test: fix svelte-check warnings

tests/Breakpoint.test.svelte

@@ -1,7 +1,8 @@
 <script lang="ts">
   import { Breakpoint } from "../types";
+  import { BreakpointSize } from "../types/Breakpoint/Breakpoint";
 
-  let size;
+  let size: BreakpointSize;
 </script>
 
 <Breakpoint

tests/CodeSnippet.test.svelte

@@ -35,7 +35,7 @@ export function subtract(a: number, b: number) {
   hideCloseButton
 />
 
-<CodeSnippet copy="{(text) => {}}"
+<CodeSnippet copy="{(text) => text}"
   >yarn add -D carbon-components-svelte</CodeSnippet
 >
 

tests/CopyButton.test.svelte

@@ -6,6 +6,6 @@
   text="text"
   on:click
   on:copy
-  copy="{(text) => {}}"
+  copy="{(text) => text}"
   feedback="Copied to clipboard"
 />

tests/Modal.test.svelte

@@ -12,7 +12,10 @@
   primaryButtonText="Confirm"
   secondaryButtons="{[{ text: 'Cancel' }, { text: 'Duplicate' }]}"
   secondaryButtonText="Cancel"
-  on:click:button--secondary="{({ detail }) => (open = false)}"
+  on:click:button--secondary="{({ detail }) => {
+    console.log(detail);
+    open = false;
+  }}"
   on:open
   on:close
   on:submit