test(radio-button): add unit tests

tests/RadioButton/RadioButton.test.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+  import { RadioButton } from "carbon-components-svelte";
+  import type { ComponentProps } from "svelte";
+
+  export let value: ComponentProps<RadioButton>["value"] = "";
+  export let checked: ComponentProps<RadioButton>["checked"] = false;
+  export let disabled: ComponentProps<RadioButton>["disabled"] = false;
+  export let required: ComponentProps<RadioButton>["required"] = false;
+  export let labelPosition: ComponentProps<RadioButton>["labelPosition"] =
+    "right";
+  export let labelText: ComponentProps<RadioButton>["labelText"] = "Option 1";
+  export let hideLabel: ComponentProps<RadioButton>["hideLabel"] = false;
+  export let id: ComponentProps<RadioButton>["id"] = "ccs-test";
+  export let name: ComponentProps<RadioButton>["name"] = "test-group";
+  export let ref: ComponentProps<RadioButton>["ref"] = null;
+</script>
+
+<RadioButton
+  bind:value
+  {checked}
+  {disabled}
+  {required}
+  {labelPosition}
+  {labelText}
+  {hideLabel}
+  {id}
+  {name}
+  {ref}
+  on:change={() => {
+    console.log("change");
+  }}
+/>