Add regression tests for qualified names in codegen

For now only ensure that a locally defined `Result` type or `Send` trait
do not affect the generated code.

Author: tpoliaw

tests/codegen/pass/local_results.rs

@@ -0,0 +1,12 @@
+// Local types overriding the stdlib Result should not affect generated code
+
+type Result<T> = std::result::Result<T, ()>;
+
+#[derive(juniper::GraphQLInputObject)]
+#[graphql(name = "UserInformation")]
+pub struct Update {
+    pub email: Option<String>,
+    pub username: Option<String>,
+}
+
+pub fn main() {}

tests/codegen/pass/local_send.rs

@@ -0,0 +1,12 @@
+// Local types overriding the stdlib Send should not affect generated code
+
+trait Send {}
+
+#[derive(juniper::GraphQLInputObject)]
+#[graphql(name = "UserInformation")]
+pub struct Update {
+    pub email: Option<String>,
+    pub username: Option<String>,
+}
+
+pub fn main() {}

tests/codegen/src/lib.rs

@@ -7,3 +7,10 @@ fn test_failing_compilation() {
     let t = trybuild::TestCases::new();
     t.compile_fail("fail/**/*.rs");
 }
+
+#[rustversion::nightly]
+#[test]
+fn test_passing_compilation() {
+    let t = trybuild::TestCases::new();
+    t.pass("pass/**/*.rs");
+}