Add tests for reorder_extern_crates

Author: topecongiro

tests/source/configs/reorder_extern_crates/false.rs

@@ -0,0 +1,11 @@
+// rustfmt-reorder_extern_crates: false
+
+extern crate foo;
+extern crate bar;
+extern crate foobar;
+
+#[macro_use]
+extern crate nom;
+extern crate regex;
+#[macro_use]
+extern crate log;

tests/source/configs/reorder_extern_crates/true.rs

@@ -0,0 +1,11 @@
+// rustfmt-reorder_extern_crates: true
+
+extern crate foo;
+extern crate bar;
+extern crate foobar;
+
+#[macro_use]
+extern crate nom;
+extern crate regex;
+#[macro_use]
+extern crate log;

tests/target/configs/reorder_extern_crates/false.rs

@@ -0,0 +1,11 @@
+// rustfmt-reorder_extern_crates: false
+
+extern crate foo;
+extern crate bar;
+extern crate foobar;
+
+#[macro_use]
+extern crate nom;
+extern crate regex;
+#[macro_use]
+extern crate log;

tests/target/configs/reorder_extern_crates/true.rs

@@ -0,0 +1,11 @@
+// rustfmt-reorder_extern_crates: true
+
+extern crate bar;
+extern crate foo;
+extern crate foobar;
+
+#[macro_use]
+extern crate nom;
+extern crate regex;
+#[macro_use]
+extern crate log;