chore: add tests for image ef

Author: ascorbic

packages/runtime/src/helpers/edge.ts

@@ -206,7 +206,12 @@ export const writeEdgeFunctions = async (netlifyConfig: NetlifyConfig) => {
   await copy(getEdgeTemplatePath('../edge-shared'), join(edgeFunctionRoot, 'edge-shared'))
   await writeJSON(join(edgeFunctionRoot, 'edge-shared', 'nextConfig.json'), nextConfig)
 
-  if (!process.env.NEXT_DISABLE_EDGE_IMAGES) {
+  if (
+    process.env.NEXT_DISABLE_EDGE_IMAGES !== '1' &&
+    process.env.NEXT_DISABLE_EDGE_IMAGES !== 'true' &&
+    process.env.NEXT_DISABLE_NETLIFY_EDGE !== 'true' &&
+    process.env.NEXT_DISABLE_NETLIFY_EDGE !== '1'
+  ) {
     console.log(
       'Using Netlify Edge Functions for image format detection. Set env var "NEXT_DISABLE_EDGE_IMAGES=true" to disable.',
     )

test/index.js

@@ -571,6 +571,29 @@ describe('onBuild()', () => {
       'X-Foo': mockHeaderValue,
     })
   })
+
+  test('generates an ipx edge function by default', async () => {
+    await moveNextDist()
+    await nextRuntime.onBuild(defaultArgs)
+    expect(existsSync(path.join('.netlify', 'edge-functions', 'ipx', 'index.ts'))).toBeTruthy()
+  })
+
+  test('does not generate an ipx edge function if the feature is disabled', async () => {
+    process.env.NEXT_DISABLE_EDGE_IMAGES = '1'
+    await moveNextDist()
+    await nextRuntime.onBuild(defaultArgs)
+    expect(existsSync(path.join('.netlify', 'edge-functions', 'ipx', 'index.ts'))).toBeFalsy()
+    delete process.env.NEXT_DISABLE_EDGE_IMAGES
+  })
+
+  test('does not generate an ipx edge function if Netlify Edge is disabled', async () => {
+    process.env.NEXT_DISABLE_NETLIFY_EDGE = '1'
+    await moveNextDist()
+    await nextRuntime.onBuild(defaultArgs)
+
+    expect(existsSync(path.join('.netlify', 'edge-functions', 'ipx', 'index.ts'))).toBeFalsy()
+    delete process.env.NEXT_DISABLE_NETLIFY_EDGE
+  })
 })
 
 describe('onPostBuild', () => {