add version check to the unit tests

clippy_lints/Cargo.toml

@@ -21,6 +21,7 @@ semver = "0.2.1"
 toml = "0.1"
 unicode-normalization = "0.1"
 quine-mc_cluskey = "0.2.2"
+rustc-serialize = "0.3"
 
 [features]
 debugging = []

clippy_lints/src/lib.rs

@@ -36,6 +36,8 @@ extern crate regex_syntax;
 // for finding minimal boolean expressions
 extern crate quine_mc_cluskey;
 
+extern crate rustc_serialize;
+
 extern crate rustc_plugin;
 extern crate rustc_const_eval;
 extern crate rustc_const_math;

clippy_lints/src/utils/cargo.rs

@@ -1,4 +1,8 @@
 use std::collections::HashMap;
+use std::process::Command;
+use std::str::{from_utf8, Utf8Error};
+use std::io;
+use rustc_serialize::json;
 
 #[derive(RustcDecodable, Debug)]
 pub struct Metadata {
@@ -9,11 +13,11 @@ pub struct Metadata {
 
 #[derive(RustcDecodable, Debug)]
 pub struct Package {
-    name: String,
+    pub name: String,
-    version: String,
+    pub version: String,
     id: String,
     source: Option<()>,
-    dependencies: Vec<Dependency>,
+    pub dependencies: Vec<Dependency>,
     pub targets: Vec<Target>,
     features: HashMap<String, Vec<String>>,
     manifest_path: String,
@@ -21,9 +25,9 @@ pub struct Package {
 
 #[derive(RustcDecodable, Debug)]
 pub struct Dependency {
-    name: String,
+    pub name: String,
     source: Option<String>,
-    req: String,
+    pub req: String,
     kind: Option<String>,
     optional: bool,
     uses_default_features: bool,
@@ -46,3 +50,26 @@ pub struct Target {
     pub kind: Vec<Kind>,
     src_path: String,
 }
+
+#[derive(Debug)]
+pub enum Error {
+    Io(io::Error),
+    Utf8(Utf8Error),
+    Json(json::DecoderError),
+}
+
+impl From<io::Error> for Error {
+    fn from(err: io::Error) -> Self { Error::Io(err) }
+}
+impl From<Utf8Error> for Error {
+    fn from(err: Utf8Error) -> Self { Error::Utf8(err) }
+}
+impl From<json::DecoderError> for Error {
+    fn from(err: json::DecoderError) -> Self { Error::Json(err) }
+}
+
+pub fn metadata() -> Result<Metadata, Error> {
+    let output = Command::new("cargo").args(&["metadata", "--no-deps"]).output()?;
+    let stdout = from_utf8(&output.stdout)?;
+    Ok(json::decode(stdout)?)
+}

clippy_lints/src/utils/mod.rs

@@ -23,6 +23,7 @@ pub mod conf;
 mod hir;
 pub mod paths;
 pub use self::hir::{SpanlessEq, SpanlessHash};
+pub mod cargo;
 
 pub type MethodArgs = HirVec<P<Expr>>;
 

src/main.rs

@@ -18,7 +18,7 @@ use syntax::diagnostics;
 use std::path::PathBuf;
 use std::process::Command;
 
-mod cargo;
+use clippy_lints::utils::cargo;
 
 struct ClippyCompilerCalls(RustcDefaultCalls);
 
@@ -122,9 +122,7 @@ pub fn main() {
     };
 
     if let Some("clippy") = std::env::args().nth(1).as_ref().map(AsRef::as_ref) {
-        let output = std::process::Command::new("cargo").args(&["metadata", "--no-deps"]).output().expect("could not run `cargo metadata`");
+        let mut metadata = cargo::metadata().expect("could not obtain cargo metadata");
-        let stdout = std::str::from_utf8(&output.stdout).expect("`cargo metadata` output is not utf8");
-        let mut metadata: cargo::Metadata = rustc_serialize::json::decode(stdout).expect("`cargo metadata` output is not valid json");
         assert_eq!(metadata.version, 1);
         for target in metadata.packages.remove(0).targets {
             let args = std::env::args().skip(2);

tests/versioncheck.rs

@@ -0,0 +1,16 @@
+extern crate clippy_lints;
+use clippy_lints::utils::cargo;
+
+#[test]
+fn check_that_clippy_lints_has_the_same_version_as_clippy() {
+    let clippy_meta = cargo::metadata().expect("could not obtain cargo metadata");
+    std::env::set_current_dir(std::env::current_dir().unwrap().join("clippy_lints")).unwrap();
+    let clippy_lints_meta = cargo::metadata().expect("could not obtain cargo metadata");
+    assert_eq!(clippy_lints_meta.packages[0].version, clippy_meta.packages[0].version);
+    for package in &clippy_meta.packages[0].dependencies {
+        if package.name == "clippy_lints" {
+            assert_eq!(clippy_lints_meta.packages[0].version, package.req[1..]);
+            return;
+        }
+    }
+}