Test fallback to sys_get_temp_dir()

Author: thekid

src/test/php/com/amazon/aws/lambda/unittest/EnvironmentTest.class.php

@@ -5,10 +5,24 @@
 use io\{Path, File, Files};
 use lang\ElementNotFoundException;
 use lang\Environment as System;
-use unittest\{Assert, Test};
+use unittest\{Assert, After, Before, Test};
 use util\Properties;
 
 class EnvironmentTest {
+  private $temp= [];
+
+  #[Before]
+  public function cleanTemp() {
+    foreach (['TEMP', 'TMP', 'TMPDIR', 'TEMPDIR'] as $variable) {
+      $this->temp[$variable]= $_ENV[$variable] ?? null;
+      unset($_ENV[$variable]);
+    }
+  }
+
+  #[After]
+  public function restoreTemp() {
+    $_ENV += $this->temp;
+  }
 
   #[Test]
   public function can_create() {
@@ -26,8 +40,15 @@ public function path() {
   }
 
   #[Test]
-  public function tempDir() {
-    Assert::instance(Path::class, (new Environment('.'))->tempDir());
+  public function tempDir_prefers_using_environment() {
+    $_ENV['TEMP']= 'tmp';
+    Assert::equals(new Path('tmp'), (new Environment('.'))->tempDir());
+  }
+
+  #[Test]
+  public function tempDir_falls_back_to_sys_get_temp_dir() {
+    unset($_ENV['TEMP']);
+    Assert::equals(new Path(sys_get_temp_dir()), (new Environment('.'))->tempDir());
   }
 
   #[Test]