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

in other words, they can only run once per file

tests/Hooks/AfterAllTest.php

@@ -2,26 +2,50 @@
 
 global $globalHook;
 
+// NOTE: this test does not have a $globalHook->calls offset since it is first
+// in the directory and thus will always run before the others. See also the
+// BeforeAllTest.php for details.
+
 uses()->afterAll(function () use ($globalHook) {
     expect($globalHook)
         ->toHaveProperty('afterAll')
         ->and($globalHook->afterAll)
-        ->toBe(0);
+        ->toBe(0)
+        ->and($globalHook->calls)
+        ->afterAll
+        ->toBe(1);
 
     $globalHook->afterAll = 1;
+    $globalHook->calls->afterAll++;
 });
 
 afterAll(function () use ($globalHook) {
     expect($globalHook)
         ->toHaveProperty('afterAll')
         ->and($globalHook->afterAll)
-        ->toBe(1);
+        ->toBe(1)
+        ->and($globalHook->calls)
+        ->afterAll
+        ->toBe(2);
 
     $globalHook->afterAll = 2;
+    $globalHook->calls->afterAll++;
 });
 
 test('global afterAll execution order', function () use ($globalHook) {
     expect($globalHook)
         ->not()
-        ->toHaveProperty('afterAll');
+        ->toHaveProperty('afterAll')
+        ->and($globalHook->calls)
+        ->afterAll
+        ->toBe(0);
+});
+
+test('it only gets called once per file', function () use ($globalHook) {
+    expect($globalHook)
+        ->not()
+        ->toHaveProperty('afterAll')
+        ->and($globalHook->calls)
+        ->afterAll
+        ->toBe(0);
 });