test(command/build): add test for fix-390

tests/all/build.rs

@@ -20,3 +20,24 @@ fn build_in_non_crate_directory_doesnt_panic() {
     let err_msg = result.unwrap_err().to_string();
     assert!(err_msg.contains("missing a `Cargo.toml`"));
 }
+
+#[cfg(target_os = "windows")]
+#[test]
+fn it_format_out_dir_on_windows() {
+    let fixture = utils::fixture::js_hello_world();
+    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();
+    let result = command::run_wasm_pack(cli.cmd, &logger);
+    assert!(result.is_ok(), "js_hello_world example should pass");
+
+    let wasm_pack_log = utils::file::read_file(&fixture.path.join("wasm-pack.log")).unwrap();
+    assert!(
+        wasm_pack_log.contains(r"Your wasm pkg is ready to publish at \\?\C:\Users\"),
+        "directories in wasm-pack.log should be well formatted",
+    );
+}