test: add TS types

tests/Button.test.svelte

@@ -0,0 +1,62 @@
+<script lang="ts">
+  import { Button } from "../types";
+  import Add16 from "carbon-icons-svelte/lib/Add16";
+</script>
+
+<Button>Primary button</Button>
+
+<Button kind="secondary">Secondary button</Button>
+
+<Button kind="tertiary">Tertiary button</Button>
+
+<Button kind="ghost">Ghost button</Button>
+
+<Button kind="danger">Danger button</Button>
+
+<Button kind="danger-tertiary">Danger tertiary button</Button>
+
+<Button kind="danger-ghost">Danger ghost button</Button>
+
+<Button icon="{Add16}">With icon</Button>
+
+<Button
+  icon="{Add16}"
+  hasIconOnly
+  tooltipPosition="bottom"
+  tooltipAlignment="center"
+  iconDescription="Tooltip text"
+/>
+
+<Button href="#">Link button</Button>
+
+<Button as let:props>
+  <p {...props}>Custom element</p>
+</Button>
+
+<Button size="field">Primary</Button>
+
+<Button size="field" kind="secondary">Secondary</Button>
+
+<Button size="field" kind="tertiary">Tertiary</Button>
+
+<Button size="field" kind="ghost">Ghost</Button>
+
+<Button size="field" kind="danger">Danger</Button>
+
+<Button size="small">Primary</Button>
+
+<Button size="small" kind="secondary">Secondary</Button>
+
+<Button size="small" kind="tertiary">Tertiary</Button>
+
+<Button size="small" kind="ghost">Ghost</Button>
+
+<Button size="small" kind="danger">Danger</Button>
+
+<Button disabled>Disabled button</Button>
+
+<Button skeleton />
+
+<Button skeleton size="field" />
+
+<Button skeleton size="small" />