test: global "all" hooks must only run once (#351)

in other words, they can only run once per file

tests/Hooks/BeforeAllTest.php

@@ -1,28 +1,56 @@
 <?php
 
+use Pest\Support\Str;
+
 global $globalHook;
 
-uses()->beforeAll(function () use ($globalHook) {
+// HACK: we have to determine our $globalHook->calls baseline. This is because
+// two other tests are executed before this one due to filename ordering.
+$args = $_SERVER['argv'] ?? [];
+$single = isset($args[1]) && Str::endsWith(__FILE__, $args[1]);
+$offset = $single ? 0 : 2;
+
+uses()->beforeAll(function () use ($globalHook, $offset) {
     expect($globalHook)
         ->toHaveProperty('beforeAll')
         ->and($globalHook->beforeAll)
-        ->toBe(0);
+        ->toBe(0)
+        ->and($globalHook->calls)
+        ->beforeAll
+        ->toBe(1 + $offset);
 
     $globalHook->beforeAll = 1;
+    $globalHook->calls->beforeAll++;
 });
 
-beforeAll(function () use ($globalHook) {
+beforeAll(function () use ($globalHook, $offset) {
     expect($globalHook)
         ->toHaveProperty('beforeAll')
         ->and($globalHook->beforeAll)
-        ->toBe(1);
+        ->toBe(1)
+        ->and($globalHook->calls)
+        ->beforeAll
+        ->toBe(2 + $offset);
 
     $globalHook->beforeAll = 2;
+    $globalHook->calls->beforeAll++;
 });
 
-test('global beforeAll execution order', function () use ($globalHook) {
+test('global beforeAll execution order', function () use ($globalHook, $offset) {
     expect($globalHook)
         ->toHaveProperty('beforeAll')
         ->and($globalHook->beforeAll)
-        ->toBe(2);
+        ->toBe(2)
+        ->and($globalHook->calls)
+        ->beforeAll
+        ->toBe(3 + $offset);
+});
+
+it('only gets called once per file', function () use ($globalHook, $offset) {
+    expect($globalHook)
+        ->beforeAll
+        ->toBe(2)
+        ->and($globalHook->calls)
+        ->beforeAll
+        ->toBe(3 + $offset);
 });