first pass of merging in warp (doesn't build)

app/src/app_id_tests.rs

@@ -0,0 +1,23 @@
+use super::*;
+
+#[test]
+fn test_parse_valid_app_id() {
+    let app_id_string = "com.example.App";
+    let app_id = AppId::parse(app_id_string).expect("should not fail to parse");
+    assert_eq!(app_id.qualifier(), "com");
+    assert_eq!(app_id.organization(), "example");
+    assert_eq!(app_id.application_name(), "App");
+    assert_eq!(app_id_string, &app_id.to_string());
+}
+
+#[test]
+fn test_parse_invalid_app_id() {
+    assert!(
+        AppId::parse("com.example").is_err(),
+        "should fail to parse two-part app ID string"
+    );
+    assert!(
+        AppId::parse("com.example.App.Blah").is_err(),
+        "should fail to parse four-part app ID string"
+    );
+}