Add test for transformer-remark

packages/gatsby-transformer-remark/__tests__/__snapshots__/gatsby-node.js.snap

@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Process markdown content correctly Correctly creates a new MarkdownRemark node 1`] = `
+Array [
+  Array [
+    Object {
+      "children": Array [],
+      "content": "
+Where oh where is my little pony?
+    ",
+      "contentDigest": "54cfa2ad99756f2fa232cac585280a37",
+      "frontmatter": Object {
+        "date": "12/12/2014",
+        "parent": "whatever",
+        "title": "my little pony",
+      },
+      "id": "whatever >>> MarkdownRemark",
+      "mediaType": "text/x-markdown",
+      "parent": "whatever",
+      "type": "MarkdownRemark",
+    },
+  ],
+]
+`;
+
+exports[`Process markdown content correctly Correctly creates a new MarkdownRemark node 2`] = `
+Array [
+  Array [
+    Object {
+      "children": Array [
+        "whatever >>> MarkdownRemark",
+      ],
+      "content": "---
+title: \\"my little pony\\"
+date: \\"12/12/2014\\"
+---
+
+Where oh where is my little pony?
+    ",
+      "contentDigest": "whatever",
+      "id": "whatever",
+      "mediaType": "text/x-markdown",
+    },
+  ],
+]
+`;

packages/gatsby-transformer-remark/__tests__/gatsby-node.js

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+const Promise = require("bluebird")
+
+const { onNodeCreate } = require("../src/gatsby-node")
+
+describe(`Process markdown content correctly`, () => {
+  const node = {
+    id: "whatever",
+    contentDigest: "whatever",
+    mediaType: `text/x-markdown`,
+    children: [],
+  }
+
+  // Make some fake functions its expecting.
+  const loadNodeContent = node => {
+    return Promise.resolve(node.content)
+  }
+
+  it(`Correctly creates a new MarkdownRemark node`, async () => {
+    const content = `---
+title: "my little pony"
+date: "12/12/2014"
+---
+
+Where oh where is my little pony?
+    `
+    node.content = content
+
+    const createNode = jest.fn()
+    const updateNode = jest.fn()
+    const boundActionCreators = { createNode, updateNode }
+
+    await onNodeCreate({
+      node,
+      loadNodeContent,
+      boundActionCreators,
+    }).then(() => {
+      expect(createNode.mock.calls).toMatchSnapshot()
+      expect(updateNode.mock.calls).toMatchSnapshot()
+      expect(createNode).toHaveBeenCalledTimes(1)
+      expect(updateNode).toHaveBeenCalledTimes(1)
+    })
+  })
+})