feat(test): test readme is a copy

tests/readme.rs

@@ -1,17 +1,32 @@
+extern crate failure;
 extern crate wasm_pack;
 
+mod readme_utils;
+
 use std::fs;
 
 use wasm_pack::readme;
 
 #[test]
 fn it_copies_a_readme_default_path() {
-    assert!(readme::copy_from_crate(".").is_ok());
+    let path = ".".to_string();
-    assert!(fs::metadata("./pkg/README.md").is_ok());
+    assert!(readme::copy_from_crate(&path).is_ok());
+    let crate_readme_path = format!("{}/README.md", &path);
+    let pkg_readme_path = format!("{}/pkg/README.md", &path);
+    assert!(fs::metadata(&pkg_readme_path).is_ok());
+    let crate_readme = readme_utils::read_file(&crate_readme_path).unwrap();
+    let pkg_readme = readme_utils::read_file(&pkg_readme_path).unwrap();
+    assert_eq!(crate_readme, pkg_readme);
 }
 
 #[test]
 fn it_creates_a_package_json_provided_path() {
-    assert!(readme::copy_from_crate("./examples/js-hello-world").is_ok());
+    let path = "./examples/js-hello-world".to_string();
-    assert!(fs::metadata("./examples/js-hello-world/pkg/README.md").is_ok());
+    assert!(readme::copy_from_crate(&path).is_ok());
+    let crate_readme_path = format!("{}/README.md", &path);
+    let pkg_readme_path = format!("{}/pkg/README.md", &path);
+    assert!(fs::metadata(&pkg_readme_path).is_ok());
+    let crate_readme = readme_utils::read_file(&crate_readme_path).unwrap();
+    let pkg_readme = readme_utils::read_file(&pkg_readme_path).unwrap();
+    assert_eq!(crate_readme, pkg_readme);
 }

tests/readme_utils/mod.rs

@@ -0,0 +1,12 @@
+use std::fs::File;
+use std::io::Read;
+
+use failure::Error;
+
+pub fn read_file(path: &str) -> Result<String, Error> {
+    let mut file = File::open(path)?;
+    let mut contents = String::new();
+    file.read_to_string(&mut contents)?;
+
+    Ok(contents)
+}