff --git a/tests/unit-tests/integrations/maxmind-geolocation/class-wc-tests-maxmind-database.php b/tests/unit-tests/integrations/maxmind-geolocation/class-wc-tests-maxmind-database.php
index aba5a35a1af..e4018d93824 100644
--- a/tests/unit-tests/integrations/maxmind-geolocation/class-wc-tests-maxmind-database.php
+++ b/tests/unit-tests/integrations/maxmind-geolocation/class-wc-tests-maxmind-database.php
@@ -55,7 +55,7 @@ class WC_Tests_MaxMind_Database extends WC_Unit_Test_Case {
 	 */
 	public function test_download_database_works() {
 		$database_service  = new WC_Integration_MaxMind_Database_Service( '' );
-		$expected_database = '/tmp/GeoLite2-Country_20200100/GeoLite2-Country.mmdb';
+		$expected_database = sys_get_temp_dir() . '/GeoLite2-Country_20200100/GeoLite2-Country.mmdb';
 
 		$result = $database_service->download_database( 'testing_license' );