Auto merge of #16935 - servo:out-of-crate-bindings-tests, r=emilio

Move bindings tests out of the style crate

This cuts in almost half the time to run:

```
touch components/style/lib.rs
./mach test-stylo
```

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---
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tests/unit/style/Cargo.toml

@@ -24,6 +24,7 @@ rustc-serialize = "0.3"
 selectors = {path = "../../../components/selectors"}
 servo_atoms = {path = "../../../components/atoms"}
 servo_config = {path = "../../../components/config"}
+servo_url = {path = "../../../components/url"}
+size_of_test = {path = "../../../components/size_of_test"}
 style = {path = "../../../components/style"}
 style_traits = {path = "../../../components/style_traits"}
-servo_url = {path = "../../../components/url"}

tests/unit/style/lib.rs

@@ -17,6 +17,7 @@ extern crate selectors;
 extern crate servo_atoms;
 extern crate servo_config;
 extern crate servo_url;
+#[macro_use] extern crate size_of_test;
 extern crate style;
 extern crate style_traits;
 extern crate test;

tests/unit/style/size_of.rs

@@ -2,10 +2,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#[test]
-fn size_of_property_declaration() {
-    ::style::properties::test_size_of_property_declaration();
-}
+use style::properties;
+
+size_of_test!(test_size_of_property_declaration, properties::PropertyDeclaration, 32);
 
 #[test]
 fn size_of_specified_values() {

tests/unit/stylo/Cargo.toml

@@ -19,9 +19,10 @@ atomic_refcell = "0.1"
 cssparser = "0.13.3"
 env_logger = "0.4"
 euclid = "0.11"
+geckoservo = {path = "../../../ports/geckolib"}
 libc = "0.2"
 log = {version = "0.3.5", features = ["release_max_level_info"]}
 selectors = {path = "../../../components/selectors", features = ["gecko_like_types"]}
+size_of_test = {path = "../../../components/size_of_test"}
 style_traits = {path = "../../../components/style_traits"}
-geckoservo = {path = "../../../ports/geckolib"}
 style = {path = "../../../components/style", features = ["gecko"]}

tests/unit/stylo/build.rs

@@ -2,6 +2,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use std::env;
+use std::fs;
+use std::io::Write;
+use std::path;
 use std::process::Command;
 
 fn main() {
@@ -11,4 +15,13 @@ fn main() {
     println!("cargo:rerun-if-changed=../../../components/style/gecko_bindings/bindings.rs");
     assert!(Command::new("python").arg("./check_bindings.py")
                                   .spawn().unwrap().wait().unwrap().success());
+
+    // https://github.com/rust-lang/cargo/issues/3544
+    let style_out_dir = env::var_os("DEP_FOR SOME REASON THE LINKS KEY IS REQUIRED \
+                                     TO PASS DATA AROUND BETWEEN BUILD SCRIPTS_OUT_DIR").unwrap();
+    fs::File::create(path::PathBuf::from(env::var_os("OUT_DIR").unwrap()).join("bindings.rs"))
+        .unwrap()
+        .write_all(format!("include!(concat!({:?}, \"/gecko/structs_debug.rs\"));",
+                           style_out_dir).as_bytes())
+        .unwrap();
 }

tests/unit/stylo/lib.rs

@@ -8,6 +8,7 @@ extern crate env_logger;
 extern crate geckoservo;
 #[macro_use] extern crate log;
 extern crate selectors;
+#[macro_use] extern crate size_of_test;
 #[macro_use] extern crate style;
 extern crate style_traits;
 
@@ -16,3 +17,9 @@ mod size_of;
 
 mod servo_function_signatures;
 
+use style::*;
+
+#[allow(dead_code, improper_ctypes)]
+mod bindings {
+    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+}

tests/unit/stylo/size_of.rs

@@ -19,10 +19,7 @@ fn size_of_selectors_dummy_types() {
     assert_eq!(align_of::<dummies::Atom>(), align_of::<style::Atom>());
 }
 
-#[test]
-fn size_of_property_declaration() {
-    ::style::properties::test_size_of_property_declaration();
-}
+size_of_test!(test_size_of_property_declaration, style::properties::PropertyDeclaration, 32);
 
 #[test]
 fn size_of_specified_values() {