Verify that private items were actually documented

Author: roblabla

tests/testsuite/doc.rs

@@ -1557,10 +1557,10 @@ fn doc_private_items() {
             version = "0.0.1"
            "#,
         )
-        .file("src/lib.rs", "fn private_item() {}")
+        .file("src/lib.rs", "mod private { fn private_item() {} }")
         .build();
     assert_that(foo.cargo("doc").arg("--document-private-items"), execs().with_status(0));
 
     assert_that(&foo.root().join("target/doc"), existing_dir());
-    assert_that(&foo.root().join("target/doc/foo/index.html"), existing_file());
+    assert_that(&foo.root().join("target/doc/foo/private/index.html"), existing_file());
 }