diff --git a/hphp/hack/test/integration/data/simple_repo/.hhconfig b/hphp/hack/test/integration/data/simple_repo/.hhconfig
index 2d9e0960491fb8..b3d2769f5a8e7d 100644
--- a/hphp/hack/test/integration/data/simple_repo/.hhconfig
+++ b/hphp/hack/test/integration/data/simple_repo/.hhconfig
@@ -7,3 +7,6 @@ disallow_fun_and_cls_meth_pseudo_funcs = true
 
 auto_namespace_map = {"Herp": "Derp\\Lib\\Herp"}
 disable_xhp_element_mangling = false
+
+allowed_files_for_module_declarations = modules.php, modules_ns.php
+
diff --git a/hphp/hack/test/integration/data/simple_repo/Attribute.php b/hphp/hack/test/integration/data/simple_repo/Attribute.php
new file mode 100644
index 00000000000000..0167d368b2371e
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/Attribute.php
@@ -0,0 +1,4 @@
+<?hh // strict
+
+class Attribute implements HH\ModuleAttribute {
+}
diff --git a/hphp/hack/test/integration/data/simple_repo/ClassBar.php b/hphp/hack/test/integration/data/simple_repo/ClassBar.php
new file mode 100644
index 00000000000000..490d22e2bdf23c
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/ClassBar.php
@@ -0,0 +1,25 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+module bar;
+
+internal class CI {
+  internal int $x = 0;
+  static internal int $y = 0;
+}
+
+abstract class X {
+  abstract internal function foo(): CI;
+}
+
+class Y {
+  internal function foo(): CI {
+    return new CI();
+  }
+
+  public function foobar(): void {
+  }
+
+  static internal function barfoo(): void {
+  }
+}
diff --git a/hphp/hack/test/integration/data/simple_repo/ClassFoo.php b/hphp/hack/test/integration/data/simple_repo/ClassFoo.php
new file mode 100644
index 00000000000000..51040fe28a3dab
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/ClassFoo.php
@@ -0,0 +1,8 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+module foo;
+
+internal class ClassFoo {
+
+}
diff --git a/hphp/hack/test/integration/data/simple_repo/ClassFooNS.php b/hphp/hack/test/integration/data/simple_repo/ClassFooNS.php
new file mode 100644
index 00000000000000..ad8013ccfa7a33
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/ClassFooNS.php
@@ -0,0 +1,8 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+module fooNS;
+
+class ClassFooNS {
+
+}
diff --git a/hphp/hack/test/integration/data/simple_repo/Members.php b/hphp/hack/test/integration/data/simple_repo/Members.php
new file mode 100644
index 00000000000000..eca17f116a5ebe
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/Members.php
@@ -0,0 +1,28 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+module foo;
+
+newtype N = int;
+
+internal newtype NI = int;
+
+trait T {
+}
+
+internal trait TI {
+}
+
+interface I {
+}
+
+internal interface II {
+}
+
+enum E: int {
+  Red = 3;
+}
+
+internal enum EI: int {
+  Red = 3;
+}
diff --git a/hphp/hack/test/integration/data/simple_repo/modules.php b/hphp/hack/test/integration/data/simple_repo/modules.php
new file mode 100644
index 00000000000000..3e5e010bbbd300
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/modules.php
@@ -0,0 +1,7 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+
+<<Attribute>>
+new module foo {}
+new module bar {}
diff --git a/hphp/hack/test/integration/data/simple_repo/modules_ns.php b/hphp/hack/test/integration/data/simple_repo/modules_ns.php
new file mode 100644
index 00000000000000..f09fbcf60d34a1
--- /dev/null
+++ b/hphp/hack/test/integration/data/simple_repo/modules_ns.php
@@ -0,0 +1,7 @@
+<?hh // strict
+<<file: __EnableUnstableFeatures('modules')>>
+
+// namespace don't apply to modules
+namespace SomeNS;
+
+new module fooNS {}