chore: add tests to static-query filepaths

packages/gatsby/src/utils/__tests__/map-templates-to-static-query-hashes.js

@@ -0,0 +1,78 @@
+import path from "path"
+import { slash } from "gatsby-core-utils"
+import mapTemplatesToStaticQueryHashes from "../map-templates-to-static-query-hashes"
+
+const page1 = slash(`${process.cwd()}/src/pages/index.js`)
+const page2 = slash(`${process.cwd()}/src/pages/pages-2.js`)
+const components = new Map()
+components.set(page1, {
+  componentPath: page1,
+  query: ``,
+  pages: new Set([`/`]),
+})
+
+components.set(page2, {
+  componentPath: page2,
+  query: ``,
+  pages: new Set([`/`]),
+})
+
+const staticQueryComponents = new Map()
+staticQueryComponents.set(`sq--src-components-image-js`, {
+  id: `sq--src-components-image-js`,
+  componentPath: slash(`${process.cwd()}/src/components/image.js`),
+  query: `query { placeholderImage: file(relativePath: {eq: "gatsby-astronaut.png"}) { public { publicUrl } } }`,
+  hash: 1,
+})
+staticQueryComponents.set(`sq--src-components-seo-js`, {
+  id: `sq--src-components-seo-js`,
+  componentPath: slash(`${process.cwd()}/src/components/seo.js`),
+  query: `query { site { siteMetadata { title } } }`,
+  hash: 2,
+})
+
+const createModule = (resource, reasons = []) => {
+  return {
+    hasReasons: () => !!reasons.length,
+    identifier: () => resource,
+    resource: path.join(process.cwd(), resource),
+    reasons: reasons.map(r => {
+      return {
+        module: r,
+      }
+    }),
+  }
+}
+
+describe(`map-templates-to-static-query-hashes`, () => {
+  it(`should map static-queries to a component file on all platforms`, () => {
+    const asyncRequires = createModule(
+      `_this_is_virtual_fs_path_/$virtual/async-requires.js`
+    )
+
+    const templateMap = mapTemplatesToStaticQueryHashes(
+      {
+        components,
+        staticQueryComponents,
+      },
+      {
+        modules: [
+          createModule(`src/components/layout.js`, [
+            createModule(`src/pages/index.js`, [asyncRequires]),
+            createModule(`src/pages/pages-2.js`, [asyncRequires]),
+          ]),
+          createModule(`src/components/image.js`, [
+            createModule(`src/pages/index.js`, [asyncRequires]),
+          ]),
+          createModule(`src/components/seo.js`, [
+            createModule(`src/pages/pages-2.js`, [asyncRequires]),
+          ]),
+        ],
+      }
+    )
+
+    expect(templateMap.size).toBe(2)
+    expect(templateMap.get(page1)).toEqual([`1`])
+    expect(templateMap.get(page2)).toEqual([`2`])
+  })
+})