Add test for attribute invalidation

tests/diff/testOnlyCall/a/attribute.hack

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+namespace Hakana;
+
+/**
+ * Used to denote a function that's only meant to be used in tests.
+ * Everything in hakana.json's test_files field is already considered test-only.
+ * This attribute should be used when test functions/classes live in the same file
+ * as production functions & classes
+ */
+final class TestOnly implements \HH\FunctionAttribute, \HH\ClassAttribute, \HH\MethodAttribute {
+ public function __construct() {}
+}

tests/diff/testOnlyCall/a/input.hack

@@ -0,0 +1,12 @@
+<<__EntryPoint>>
+function main(): void {
+ test_fn();
+ other_fn();
+}
+
+<<Hakana\TestOnly>>
+function test_fn(): void {}
+
+function other_fn(): void {
+ test_fn();
+}

tests/diff/testOnlyCall/b/attribute.hack

@@ -0,0 +1,11 @@
+namespace Hakana;
+
+/**
+ * Used to denote a function that's only meant to be used in tests.
+ * Everything in hakana.json's test_files field is already considered test-only.
+ * This attribute should be used when test functions/classes live in the same file
+ * as production functions & classes
+ */
+final class TestOnly implements \HH\FunctionAttribute, \HH\ClassAttribute, \HH\MethodAttribute {
+ public function __construct() {}
+}

tests/diff/testOnlyCall/b/input.hack

@@ -0,0 +1,13 @@
+<<__EntryPoint, Hakana\TestOnly>>
+function main(): void {
+ test_fn();
+ other_fn();
+}
+
+<<Hakana\TestOnly>>
+function test_fn(): void {}
+
+<<Hakana\TestOnly>>
+function other_fn(): void {
+ test_fn();
+}