add code

tests/Pest/ExampleTest.php

@@ -1,9 +0,0 @@
-<?php
-
-it('succeeds', function () {
-    expect(true)->toBeTrue();
-});
-
-it('fails', function () {
-    expect(false)->toBeTrue();
-});

tests/Pest/SimpleArrayTest.php

@@ -0,0 +1,15 @@
+<?php
+
+test("arrays containing multiple items aren't simple arrays")
+    ->expect(is_simple_array(['foo', 'bar']))->toBeFalse()
+    ->expect(is_simple_array([['foo'], ['bar']]))->toBeFalse();
+
+test("arrays containing a non-array aren't simple arrays")
+    ->expect(
+        is_simple_array(['foo'])
+    )->toBeFalse();
+
+test("arrays containing a single array are simple arrays")
+    ->expect(
+        is_simple_array([['foo', 'bar']])
+    )->toBeTrue();

tests/Pest/UsesTraitTest.php

@@ -0,0 +1,29 @@
+<?php
+
+it('checks for the presence of a trait', function () {
+    expect(uses_trait(Foo::class, FirstTrait::class))->toBeTrue();
+    expect(uses_trait(Foo::class, SecondTrait::class))->toBeFalse();
+});
+
+it('checks recursively', function () {
+    expect(uses_trait(Bar::class, FirstTrait::class))->toBeTrue(); // inherited
+    expect(uses_trait(Bar::class, SecondTrait::class))->toBeTrue();
+});
+
+it('accepts both objects and classes', function () {
+    expect(uses_trait(new Foo, FirstTrait::class))->toBeTrue();
+    expect(uses_trait(new Foo, SecondTrait::class))->toBeFalse();
+});
+
+trait FirstTrait {}
+trait SecondTrait {}
+
+class Foo
+{
+    use FirstTrait;
+}
+
+class Bar extends Foo
+{
+    use SecondTrait;
+}

tests/Pest/VariadicArrayTest.php

@@ -0,0 +1,11 @@
+<?php
+
+it('returns the inner array if a simple array is supplied')
+    ->expect(
+        variadic_array([['foo', 'bar']])
+    )->toBe(['foo', 'bar']);
+
+it('returns the array if a non-simple array is supplied')
+    ->expect(
+        variadic_array(['foo', 'bar'])
+    )->toBe(['foo', 'bar']);