Add graphql tests to CI, move snapshots to fixures, use mockdate

Author: rmosolgo

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        test-group: [content, meta, rendering, routing, unit, links-and-images]
+        test-group: [content, meta, rendering, routing, unit, links-and-images, graphql]
     steps:
       # Each of these ifs needs to be repeated at each step to make sure the required check still runs
       # Even if if doesn't do anything

package-lock.json

@@ -58,6 +58,7 @@
     "lodash": "^4.17.19",
     "mini-css-extract-plugin": "^0.9.0",
     "mkdirp": "^1.0.3",
+    "mockdate": "^3.0.2",
     "morgan": "^1.9.1",
     "node-fetch": "^2.6.1",
     "platform-utils": "^1.2.0",

package.json

@@ -0,0 +1,31 @@
+{
+  "previewChanges": [
+    {
+      "changes": [
+        "Field `Query.previewField` changed type from `PreviewType` to `PreviewType!`",
+        "Type for argument `changeTypeArgument` on field 'PreviewType.field1` changed from `Int` to `Float'"
+      ],
+      "title": "The [Test preview](/graphql/overview/schema-previews#test-preview) includes these changes:"
+    }
+  ],
+  "schemaChanges": [
+    {
+      "changes": [
+        "Field `removedField` was removed from object type `Query`",
+        "Type for argument `argumentMadeRequired` on field `Query.argumentsField` changed from `Int` to `Int!`",
+        "Type for argument `argumentMadeOptional` on field `Query.argumentsField` changed from `Int!` to `Int`",
+        "Argument `removedRequiredArgument: Int!` was removed from field `Query.argumentsField`",
+        "Argument `removedOptionalArgument: Int!` was removed from field `Query.argumentsField`"
+      ],
+      "title": "The GraphQL schema includes these changes:"
+    }
+  ],
+  "upcomingChanges": [
+    {
+      "changes": [
+        "On member `Query.stableField`:`stableField` will be removed. **Effective 2021-06-01**."
+      ],
+      "title": "The following changes will be made to the schema:"
+    }
+  ]
+}

tests/fixtures/changelog-entry.json

@@ -0,0 +1,12 @@
+[
+  {
+    "someStuff": true,
+    "date": "2020-11-20"
+  },
+  {
+    "previous_entry": "..."
+  },
+  {
+    "another_previous_entry": "..."
+  }
+]

tests/fixtures/updated-changelog-file.json

@@ -1,8 +1,15 @@
 const yaml = require('js-yaml')
 const { createChangelogEntry, cleanPreviewTitle, previewAnchor, prependDatedEntry } = require('../../script/graphql/build-changelog')
 const fs = require('fs')
+const MockDate = require("mockdate")
+const expectedChangelogEntry = require('../fixtures/changelog-entry')
+const expectedUpdatedChangelogFile = require('../fixtures/updated-changelog-file')
 
 describe('creating a changelog from old schema and new schema', () => {
+  afterEach(() => {
+    MockDate.reset()
+  })
+
   it('finds a diff of schema changes, upcoming changes, and preview changes', async () => {
     const oldSchemaString = `
     type PreviewType {
@@ -68,7 +75,7 @@ upcoming_changes:
 `).upcoming_changes
 
     const entry = await createChangelogEntry(oldSchemaString, newSchemaString, previews, oldUpcomingChanges, newUpcomingChanges)
-    expect(entry).toMatchSnapshot()
+    expect(entry).toEqual(expectedChangelogEntry)
   })
 
   it('returns null when there isnt any difference', async () => {
@@ -100,18 +107,25 @@ describe('Preparing preview links', () => {
 })
 
 describe('updating the changelog file', () => {
+  afterEach(() => {
+    MockDate.reset()
+  })
+
   it('modifies the entry object and the file on disk', () => {
     const testTargetPath = 'tests/graphql/example_changelog.json'
     const previousContents = fs.readFileSync(testTargetPath)
 
     const exampleEntry = { someStuff: true }
+    const expectedDate = "2020-11-20"
+    MockDate.set(expectedDate)
+
     prependDatedEntry(exampleEntry, testTargetPath)
     const newContents = fs.readFileSync(testTargetPath, 'utf8')
     // reset the file:
     fs.writeFileSync(testTargetPath, previousContents)
 
-    const expectedDate = (new Date()).toISOString().split('T')[0]
+
     expect(exampleEntry).toEqual({ someStuff: true, date: expectedDate })
-    expect(newContents).toMatchSnapshot()
+    expect(JSON.parse(newContents)).toEqual(expectedUpdatedChangelogFile)
   })
 })