test(slider): add unit tests

tests/Slider/Slider.test.svelte

@@ -0,0 +1,37 @@
+<script lang="ts">
+  import { Slider } from "carbon-components-svelte";
+
+  let value = 0;
+
+  export let disabled = false;
+  export let invalid = false;
+  export let required = false;
+  export let minLabel = "";
+  export let maxLabel = "";
+  export let hideTextInput = false;
+  export let fullWidth = false;
+  export let min = 0;
+  export let max = 100;
+  export let step = 1;
+</script>
+
+<Slider
+  bind:value
+  labelText="Test Slider"
+  {min}
+  {max}
+  {step}
+  {disabled}
+  {invalid}
+  {required}
+  {minLabel}
+  {maxLabel}
+  {hideTextInput}
+  {fullWidth}
+  on:change={(e) => {
+    console.log("change", e.detail);
+  }}
+  on:input={(e) => {
+    console.log("input", e.detail);
+  }}
+/>