Reorganise test code

This way I don't need to differentiate between tests for generated code
and tests for hand-written code.

rust-bindings/rust/src/collection_ref.rs

@@ -71,6 +71,3 @@ impl hash::Hash for CollectionRef {
         hash::Hash::hash(&self.hash(), state)
     }
 }
-
-#[cfg(test)]
-mod tests;

rust-bindings/rust/src/lib.rs

@@ -13,22 +13,25 @@ extern crate lazy_static;
 
 use glib::Error;
 
-// re-exports
+// code generated by gir
 mod auto;
 pub use crate::auto::functions::*;
 pub use crate::auto::*;
 
-mod repo;
-
+// handwritten code
 #[cfg(any(feature = "v2018_6", feature = "dox"))]
 mod collection_ref;
+mod repo;
 #[cfg(any(feature = "v2018_6", feature = "dox"))]
-pub use crate::collection_ref::CollectionRef;
-
+pub use crate::collection_ref::*;
 mod object_name;
-pub use crate::object_name::ObjectName;
+pub use crate::object_name::*;
 
-// public modules
+// tests
+#[cfg(test)]
+mod tests;
+
+// prelude
 pub mod prelude {
     pub use crate::auto::traits::*;
     pub use crate::repo::RepoExtManual;

rust-bindings/rust/src/repo.rs

@@ -141,6 +141,3 @@ impl<O: IsA<Repo>> RepoExtManual for O {
         }
     }
 }
-
-#[cfg(test)]
-mod tests;

rust-bindings/rust/src/tests/collection_ref.rs

@@ -1,4 +1,4 @@
-use super::*;
+use crate::CollectionRef;
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};
 

rust-bindings/rust/src/tests/mod.rs

@@ -0,0 +1,2 @@
+mod collection_ref;
+mod repo;

rust-bindings/rust/src/tests/repo.rs

@@ -1,4 +1,4 @@
-use super::*;
+use crate::Repo;
 use crate::RepoMode;
 
 #[test]