Add insta testing, particularly private assets (outside of git repo)

Author: realcundo

.gitignore

@@ -1,2 +1,4 @@
 /target
 .idea
+/tests/assets/private/**/*
+/tests/snapshots/private/**/*

Cargo.lock

@@ -28,6 +28,11 @@ nu-protocol = { version = "0.107.0", features = ["plugin"] }
 nu-plugin-test-support = "0.107.0"
 nu-command = "0.107.0"
 test-case = "3"
+insta = { version = "1.43", default-features = false, features = ["glob", "ron"] }
+
+[profile.dev.package]
+insta.opt-level = 3
+similar.opt-level = 3
 
 [profile.release]
 lto = true

Cargo.toml

@@ -0,0 +1,28 @@
+use crate::test_utils::get_asset_base_path;
+use insta::{assert_ron_snapshot, glob};
+use nu_protocol::Span;
+use test_utils::setup_plugin_for_test;
+
+mod test_utils;
+
+#[test]
+fn private_assets() -> Result<(), nu_protocol::ShellError> {
+    let mut plugin_test = setup_plugin_for_test(vec![Box::new(nu_command::Open)])?;
+    let asset_path = get_asset_base_path().join("private");
+
+    glob!(asset_path, "**/*.dcm", |path| {
+        let command = format!("open --raw {} | dcm", path.to_string_lossy());
+
+        let result = plugin_test
+            .eval(&command)
+            .expect("failed to evaluate command")
+            .into_value(Span::test_data())
+            .expect("failed to convert to value");
+
+        insta::with_settings!({sort_maps => true, snapshot_path => "snapshots/private" }, {
+            assert_ron_snapshot!(result);
+        });
+    });
+
+    Ok(())
+}