Add test for invalid type

Author: winstonallo

tests/trybuild_tests.rs

@@ -1,5 +1,11 @@
 #[test]
-fn ui_tests() {
+fn bitmap_too_large() {
     let t = trybuild::TestCases::new();
     t.compile_fail("tests/ui/bitmap_too_large.rs");
 }
+
+#[test]
+fn invalid_type() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail("tests/ui/invalid_type.rs");
+}

tests/ui/invalid_type.rs

@@ -0,0 +1,9 @@
+use macros::bitmap;
+
+fn main() {
+    bitmap!(
+        struct Bits {
+            field0: u8,
+        }
+    );
+}

tests/ui/invalid_type.stderr

@@ -0,0 +1,5 @@
+error: Expected one of u1, u2, u3, u4, u5, u6, and u7
+ --> tests/ui/invalid_type.rs:6:21
+  |
+6 |             field0: u8,
+  |                     ^^