diff --git a/tests/expectations/tests/enum-default-bitfield.rs b/tests/expectations/tests/enum-default-bitfield.rs
index ebf5caa..86a0449 100644
--- a/tests/expectations/tests/enum-default-bitfield.rs
+++ b/tests/expectations/tests/enum-default-bitfield.rs
@@ -5,6 +5,70 @@
     non_upper_case_globals
 )]
 
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct foo {
+    pub member: foo__bindgen_ty_1,
+}
+pub const foo_FOO_A: foo__bindgen_ty_1 = foo__bindgen_ty_1(0);
+pub const foo_FOO_B: foo__bindgen_ty_1 = foo__bindgen_ty_1(1);
+impl ::std::ops::BitOr<foo__bindgen_ty_1> for foo__bindgen_ty_1 {
+    type Output = Self;
+    #[inline]
+    fn bitor(self, other: Self) -> Self {
+        foo__bindgen_ty_1(self.0 | other.0)
+    }
+}
+impl ::std::ops::BitOrAssign for foo__bindgen_ty_1 {
+    #[inline]
+    fn bitor_assign(&mut self, rhs: foo__bindgen_ty_1) {
+        self.0 |= rhs.0;
+    }
+}
+impl ::std::ops::BitAnd<foo__bindgen_ty_1> for foo__bindgen_ty_1 {
+    type Output = Self;
+    #[inline]
+    fn bitand(self, other: Self) -> Self {
+        foo__bindgen_ty_1(self.0 & other.0)
+    }
+}
+impl ::std::ops::BitAndAssign for foo__bindgen_ty_1 {
+    #[inline]
+    fn bitand_assign(&mut self, rhs: foo__bindgen_ty_1) {
+        self.0 &= rhs.0;
+    }
+}
+#[repr(transparent)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct foo__bindgen_ty_1(pub ::std::os::raw::c_uint);
+#[test]
+fn bindgen_test_layout_foo() {
+    assert_eq!(
+        ::std::mem::size_of::<foo>(),
+        4usize,
+        concat!("Size of: ", stringify!(foo))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<foo>(),
+        4usize,
+        concat!("Alignment of ", stringify!(foo))
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<foo>())).member as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(foo),
+            "::",
+            stringify!(member)
+        )
+    );
+}
+impl Default for foo {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
 impl Foo {
     pub const Bar: Foo = Foo(0);
 }
diff --git a/tests/expectations/tests/enum-default-consts.rs b/tests/expectations/tests/enum-default-consts.rs
index ab49663..1f08679 100644
--- a/tests/expectations/tests/enum-default-consts.rs
+++ b/tests/expectations/tests/enum-default-consts.rs
@@ -5,6 +5,42 @@
     non_upper_case_globals
 )]
 
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct foo {
+    pub member: foo__bindgen_ty_1,
+}
+pub const foo_FOO_A: ::std::os::raw::c_uint = 0;
+pub const foo_FOO_B: ::std::os::raw::c_uint = 1;
+pub type foo__bindgen_ty_1 = ::std::os::raw::c_uint;
+#[test]
+fn bindgen_test_layout_foo() {
+    assert_eq!(
+        ::std::mem::size_of::<foo>(),
+        4usize,
+        concat!("Size of: ", stringify!(foo))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<foo>(),
+        4usize,
+        concat!("Alignment of ", stringify!(foo))
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<foo>())).member as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(foo),
+            "::",
+            stringify!(member)
+        )
+    );
+}
+impl Default for foo {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
 pub const Foo_Bar: Foo = 0;
 pub const Foo_Qux: Foo = 1;
 pub type Foo = ::std::os::raw::c_uint;
diff --git a/tests/expectations/tests/enum-default-module.rs b/tests/expectations/tests/enum-default-module.rs
index a81e6ad..7eb63a9 100644
--- a/tests/expectations/tests/enum-default-module.rs
+++ b/tests/expectations/tests/enum-default-module.rs
@@ -5,6 +5,44 @@
     non_upper_case_globals
 )]
 
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct foo {
+    pub member: foo__bindgen_ty_1::Type,
+}
+pub mod foo__bindgen_ty_1 {
+    pub type Type = ::std::os::raw::c_uint;
+    pub const FOO_A: Type = 0;
+    pub const FOO_B: Type = 1;
+}
+#[test]
+fn bindgen_test_layout_foo() {
+    assert_eq!(
+        ::std::mem::size_of::<foo>(),
+        4usize,
+        concat!("Size of: ", stringify!(foo))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<foo>(),
+        4usize,
+        concat!("Alignment of ", stringify!(foo))
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<foo>())).member as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(foo),
+            "::",
+            stringify!(member)
+        )
+    );
+}
+impl Default for foo {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
 pub mod Foo {
     pub type Type = ::std::os::raw::c_uint;
     pub const Bar: Type = 0;
diff --git a/tests/expectations/tests/enum-default-rust.rs b/tests/expectations/tests/enum-default-rust.rs
index b497a5a..788de13 100644
--- a/tests/expectations/tests/enum-default-rust.rs
+++ b/tests/expectations/tests/enum-default-rust.rs
@@ -5,6 +5,47 @@
     non_upper_case_globals
 )]
 
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct foo {
+    pub member: foo__bindgen_ty_1,
+}
+pub const foo_FOO_A: foo__bindgen_ty_1 = foo__bindgen_ty_1::FOO_A;
+pub const foo_FOO_B: foo__bindgen_ty_1 = foo__bindgen_ty_1::FOO_B;
+#[repr(u32)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum foo__bindgen_ty_1 {
+    FOO_A = 0,
+    FOO_B = 1,
+}
+#[test]
+fn bindgen_test_layout_foo() {
+    assert_eq!(
+        ::std::mem::size_of::<foo>(),
+        4usize,
+        concat!("Size of: ", stringify!(foo))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<foo>(),
+        4usize,
+        concat!("Alignment of ", stringify!(foo))
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<foo>())).member as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(foo),
+            "::",
+            stringify!(member)
+        )
+    );
+}
+impl Default for foo {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
 #[repr(u32)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub enum Foo {
diff --git a/tests/expectations/tests/enum.rs b/tests/expectations/tests/enum.rs
index 27a1f41..3a1bffc 100644
--- a/tests/expectations/tests/enum.rs
+++ b/tests/expectations/tests/enum.rs
@@ -5,15 +5,45 @@
     non_upper_case_globals
 )]
 
-#[repr(u32)]
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum Foo {
-    Bar = 0,
-    Qux = 1,
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct foo {
+    pub member: foo__bindgen_ty_1,
 }
-#[repr(i32)]
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum Neg {
-    MinusOne = -1,
-    One = 1,
+pub const foo_FOO_A: ::std::os::raw::c_uint = 0;
+pub const foo_FOO_B: ::std::os::raw::c_uint = 1;
+pub type foo__bindgen_ty_1 = ::std::os::raw::c_uint;
+#[test]
+fn bindgen_test_layout_foo() {
+    assert_eq!(
+        ::std::mem::size_of::<foo>(),
+        4usize,
+        concat!("Size of: ", stringify!(foo))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<foo>(),
+        4usize,
+        concat!("Alignment of ", stringify!(foo))
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<foo>())).member as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(foo),
+            "::",
+            stringify!(member)
+        )
+    );
 }
+impl Default for foo {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
+pub const Foo_Bar: Foo = 0;
+pub const Foo_Qux: Foo = 1;
+pub type Foo = ::std::os::raw::c_uint;
+pub const Neg_MinusOne: Neg = -1;
+pub const Neg_One: Neg = 1;
+pub type Neg = ::std::os::raw::c_int;
diff --git a/tests/expectations/tests/enum_explicit_type_constants.rs b/tests/expectations/tests/enum_explicit_type_constants.rs
index 9406c7f..030d64b 100644
--- a/tests/expectations/tests/enum_explicit_type_constants.rs
+++ b/tests/expectations/tests/enum_explicit_type_constants.rs
@@ -27,3 +27,4 @@
 pub type BoolEnumsAreFun2 = MyType;
 pub const AnonymousVariantOne: ::std::os::raw::c_uchar = 0;
 pub const AnonymousVariantTwo: ::std::os::raw::c_uchar = 1;
+pub type _bindgen_ty_1 = ::std::os::raw::c_uchar;
diff --git a/tests/expectations/tests/issue-1025-unknown-enum-repr.rs b/tests/expectations/tests/issue-1025-unknown-enum-repr.rs
index 1516c0a..c42e167 100644
--- a/tests/expectations/tests/issue-1025-unknown-enum-repr.rs
+++ b/tests/expectations/tests/issue-1025-unknown-enum-repr.rs
@@ -10,3 +10,4 @@
 pub struct a {
     pub _address: u8,
 }
+pub type a__bindgen_ty_1 = i32;
diff --git a/tests/headers/enum-default-bitfield.h b/tests/headers/enum-default-bitfield.h
index be28413..5f3cb95 100644
--- a/tests/headers/enum-default-bitfield.h
+++ b/tests/headers/enum-default-bitfield.h
@@ -1,11 +1,3 @@
 // bindgen-flags: --default-enum-style=bitfield --constified-enum-module=Neg
 
-enum Foo {
-    Bar = 0,
-    Qux
-};
-
-enum Neg {
-    MinusOne = -1,
-    One = 1,
-};
+#include "enum.h"
diff --git a/tests/headers/enum-default-consts.h b/tests/headers/enum-default-consts.h
index 448c303..233d271 100644
--- a/tests/headers/enum-default-consts.h
+++ b/tests/headers/enum-default-consts.h
@@ -1,11 +1,3 @@
 // bindgen-flags: --default-enum-style=consts --constified-enum-module=Neg
 
-enum Foo {
-    Bar = 0,
-    Qux
-};
-
-enum Neg {
-    MinusOne = -1,
-    One = 1,
-};
+#include "enum.h"
diff --git a/tests/headers/enum-default-module.h b/tests/headers/enum-default-module.h
index a2f3d7a..8c2ec1b 100644
--- a/tests/headers/enum-default-module.h
+++ b/tests/headers/enum-default-module.h
@@ -1,11 +1,3 @@
 // bindgen-flags: --default-enum-style=moduleconsts --constified-enum-module=Neg
 
-enum Foo {
-    Bar = 0,
-    Qux
-};
-
-enum Neg {
-    MinusOne = -1,
-    One = 1,
-};
+#include "enum.h"
diff --git a/tests/headers/enum-default-rust.h b/tests/headers/enum-default-rust.h
index 282c62f..7fd2999 100644
--- a/tests/headers/enum-default-rust.h
+++ b/tests/headers/enum-default-rust.h
@@ -1,11 +1,3 @@
 // bindgen-flags: --default-enum-style=rust --constified-enum-module=Neg
 
-enum Foo {
-    Bar = 0,
-    Qux
-};
-
-enum Neg {
-    MinusOne = -1,
-    One = 1,
-};
+#include "enum.h"
diff --git a/tests/headers/enum.h b/tests/headers/enum.h
index f04c213..901b805 100644
--- a/tests/headers/enum.h
+++ b/tests/headers/enum.h
@@ -1,4 +1,12 @@
-// bindgen-flags: --rustified-enum ".*"
+// A few tests for enum-related issues that should be tested with all the enum
+// representations.
+
+struct foo {
+  enum {
+    FOO_A,
+    FOO_B,
+  } member;
+};
 
 enum Foo {
     Bar = 0,