Add ui_test_harness binary implementation

Adds ability to run UI components isolated from main app.

`cargo run --bin ui_test_harness -- AccountLoginView`

Signed-off-by: kernelkind <kernelkind@gmail.com>

src/tests_ui/main.rs

@@ -0,0 +1,34 @@
+mod account_login_view_test;
+mod egui_test_setup;
+use account_login_view_test::AccountLoginTest;
+use egui_test_setup::{EguiTestCase, EguiTestSetup};
+use notedeck::app_creation::generate_native_options;
+use std::env;
+
+fn run_test_app<F, T, O>(create_supr: F, create_child: O)
+where
+    F: 'static + FnOnce(&eframe::CreationContext<'_>) -> EguiTestSetup,
+    T: 'static + EguiTestCase,
+    O: 'static + FnOnce(EguiTestSetup) -> T,
+{
+    tracing_subscriber::fmt::init();
+
+    let _ = eframe::run_native(
+        "UI Test Harness",
+        generate_native_options(),
+        Box::new(|cc| Box::new(create_child(create_supr(cc)))),
+    );
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() > 1 {
+        match args[1].as_str() {
+            "AccountLoginView" => run_test_app(EguiTestSetup::new, AccountLoginTest::new),
+            _ => println!("Component not found."),
+        }
+    } else {
+        println!("Please specify a component to test.");
+    }
+}