basic tests for metadata command

src/cargo/ops/cargo_output_metadata.rs

@@ -27,7 +27,8 @@ impl Decodable for OutputTo {
     fn decode<D: Decoder>(d: &mut D) -> Result<OutputTo, D::Error> {
         d.read_option(|d, b| {
             if b {
-                Ok(OutputTo::Path(try!(Decodable::decode(d))))
+                let path = PathBuf::from(try!(d.read_str()));
+                Ok(OutputTo::Path(path))
             } else {
                 Ok(OutputTo::StdOut)
             }

tests/test_cargo_metadata.rs

@@ -0,0 +1,85 @@
+use std::fs::File;
+use std::io::prelude::*;
+
+use support::{project, execs, basic_bin_manifest};
+use hamcrest::{assert_that, existing_file, is, equal_to};
+
+
+fn setup() {
+}
+
+test!(cargo_metadata_simple {
+    let p = project("foo")
+        .file("Cargo.toml", &basic_bin_manifest("foo"));
+
+    assert_that(p.cargo_process("metadata"), execs().with_stdout(format!(r#"
+[[packages]]
+dependencies = []
+manifest_path = "{}/Cargo.toml"
+name = "foo"
+version = "0.5.0"
+
+[[packages.targets]]
+kind = ["bin"]
+name = "foo"
+src_path = "src/foo.rs"
+
+[root]
+name = "foo"
+version = "0.5.0"
+
+"#, p.root().to_str().unwrap())));
+});
+
+test!(cargo_metadata_simple_json {
+    let p = project("foo")
+            .file("Cargo.toml", &basic_bin_manifest("foo"));
+
+    assert_that(p.cargo_process("metadata").arg("-f").arg("json"), execs().with_stdout(format!(r#"{{"root":{{"name":"foo","version":"0.5.0","features":null}},"packages":[{{"name":"foo","version":"0.5.0","dependencies":[],"targets":[{{"kind":["bin"],"name":"foo","src_path":"src/foo.rs","metadata":null}}],"manifest_path":"{}/Cargo.toml"}}]}}
+"#, p.root().to_str().unwrap())));
+});
+
+test!(cargo_metadata_with_invalid_manifest {
+    let p = project("foo")
+            .file("Cargo.toml", "");
+
+    assert_that(p.cargo_process("metadata"),
+    execs()
+            .with_status(101)
+            .with_stderr("\
+failed to parse manifest at `[..]`
+
+Caused by:
+  No `package` or `project` section found.
+"))
+});
+
+test!(cargo_metadata_simple_file {
+    let p = project("foo")
+            .file("Cargo.toml", &basic_bin_manifest("foo"));
+
+    assert_that(p.cargo_process("metadata").arg("--output-path").arg("metadata.toml"), execs().with_status(0));
+
+    let outputfile = p.root().join("metadata.toml");
+    assert_that(&outputfile, existing_file());
+
+    let mut output = String::new();
+    File::open(&outputfile).unwrap().read_to_string(&mut output).unwrap();
+
+    assert_that(output, is(equal_to(format!(r#"
+[[packages]]
+dependencies = []
+manifest_path = "{}/Cargo.toml"
+name = "foo"
+version = "0.5.0"
+
+[[packages.targets]]
+kind = ["bin"]
+name = "foo"
+src_path = "src/foo.rs"
+
+[root]
+name = "foo"
+version = "0.5.0"
+"#, p.root().to_str().unwrap()))));
+});

tests/tests.rs

@@ -43,6 +43,7 @@ mod test_cargo_fetch;
 mod test_cargo_freshness;
 mod test_cargo_generate_lockfile;
 mod test_cargo_new;
+mod test_cargo_metadata;
 mod test_cargo_package;
 mod test_cargo_profiles;
 mod test_cargo_publish;