feat(test): test package json values

tests/manifest.rs

@@ -1,5 +1,11 @@
+extern crate failure;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde_json;
 extern crate wasm_pack;
 
+mod utils;
+
 use std::fs;
 
 use wasm_pack::manifest;
@@ -26,6 +32,15 @@ fn it_creates_a_package_json_default_path() {
     assert!(manifest::write_package_json(&path).is_ok());
     let package_json_path = format!("{}/pkg/package.json", &path);
     assert!(fs::metadata(package_json_path).is_ok());
+    assert!(utils::read_package_json(&path).is_ok());
+    let pkg = utils::read_package_json(&path).unwrap();
+    assert_eq!(pkg.name, "wasm-pack");
+    assert_eq!(pkg.repository.ty, "git");
+    assert_eq!(
+        pkg.repository.url,
+        "https://github.com/ashleygwilliams/wasm-pack.git"
+    );
+    assert_eq!(pkg.files, ["wasm_pack.js", "wasm_pack_bg.wasm"]);
 }
 
 #[test]
@@ -35,4 +50,8 @@ fn it_creates_a_package_json_provided_path() {
     assert!(manifest::write_package_json(&path).is_ok());
     let package_json_path = format!("{}/pkg/package.json", &path);
     assert!(fs::metadata(package_json_path).is_ok());
+    assert!(utils::read_package_json(&path).is_ok());
+    let pkg = utils::read_package_json(&path).unwrap();
+    assert_eq!(pkg.name, "js-hello-world");
+    assert_eq!(pkg.files, ["js_hello_world.js", "js_hello_world_bg.wasm"]);
 }

tests/utils/mod.rs

@@ -0,0 +1,31 @@
+use std::fs::File;
+use std::io::prelude::*;
+
+use failure::Error;
+use serde_json;
+
+#[derive(Deserialize)]
+pub struct NpmPackage {
+    pub name: String,
+    pub description: String,
+    pub version: String,
+    pub license: String,
+    pub repository: Repository,
+    pub files: Vec<String>,
+}
+
+#[derive(Deserialize)]
+pub struct Repository {
+    #[serde(rename = "type")]
+    pub ty: String,
+    pub url: String,
+}
+
+pub fn read_package_json(path: &str) -> Result<NpmPackage, Error> {
+    let manifest_path = format!("{}/pkg/package.json", path);
+    let mut pkg_file = File::open(manifest_path)?;
+    let mut pkg_contents = String::new();
+    pkg_file.read_to_string(&mut pkg_contents)?;
+
+    Ok(serde_json::from_str(&pkg_contents)?)
+}