Add test to ensure there are no duplicated imports

Author: GuillaumeGomez

tests/rustdoc/reexports-of-same-name.rs

@@ -0,0 +1,26 @@
+// This test ensures that there are 4 imports as expected:
+// * 2 for `Foo`
+// * 2 for `Bar`
+
+#![crate_name = "foo"]
+
+// @has 'foo/index.html'
+
+pub mod nested {
+    /// Foo the struct
+    pub struct Foo {}
+
+    #[allow(non_snake_case)]
+    /// Foo the function
+    pub fn Foo() {}
+}
+
+// @count - '//*[@id="main-content"]//code' 'pub use nested::Foo;' 2
+// @has - '//*[@id="reexport.Foo"]//a[@href="nested/struct.Foo.html"]' 'Foo'
+// @has - '//*[@id="reexport.Foo-1"]//a[@href="nested/fn.Foo.html"]' 'Foo'
+pub use nested::Foo;
+
+// @count - '//*[@id="main-content"]//code' 'pub use Foo as Bar;' 2
+// @has - '//*[@id="reexport.Bar"]//a[@href="nested/struct.Foo.html"]' 'Foo'
+// @has - '//*[@id="reexport.Bar-1"]//a[@href="nested/fn.Foo.html"]' 'Foo'
+pub use Foo as Bar;