add test for subcommand parsing (texitoi/structopt#1)

tests/subcommands.rs

@@ -0,0 +1,57 @@
+// Copyright (c) 2017 Guillaume Pinot <texitoi(a)texitoi.eu>
+//
+// This work is free. You can redistribute it and/or modify it under
+// the terms of the Do What The Fuck You Want To Public License,
+// Version 2, as published by Sam Hocevar. See the COPYING file for
+// more details.
+
+extern crate structopt;
+#[macro_use] extern crate structopt_derive;
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, PartialEq, Debug)]
+enum Opt {
+    #[structopt(name = "fetch")]
+    Fetch {
+        #[structopt(long = "all")]
+        all: bool,
+        #[structopt(short = "f", long = "force")]
+        /// Overwrite local branches.
+        force: bool,
+        repo: String
+    },
+    
+    #[structopt(name = "add")]
+    Add {
+        #[structopt(short = "i", long = "interactive")]
+        interactive: bool,
+        #[structopt(short = "v", long = "verbose")]
+        verbose: bool
+    }
+}
+
+#[test]
+fn test_fetch() {
+    assert_eq!(Opt::Fetch { all: true, force: false, repo: "origin".to_string() },
+               Opt::from_clap(Opt::clap().get_matches_from(&["test", "fetch", "--all", "origin"])));
+    assert_eq!(Opt::Fetch { all: false, force: true, repo: "origin".to_string() },
+               Opt::from_clap(Opt::clap().get_matches_from(&["test", "fetch", "-f", "origin"])));
+}
+
+#[test]
+fn test_add() {
+    assert_eq!(Opt::Add { interactive: false, verbose: false },
+               Opt::from_clap(Opt::clap().get_matches_from(&["test", "add"])));
+    assert_eq!(Opt::Add { interactive: true, verbose: true },
+               Opt::from_clap(Opt::clap().get_matches_from(&["test", "add", "-i", "-v"])));
+}
+
+#[test]
+fn test_no_parse() {
+    let result = Opt::clap().get_matches_from_safe(&["test", "badcmd", "-i", "-v"]);
+    assert!(result.is_err());
+
+    let result = Opt::clap().get_matches_from_safe(&["test", "add", "--badoption"]);
+    assert!(result.is_err());
+}