Fix benchmarks (#901)

* Restore #![feature(test)] and extern crate test; statements, which
were mistakenly removed as part of the Rust 2018 edition migration.

* Fix rendering benchmark's usage of RenderContext. 6 parameters were
provided when 5 were expected.

components/rendering/benches/all.rs

@@ -1,5 +1,7 @@
+#![feature(test)]
+extern crate test;
+
 use std::collections::HashMap;
-use std::path::Path;
 
 use config::Config;
 use front_matter::InsertAnchor;
@@ -85,7 +87,7 @@ fn bench_render_content_with_highlighting(b: &mut test::Bencher) {
     let permalinks_ctx = HashMap::new();
     let config = Config::default();
     let context =
-        RenderContext::new(&tera, &config, "", &permalinks_ctx, Path::new(""), InsertAnchor::None);
+        RenderContext::new(&tera, &config, "", &permalinks_ctx, InsertAnchor::None);
     b.iter(|| render_content(CONTENT, &context).unwrap());
 }
 
@@ -97,7 +99,7 @@ fn bench_render_content_without_highlighting(b: &mut test::Bencher) {
     let mut config = Config::default();
     config.highlight_code = false;
     let context =
-        RenderContext::new(&tera, &config, "", &permalinks_ctx, Path::new(""), InsertAnchor::None);
+        RenderContext::new(&tera, &config, "", &permalinks_ctx, InsertAnchor::None);
     b.iter(|| render_content(CONTENT, &context).unwrap());
 }
 
@@ -109,7 +111,7 @@ fn bench_render_content_no_shortcode(b: &mut test::Bencher) {
     config.highlight_code = false;
     let permalinks_ctx = HashMap::new();
     let context =
-        RenderContext::new(&tera, &config, "", &permalinks_ctx, Path::new(""), InsertAnchor::None);
+        RenderContext::new(&tera, &config, "", &permalinks_ctx, InsertAnchor::None);
 
     b.iter(|| render_content(&content2, &context).unwrap());
 }
@@ -121,7 +123,7 @@ fn bench_render_shortcodes_one_present(b: &mut test::Bencher) {
     let config = Config::default();
     let permalinks_ctx = HashMap::new();
     let context =
-        RenderContext::new(&tera, &config, "", &permalinks_ctx, Path::new(""), InsertAnchor::None);
+        RenderContext::new(&tera, &config, "", &permalinks_ctx, InsertAnchor::None);
 
     b.iter(|| render_shortcodes(CONTENT, &context));
 }

components/site/benches/load.rs

@@ -1,4 +1,7 @@
 //! Benchmarking loading/markdown rendering of generated sites of various sizes
+#![feature(test)]
+extern crate test;
+
 use std::env;
 
 use site::Site;

components/site/benches/site.rs

@@ -1,3 +1,6 @@
+#![feature(test)]
+extern crate test;
+
 use std::env;
 
 use library::Paginator;