fix(app-shell): Fix flaky file system test (#17212)

Fix a flaky test by running filesystem commands sequentially instead of in parallel.

Author: mjhuff

app-shell/src/protocol-storage/__tests__/file-system.test.ts

@@ -109,66 +109,67 @@ describe('protocol storage directory utilities', () => {
   })
 
   describe('parseProtocolDirs', () => {
-    it('reads and parses directories', () => {
+    it('reads and parses directories', async () => {
       const protocolsDir = makeEmptyDir()
-
       const firstProtocolDirName = 'protocol_item_1'
       const secondProtocolDirName = 'protocol_item_2'
-
       const firstDirPath = path.join(protocolsDir, firstProtocolDirName)
       const secondDirPath = path.join(protocolsDir, secondProtocolDirName)
 
-      return Promise.all([
-        fs.emptyDir(path.join(protocolsDir, firstProtocolDirName)),
-        fs.emptyDir(path.join(protocolsDir, firstProtocolDirName, 'src')),
-        fs.createFile(
-          path.join(protocolsDir, firstProtocolDirName, 'src', 'main.py')
-        ),
-        fs.emptyDir(path.join(protocolsDir, firstProtocolDirName, 'analysis')),
-        fs.createFile(
-          path.join(
-            protocolsDir,
-            firstProtocolDirName,
-            'analysis',
-            'fake_timestamp0.json'
-          )
-        ),
-        fs.emptyDir(path.join(protocolsDir, secondProtocolDirName)),
-        fs.emptyDir(path.join(protocolsDir, secondProtocolDirName, 'src')),
-        fs.createFile(
-          path.join(protocolsDir, secondProtocolDirName, 'src', 'main.json')
-        ),
-        fs.emptyDir(path.join(protocolsDir, secondProtocolDirName, 'analysis')),
-        fs.createFile(
-          path.join(
-            protocolsDir,
-            secondProtocolDirName,
-            'analysis',
-            'fake_timestamp1.json'
-          )
-        ),
-      ]).then(() => {
-        return expect(
-          parseProtocolDirs([firstDirPath, secondDirPath])
-        ).resolves.toEqual([
-          {
-            dirPath: firstDirPath,
-            modified: expect.any(Number),
-            srcFilePaths: [path.join(firstDirPath, 'src', 'main.py')],
-            analysisFilePaths: [
-              path.join(firstDirPath, 'analysis', 'fake_timestamp0.json'),
-            ],
-          },
-          {
-            dirPath: secondDirPath,
-            modified: expect.any(Number),
-            srcFilePaths: [path.join(secondDirPath, 'src', 'main.json')],
-            analysisFilePaths: [
-              path.join(secondDirPath, 'analysis', 'fake_timestamp1.json'),
-            ],
-          },
-        ])
-      })
+      await fs.emptyDir(path.join(protocolsDir, firstProtocolDirName))
+      await fs.emptyDir(path.join(protocolsDir, firstProtocolDirName, 'src'))
+      await fs.emptyDir(
+        path.join(protocolsDir, firstProtocolDirName, 'analysis')
+      )
+      await fs.createFile(
+        path.join(protocolsDir, firstProtocolDirName, 'src', 'main.py')
+      )
+      await fs.createFile(
+        path.join(
+          protocolsDir,
+          firstProtocolDirName,
+          'analysis',
+          'fake_timestamp0.json'
+        )
+      )
+
+      await fs.emptyDir(path.join(protocolsDir, secondProtocolDirName))
+      await fs.emptyDir(path.join(protocolsDir, secondProtocolDirName, 'src'))
+      await fs.emptyDir(
+        path.join(protocolsDir, secondProtocolDirName, 'analysis')
+      )
+      await fs.createFile(
+        path.join(protocolsDir, secondProtocolDirName, 'src', 'main.json')
+      )
+      await fs.createFile(
+        path.join(
+          protocolsDir,
+          secondProtocolDirName,
+          'analysis',
+          'fake_timestamp1.json'
+        )
+      )
+
+      const result = await parseProtocolDirs([firstDirPath, secondDirPath])
+
+      expect(result).toEqual([
+        {
+          dirPath: firstDirPath,
+          modified: expect.any(Number),
+          srcFilePaths: [path.join(firstDirPath, 'src', 'main.py')],
+          analysisFilePaths: [
+            path.join(firstDirPath, 'analysis', 'fake_timestamp0.json'),
+          ],
+        },
+        {
+          dirPath: secondDirPath,
+          modified: expect.any(Number),
+          srcFilePaths: [path.join(secondDirPath, 'src', 'main.json')],
+          analysisFilePaths: [
+            path.join(secondDirPath, 'analysis', 'fake_timestamp1.json'),
+          ],
+        },
+      ])
     })
   })