Update report path to match new package structure

In PR #545 we've merged the nodejs-ext package into the nodejs package.
This change moved some files around, and moved the extension install
scripts one level deeper into the `extension` subdirectory. Update the
report path name generation to match the new depth of the file.

Previously: `packages/nodejs-ext/scripts/extension.js`
New: `packages/nodejs/scripts/extension/extension.js`

It's interesting that no tests failed because of this. I think it's not
caught in the diagnose_tests, because we stub the install report.

I've now added a simple test to test the presence of the report, and not
a parsing error that occurs when no file could be read or there was a
problem reading the file. I'm struggling with Jest's mock system to
write a test for this and I'd rather look at it when addressing issue
#550 that updates the path location, which makes it easier to stub I
hope.

packages/nodejs/.changesets/fix-install-report-path-name-generation.md

@@ -0,0 +1,6 @@
+---
+bump: "patch"
+type: "fix"
+---
+
+Fix install report path name generation. This fixes the diagnose report not being able to find the path where the install report is stored.

packages/nodejs/scripts/extension/report.js

@@ -82,7 +82,7 @@ function createDownloadReport(report) {
 function reportPath() {
   // Navigate up to the app dir. Move up the scripts dir, package dir,
   // @appsignal dir and node_modules dir.
-  const appPath = path.join(__dirname, "../../../../")
+  const appPath = path.join(__dirname, "../../../../../")
   const hash = crypto.createHash("sha256")
   hash.update(appPath)
   const reportPathDigest = hash.digest("hex")

packages/nodejs/src/__tests__/diagnose.test.ts

@@ -30,6 +30,20 @@ describe("DiagnoseTool", () => {
     expect(output.process.uid).toEqual(process.getuid())
   })
 
+  describe("install report", () => {
+    it("fetches the install report", async () => {
+      const output = await tool.generate()
+
+      const install = output.installation
+      expect(install).not.toHaveProperty("parsing_error")
+      expect(install).toHaveProperty("build")
+      expect(install).toHaveProperty("download")
+      expect(install).toHaveProperty("host")
+      expect(install).toHaveProperty("language")
+      expect(install).toHaveProperty("result")
+    })
+  })
+
   it("returns the log_dir_path", async () => {
     const report = await tool.generate()
     expect(report.paths.log_dir_path.path).toEqual("/tmp")