Add tests for CarbonInterval and CarbonPeriod

.github/workflows/phpmd.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: 8.1
+          - php: 8.3
 
     steps:
       - name: Checkout the code

.github/workflows/phpstan.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: 8.1
+          - php: 8.3
 
     steps:
       - name: Checkout the code

phpstan.neon

@@ -28,8 +28,6 @@ parameters:
         - '#should return (\S*)(static|\$this)\(Carbon\\CarbonImmutable\)(\|null)? but returns Carbon\\Carbon(Immutable|Interface)(\|null)?\.$#'
         - '#should return (\S*)\$this\(Carbon\\CarbonInterval\)(\|null)? but returns static\(Carbon\\CarbonInterval\)(\|null)?\.$#'
         - '#should return (\S*)static\(Carbon\\CarbonInterval\)(\|null)? but returns Carbon\\CarbonInterval(\|null)?\.$#'
-        - '#^Access to an undefined property DatePeriod::\$include_end_date\.$#'
-        - '#^Call to an undefined method DatePeriod::[a-zA-Z]+\(\)\.$#'
         - '#^Call to an undefined method DateInterval::(spec|optimize)\(\)\.$#'
         - '#^Property Carbon\\Carbon::\$timezone \(Carbon\\CarbonTimeZone\) does not accept string\.$#'
         - '#^Method class@anonymous/tests/Carbon/TestingAidsTest\.php:\d+::modify\(\) should return class@anonymous/tests/Carbon/TestingAidsTest\.php:\d+ but returns \(DateTimeImmutable\|false\)\.$#'
@@ -58,9 +56,18 @@ parameters:
             paths:
                 - tests/CarbonImmutable/GettersTest.php
         -
-            message: '#^Access to an undefined property Carbon\\CarbonInterval::\$tz_?name\.$#'
+            message: '#^Access to an undefined property Carbon\\CarbonInterval::\$tz_?[Nn]ame\.$#'
             paths:
+                - tests/CarbonInterval/GettersTest.php
                 - tests/CarbonInterval/SettersTest.php
+        -
+            message: '#^Access to an undefined property Carbon\\CarbonPeriod::\$(include)?(Start|End)Date\.$#'
+            paths:
+                - tests/CarbonPeriod/GettersTest.php
+        -
+            message: '#^Access to protected property Carbon\\CarbonPeriod::\$endDate\.$#'
+            paths:
+                - tests/CarbonPeriod/GettersTest.php
         -
             message: '#^Cannot access property \$locale on Carbon\\CarbonPeriod\|string\.$#'
             paths:

tests/CarbonInterval/GettersTest.php

@@ -16,6 +16,7 @@
 use Carbon\Carbon;
 use Carbon\CarbonInterval;
 use Carbon\Translator;
+use DateTimeZone;
 use InvalidArgumentException;
 use Tests\AbstractTestCase;
 
@@ -121,4 +122,23 @@ public function testDebugInfo()
             's' => 10,
         ], $ci->__debugInfo());
     }
+
+    public function testGetTimezone()
+    {
+        $this->assertNull(CarbonInterval::day()->tzName);
+        $this->assertSame(
+            'America/New_York',
+            CarbonInterval::day()->setTimezone('America/New_York')->tzName,
+        );
+        $this->assertSame(
+            'America/New_York',
+            CarbonInterval::day()->setTimezone(
+                new DateTimeZone('America/New_York'),
+            )->tzName,
+        );
+        $this->assertSame(
+            '+05:00',
+            CarbonInterval::day()->setTimezone(5)->tzName,
+        );
+    }
 }