test(number-input): add unit tests

tests/NumberInput/NumberInput.test.svelte

@@ -0,0 +1,59 @@
+<script lang="ts">
+  import { NumberInput } from "carbon-components-svelte";
+  import type { ComponentProps } from "svelte";
+
+  export let value: ComponentProps<NumberInput>["value"] = 0;
+  export let step: ComponentProps<NumberInput>["step"] = 1;
+  export let min: ComponentProps<NumberInput>["min"] = undefined;
+  export let max: ComponentProps<NumberInput>["max"] = undefined;
+  export let size: ComponentProps<NumberInput>["size"] = undefined;
+  export let light = false;
+  export let readonly = false;
+  export let allowEmpty = false;
+  export let disabled = false;
+  export let hideSteppers = false;
+  export let iconDescription = "";
+  export let invalid = false;
+  export let invalidText = "";
+  export let warn = false;
+  export let warnText = "";
+  export let helperText = "";
+  export let label = "Clusters";
+  export let hideLabel = false;
+  export let id = "ccs-test";
+  export let name: ComponentProps<NumberInput>["name"] = undefined;
+  export let ref: ComponentProps<NumberInput>["ref"] = null;
+</script>
+
+<NumberInput
+  bind:value
+  {step}
+  {min}
+  {max}
+  {size}
+  {light}
+  {readonly}
+  {allowEmpty}
+  {disabled}
+  {hideSteppers}
+  {iconDescription}
+  {invalid}
+  {invalidText}
+  {warn}
+  {warnText}
+  {helperText}
+  {label}
+  {hideLabel}
+  {id}
+  {name}
+  {ref}
+  on:change
+  on:input
+  on:keydown
+  on:keyup
+  on:focus
+  on:blur
+  on:paste
+/>
+
+<div data-testid="value">{value}</div>