From 914f300640ee3f49a54aea0e9aa71beea599f199 Mon Sep 17 00:00:00 2001
From: Eric Liu <ericyl.us@gmail.com>
Date: Sun, 9 Mar 2025 15:23:01 -0700
Subject: [PATCH] test(button): add unit tests

---
 tests/Button.test.svelte        |  61 ------------------
 tests/Button/Button.test.svelte |  45 +++++++++++++
 tests/Button/Button.test.ts     | 109 ++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+), 61 deletions(-)
 delete mode 100644 tests/Button.test.svelte
 create mode 100644 tests/Button/Button.test.svelte
 create mode 100644 tests/Button/Button.test.ts

diff --git a/tests/Button.test.svelte b/tests/Button.test.svelte
deleted file mode 100644
index 49bdcdbb..00000000
--- a/tests/Button.test.svelte
+++ /dev/null
@@ -1,61 +0,0 @@
-<script lang="ts">
-  import { Button } from "carbon-components-svelte";
-  import Add from "carbon-icons-svelte/lib/Add.svelte";
-</script>
-
-<Button data-test-id="btn">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={Add}>With icon</Button>
-
-<Button
-  icon={Add}
-  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" />
diff --git a/tests/Button/Button.test.svelte b/tests/Button/Button.test.svelte
new file mode 100644
index 00000000..755763b6
--- /dev/null
+++ b/tests/Button/Button.test.svelte
@@ -0,0 +1,45 @@
+<script lang="ts">
+  import { Button } from "carbon-components-svelte";
+  import Add from "carbon-icons-svelte/lib/Add.svelte";
+</script>
+
+<Button>primary</Button>
+<Button kind="secondary">secondary</Button>
+<Button kind="tertiary">tertiary</Button>
+<Button kind="ghost">ghost</Button>
+<Button kind="danger">danger</Button>
+<Button kind="danger-tertiary">danger-tertiary</Button>
+<Button kind="danger-ghost">danger-ghost</Button>
+
+<Button size="field">field size</Button>
+<Button size="small">small size</Button>
+
+<Button
+  icon={Add}
+  tooltipPosition="bottom"
+  tooltipAlignment="center"
+  iconDescription="Tooltip text"
+/>
+
+<Button href="#">Link button</Button>
+
+<Button as let:props>
+  <p {...props}>Custom element</p>
+</Button>
+
+<Button disabled>Disabled button</Button>
+
+<Button icon={Add}>With icon</Button>
+
+<Button
+  data-testid="btn"
+  on:click={() => {
+    console.log("click");
+  }}
+>
+  Test button
+</Button>
+
+<Button skeleton />
+<Button skeleton size="field" />
+<Button skeleton size="small" />
diff --git a/tests/Button/Button.test.ts b/tests/Button/Button.test.ts
new file mode 100644
index 00000000..63634037
--- /dev/null
+++ b/tests/Button/Button.test.ts
@@ -0,0 +1,109 @@
+import { render, screen } from "@testing-library/svelte";
+import { user } from "../setup-tests";
+import Button from "./Button.test.svelte";
+
+describe("Button", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("should render with various kinds", () => {
+    render(Button);
+
+    const kinds = [
+      "primary",
+      "secondary",
+      "tertiary",
+      "ghost",
+      "danger",
+      "danger-tertiary",
+      "danger-ghost",
+    ];
+
+    kinds.forEach((kind) => {
+      const button = screen.getByText(kind);
+      expect(button.closest("button")).toHaveClass(`bx--btn--${kind}`);
+    });
+  });
+
+  it("should render with different sizes", () => {
+    render(Button);
+
+    const sizes = {
+      field: "bx--btn--field",
+      small: "bx--btn--sm",
+    };
+
+    for (const [size, className] of Object.entries(sizes)) {
+      const buttons = screen.getAllByText(new RegExp(`${size}`, "i"));
+      buttons.forEach((button) => {
+        expect(button.closest("button")).toHaveClass(className);
+      });
+    }
+  });
+
+  it("should render icon-only button with tooltip", () => {
+    render(Button);
+
+    const iconButton = screen.getByText("Tooltip text").parentElement;
+    assert(iconButton);
+    expect(iconButton).toHaveClass("bx--btn--icon-only");
+    expect(iconButton).toHaveClass("bx--tooltip__trigger");
+    expect(iconButton).toHaveClass("bx--tooltip--a11y");
+    expect(iconButton).toHaveClass("bx--btn--icon-only--bottom");
+    expect(iconButton).toHaveClass("bx--tooltip--align-center");
+  });
+
+  it("should render as link when href is provided", () => {
+    render(Button);
+
+    const linkButton = screen.getByText("Link button");
+    expect(linkButton.tagName).toBe("A");
+    expect(linkButton).toHaveAttribute("href", "#");
+  });
+
+  it("should render custom element when as prop is used", () => {
+    render(Button);
+
+    const customButton = screen.getByText("Custom element");
+    expect(customButton.tagName).toBe("P");
+    expect(customButton).toHaveClass("bx--btn");
+  });
+
+  it("should render disabled state", () => {
+    render(Button);
+
+    const disabledButton = screen.getByText("Disabled button");
+    expect(disabledButton).toBeDisabled();
+    expect(disabledButton).toHaveClass("bx--btn--disabled");
+  });
+
+  it("should render skeleton state", () => {
+    render(Button);
+
+    const skeletons = document.querySelectorAll(".bx--skeleton");
+    expect(skeletons).toHaveLength(3);
+
+    skeletons.forEach((skeleton) => {
+      expect(skeleton).toHaveClass("bx--btn");
+    });
+  });
+
+  it("should handle click events", async () => {
+    const consoleLog = vi.spyOn(console, "log");
+    render(Button);
+
+    const button = screen.getByTestId("btn");
+    await user.click(button);
+    expect(consoleLog).toHaveBeenCalledWith("click");
+    expect(consoleLog).toHaveBeenCalledTimes(1);
+  });
+
+  it("should render with icon", () => {
+    render(Button);
+
+    const buttonWithIcon = screen.getByText("With icon");
+    const icon = buttonWithIcon.querySelector(".bx--btn__icon");
+    expect(icon).toBeInTheDocument();
+  });
+});