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`<DSelect />` is a wrapper similar to our existing `<DButton />` over the html element `<select>`. The code is ported from form kit which is now directly using `<DSelect />`. Note this component has also been used in edit topic timer modal.
This component is recommended for a small list of text items (no icons, no rich formatting...).
Usage:
```gjs
<DSelect class="my-select" @onChange={{this.handleChange}} as |select|>
<select.Option @value="foo" class="my-favorite-option">Foo</select.Option>
<select.Option @value="bar">Bar</select.Option>
</DSelect>
```
This commit comes with a set of assertions:
```gjs
import dselect from "discourse/tests/helpers/d-select-helper";
import { select } from "@ember/test-helpers";
assert
.dselect(".my-select")
.hasOption({ value: "bar", label: "Bar" })
.hasOption({ value: "foo", label: "Foo" })
.hasNoOption("baz");
await select(".my-select", "foo");
assert.dselect(".my-select").hasSelectedOption({value: "foo", label: "Foo"});
```
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