fix test

Author: syphar

src/docbuilder/rustwide_builder.rs

@@ -817,7 +817,7 @@ mod tests {
             let base = format!("rustdoc/{}/{}", DUMMY_CRATE_NAME, DUMMY_CRATE_VERSION);
 
             // default target was built
-            assert!(storage.exists(&format!("{}/{}/index.html", DUMMY_CRATE_NAME, base))?);
+            assert!(storage.exists(&format!("{}/{}/index.html", base, DUMMY_CRATE_NAME))?);
 
             // other targets too
             for target in DEFAULT_TARGETS {