adds tests

web/src/lib/components/base/button.svelte

@@ -8,7 +8,8 @@
     export let large: boolean = false;
     export let loading: boolean = false;
     export let disabled: boolean = false;
-    export let tooltip: string = "";
+    export let tooltip: string | undefined = undefined;
+    export let id: string | undefined = undefined
 </script>
 
 <button
@@ -18,10 +19,11 @@
     class:btn-large={large}
     class:btn-disabled={disabled || loading}
     disabled={disabled || loading}
-    class:tooltip={tooltip.length > 0}
+    class:tooltip={(tooltip?.length ?? 0) > 0}
     data-title={tooltip}
     on:click
     {type}
+    {id}
 >
     <div class:invisible={loading}>
         {#if icon}