test: Add a failing test case for #242

tests/all/build.rs

@@ -0,0 +1,18 @@
+use structopt::StructOpt;
+use utils;
+use wasm_pack::{command, logger, Cli};
+
+#[test]
+fn build_in_non_crate_directory_doesnt_panic() {
+    let fixture = utils::fixture::fixture("tests/fixtures/not-a-crate");
+    let cli = Cli::from_iter_safe(vec![
+        "wasm-pack",
+        "build",
+        &fixture.path.display().to_string(),
+    ]).unwrap();
+    let logger = logger::new(&cli.cmd, cli.verbosity).unwrap();
+    assert!(
+        command::run_wasm_pack(cli.cmd, &logger).is_err(),
+        "running wasm-pack in a non-crate directory should fail, but it should not panic"
+    );
+}

tests/all/main.rs

@@ -3,9 +3,11 @@ extern crate failure;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
+extern crate structopt;
 extern crate tempfile;
 extern crate wasm_pack;
 
+mod build;
 mod manifest;
 mod readme;
 mod utils;

tests/fixtures/not-a-crate/README.md

@@ -0,0 +1 @@
+This is not a Rust crate!