migrate markdown 404 page test case to markdown plugin

Author: thescientist13

packages/plugin-markdown/src/index.js

@@ -11,11 +11,13 @@ import { unified } from "unified";
 // https://github.com/ProjectEvergreen/greenwood/issues/1278
 let allHeadingsTracked = false;
 
+const PLUGIN_EXTENSION = ".md";
+
 async function trackAllTocHeadings(compilation) {
   for (const idx in compilation.graph) {
     const page = compilation.graph[idx];
 
-    if (page.pageHref.endsWith(".md")) {
+    if (page?.pageHref?.endsWith(PLUGIN_EXTENSION)) {
       const markdownContents = await fs.readFile(new URL(page.pageHref), "utf-8");
 
       let tocData = {};
@@ -47,7 +49,7 @@ async function trackAllTocHeadings(compilation) {
 class MarkdownResource {
   constructor(compilation, options = {}) {
     this.compilation = compilation;
-    this.extensions = [".md"];
+    this.extensions = [PLUGIN_EXTENSION];
     this.contentType = "text/html";
     this.servePage = "static";
     this.options = options;
@@ -60,6 +62,7 @@ class MarkdownResource {
     return (
       protocol.startsWith("http") &&
       hasMatchingPageRoute &&
+      hasMatchingPageRoute.pageHref &&
       hasMatchingPageRoute.pageHref.endsWith(this.extensions[0])
     );
   }

…d.default.workspace-404-markdown.spec.js …d.default.workspace-404-markdown.spec.jspackages/cli/test/cases/build.default.workspace-404-markdown/build.default.workspace-404-markdown.spec.js renamed to packages/plugin-markdown/test/cases/build.default.workspace-404-markdown/build.default.workspace-404-markdown.spec.js packages/cli/test/cases/build.default.workspace-404-markdown/build.default.workspace-404-markdown.spec.js renamed to packages/plugin-markdown/test/cases/build.default.workspace-404-markdown/build.default.workspace-404-markdown.spec.js

@@ -9,7 +9,9 @@
  * greenwood build
  *
  * User Config
- * None (Greenwood Default)
+ * {
+ *   plugins: [greenwoodPluginMarkdown()]
+ * }
  *
  * User Workspace
  * src/

packages/plugin-markdown/test/cases/build.default.workspace-404-markdown/greenwood.config.js

@@ -0,0 +1,5 @@
+import { greenwoodPluginMarkdown } from "../../../src/index.js";
+
+export default {
+  plugins: [greenwoodPluginMarkdown()],
+};