chore: add tests

src/utils/markdown/markdown-it-regexp.spec.ts

@@ -0,0 +1,42 @@
+import MarkdownIt from "markdown-it"
+import { describe, expect, it } from "vitest"
+
+import { markdownItPlugin } from "./markdown-it-regexp"
+
+describe("markdownItPlugin", () => {
+  it("calls the replacer when the pattern matches at start of inline content", () => {
+    const plugin = markdownItPlugin(/@(\w+)/, (match) => {
+      return `<span class="mention">${match[1]}</span>`
+    })
+
+    const md = MarkdownIt().use(plugin)
+
+    expect(md.render("@alice posted a note")).toContain(
+      '<span class="mention">alice</span>'
+    )
+  })
+
+  it("leaves non-matching text untouched", () => {
+    const plugin = markdownItPlugin(/@(\w+)/, (match) => `MATCH:${match[1]}`)
+    const md = MarkdownIt().use(plugin)
+
+    expect(md.render("no mention here")).toBe("<p>no mention here</p>\n")
+  })
+
+  it("supports case-insensitive matching when the input regex has the i flag", () => {
+    const plugin = markdownItPlugin(/@hello/i, () => "<b>hi</b>")
+    const md = MarkdownIt().use(plugin)
+
+    expect(md.render("@HELLO world")).toContain("<b>hi</b>")
+  })
+
+  it("each plugin instance gets a unique rule id (no collisions)", () => {
+    const pluginA = markdownItPlugin(/@a/, () => "RULE_A")
+    const pluginB = markdownItPlugin(/@b/, () => "RULE_B")
+    const md = MarkdownIt().use(pluginA).use(pluginB)
+
+    const result = md.render("@a and @b")
+    expect(result).toContain("RULE_A")
+    expect(result).toContain("RULE_B")
+  })
+})