diff --git a/.idea/php.xml b/.idea/php.xml
index 3cf5373..c63a823 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -19,6 +19,11 @@
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpUnit">
+    <phpunit_settings>
+      <PhpUnitSettings load_method="PHPUNIT_PHAR" custom_loader_path="$USER_HOME$/phar/phpunit.phar" phpunit_phar_path="$USER_HOME$/phar/phpunit.phar" />
+    </phpunit_settings>
+  </component>
   <component name="PsalmOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
diff --git a/bootstrap.php b/bootstrap.php
new file mode 100644
index 0000000..3e8e4ab
--- /dev/null
+++ b/bootstrap.php
@@ -0,0 +1,3 @@
+<?php
+    require 'ncc';
+    import('net.nosial.tempfile');
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..491b052
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,11 @@
+<phpunit bootstrap="bootstrap.php">
+    <testsuites>
+        <testsuite name="TempFile Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+    <php>
+        <ini name="error_reporting" value="-1"/>
+        <server name="KERNEL_DIR" value="app/"/>
+    </php>
+</phpunit>
diff --git a/tests/TempFile/TempFileTest.php b/tests/TempFile/TempFileTest.php
new file mode 100644
index 0000000..b5b5d38
--- /dev/null
+++ b/tests/TempFile/TempFileTest.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace TempFile;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Tests for the TempFile class.
+ */
+class TempFileTest extends TestCase
+{
+    /**
+     * Tests the __construct method of TempFile class.
+     */
+    public function testConstruct()
+    {
+        // Test with default options.
+        $tempFile = new TempFile(null);
+        $this->assertTrue(is_file($tempFile->getFilepath()));
+        $this->assertStringEndsWith('.tmp', $tempFile->getFilename());
+
+        // Test with custom options.
+        $customOptions = [
+            Options::Extension => 'txt',
+            Options::Filename => 'testfile',
+            Options::Prefix => 'prefix_',
+            Options::Suffix => '_suffix',
+            Options::RandomLength => 5,
+            Options::Directory => sys_get_temp_dir(),
+        ];
+        $tempFile = new TempFile($customOptions);
+        $this->assertStringEndsWith('.txt', $tempFile->getFilename());
+        $this->assertStringStartsWith('prefix_', $tempFile->getFilename());
+        $this->assertStringEndsWith('_suffix.txt', $tempFile->getFilename());
+        $this->assertSame($customOptions[Options::Directory], dirname($tempFile->getFilepath()));
+
+        // Test when a non-string and non-integer value is given to any options.
+        $customOptions[Options::Prefix] = [];
+        $this->expectException(\InvalidArgumentException::class);
+        new TempFile($customOptions);
+
+        // Test when an invalid option is given.
+        $customOptions = ['invalid_option' => 'value'];
+        $this->expectException(\InvalidArgumentException::class);
+        new TempFile($customOptions);
+
+        // Test when a directory that does not exist is given.
+        $customOptions = [Options::Directory => '/nonexistent/directory'];
+        $this->expectException(\InvalidArgumentException::class);
+        new TempFile($customOptions);
+
+        // Test when a directory that is not writable is given.
+        $customOptions = [Options::Directory => '/'];
+        $this->expectException(\InvalidArgumentException::class);
+        new TempFile($customOptions);
+
+        // Test if is writeable
+        $customOptions = [Options::Directory => sys_get_temp_dir()];
+        $tempFile = new TempFile($customOptions);
+        $this->assertTrue(is_writable($tempFile->getFilepath()));
+    }
+}
\ No newline at end of file
diff --git a/tests/file_test.php b/tests/file_test.php
deleted file mode 100644
index 4f24699..0000000
--- a/tests/file_test.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-    require 'ncc';
-    import('net.nosial.tempfile');
-
-    $temp = new \TempFile\TempFile([
-        \TempFile\Options::Extension => 'txt',
-        \TempFile\Options::Filename => 'test',
-    ]);
-    print(sprintf('Tempfile: %s', $temp->getFilepath()) . PHP_EOL);
-
-    file_put_contents($temp, 'Hello, world!');
-    print(sprintf('Filesize: %s', filesize($temp->getFilepath())) . PHP_EOL);
-
-    sleep(10);
-    print('Exiting...' . PHP_EOL);
-    exit(0);
\ No newline at end of file