test(modal): update modal type tests

tests/ComposedModal.test.svelte

@@ -10,7 +10,7 @@
   let checked = false;
 </script>
 
-<ComposedModal open>
+<ComposedModal open on:close on:click:button--primary>
   <ModalHeader title="Confirm changes" />
   <ModalBody hasForm>
     <Checkbox labelText="I have reviewed the changes" bind:checked />
@@ -19,6 +19,8 @@
     primaryButtonText="Proceed"
     primaryButtonDisabled="{!checked}"
     secondaryButtons="{[{ text: 'Cancel' }, { text: 'Duplicate' }]}"
-    on:click:button--secondary="{({ detail }) => {}}"
+    on:click:button--secondary="{({ detail }) => {
+      console.log(detail);
+    }}"
   />
 </ComposedModal>

tests/Modal.test.svelte

@@ -16,6 +16,7 @@
   on:open
   on:close
   on:submit
+  on:click:button--primary
 >
   <p>Create a new Cloudant database in the US South region.</p>
 </Modal>