diff --git a/src/Functions.php b/src/Functions.php
index a7e1354a..e59641dc 100644
--- a/src/Functions.php
+++ b/src/Functions.php
@@ -12,95 +12,111 @@ use Pest\Support\HigherOrderTapProxy;
 use Pest\TestSuite;
 use PHPUnit\Framework\TestCase;
 
-/**
- * Runs the given closure before all tests in the current file.
- */
-function beforeAll(Closure $closure): void
-{
-    TestSuite::getInstance()->beforeAll->set($closure);
-}
-
-/**
- * Runs the given closure before each test in the current file.
- *
- * @return BeforeEachCall|TestCase|mixed
- */
-function beforeEach(Closure $closure = null): BeforeEachCall
-{
-    $filename = Backtrace::file();
-
-    return new BeforeEachCall(TestSuite::getInstance(), $filename, $closure);
-}
-
-/**
- * Registers the given dataset.
- *
- * @param Closure|iterable<int|string, mixed> $dataset
- */
-function dataset(string $name, $dataset): void
-{
-    Datasets::set($name, $dataset);
-}
-
-/**
- * The uses function binds the given
- * arguments to test closures.
- */
-function uses(string ...$classAndTraits): UsesCall
-{
-    $filename = Backtrace::file();
-
-    return new UsesCall($filename, $classAndTraits);
-}
-
-/**
- * Adds the given closure as a test. The first argument
- * is the test description; the second argument is
- * a closure that contains the test expectations.
- *
- * @return TestCall|TestCase|mixed
- */
-function test(string $description = null, Closure $closure = null)
-{
-    if ($description === null && TestSuite::getInstance()->test !== null) {
-        return new HigherOrderTapProxy(TestSuite::getInstance()->test);
+if (!function_exists('beforeAll')) {
+    /**
+     * Runs the given closure before all tests in the current file.
+     */
+    function beforeAll(Closure $closure): void
+    {
+        TestSuite::getInstance()->beforeAll->set($closure);
     }
-
-    $filename = Backtrace::testFile();
-
-    return new TestCall(TestSuite::getInstance(), $filename, $description, $closure);
 }
 
-/**
- * Adds the given closure as a test. The first argument
- * is the test description; the second argument is
- * a closure that contains the test expectations.
- *
- * @return TestCall|TestCase|mixed
- */
-function it(string $description, Closure $closure = null): TestCall
-{
-    $description = sprintf('it %s', $description);
+if (!function_exists('beforeEach')) {
+    /**
+     * Runs the given closure before each test in the current file.
+     *
+     * @return BeforeEachCall|TestCase|mixed
+     */
+    function beforeEach(Closure $closure = null): BeforeEachCall
+    {
+        $filename = Backtrace::file();
 
-    return test($description, $closure);
+        return new BeforeEachCall(TestSuite::getInstance(), $filename, $closure);
+    }
 }
 
-/**
- * Runs the given closure after each test in the current file.
- *
- * @return AfterEachCall|TestCase|mixed
- */
-function afterEach(Closure $closure = null): AfterEachCall
-{
-    $filename = Backtrace::file();
-
-    return new AfterEachCall(TestSuite::getInstance(), $filename, $closure);
+if (!function_exists('dataset')) {
+    /**
+     * Registers the given dataset.
+     *
+     * @param Closure|iterable<int|string, mixed> $dataset
+     */
+    function dataset(string $name, $dataset): void
+    {
+        Datasets::set($name, $dataset);
+    }
 }
 
-/**
- * Runs the given closure after all tests in the current file.
- */
-function afterAll(Closure $closure): void
-{
-    TestSuite::getInstance()->afterAll->set($closure);
+if (!function_exists('uses')) {
+    /**
+     * The uses function binds the given
+     * arguments to test closures.
+     */
+    function uses(string ...$classAndTraits): UsesCall
+    {
+        $filename = Backtrace::file();
+
+        return new UsesCall($filename, $classAndTraits);
+    }
+}
+
+if (!function_exists('test')) {
+    /**
+     * Adds the given closure as a test. The first argument
+     * is the test description; the second argument is
+     * a closure that contains the test expectations.
+     *
+     * @return TestCall|TestCase|mixed
+     */
+    function test(string $description = null, Closure $closure = null)
+    {
+        if ($description === null && TestSuite::getInstance()->test !== null) {
+            return new HigherOrderTapProxy(TestSuite::getInstance()->test);
+        }
+
+        $filename = Backtrace::testFile();
+
+        return new TestCall(TestSuite::getInstance(), $filename, $description, $closure);
+    }
+}
+
+if (!function_exists('it')) {
+    /**
+     * Adds the given closure as a test. The first argument
+     * is the test description; the second argument is
+     * a closure that contains the test expectations.
+     *
+     * @return TestCall|TestCase|mixed
+     */
+    function it(string $description, Closure $closure = null): TestCall
+    {
+        $description = sprintf('it %s', $description);
+
+        return test($description, $closure);
+    }
+}
+
+if (!function_exists('afterEach')) {
+    /**
+     * Runs the given closure after each test in the current file.
+     *
+     * @return AfterEachCall|TestCase|mixed
+     */
+    function afterEach(Closure $closure = null): AfterEachCall
+    {
+        $filename = Backtrace::file();
+
+        return new AfterEachCall(TestSuite::getInstance(), $filename, $closure);
+    }
+}
+
+if (!function_exists('afterAll')) {
+    /**
+     * Runs the given closure after all tests in the current file.
+     */
+    function afterAll(Closure $closure): void
+    {
+        TestSuite::getInstance()->afterAll->set($closure);
+    }
 }