Fix iOS simulator tests not initializing the device correctly (#1039)

* Update integration_tests.yml

* Update integration_tests.yml

* Update test_simulator.py

Author: a-maurice

.github/workflows/integration_tests.yml

@@ -478,6 +478,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix: ${{ fromJson(needs.check_and_prepare.outputs.test_matrix) }}
+    env:
+      xcodeVersion: "15.1"
     steps:
       - id: matrix_info
         shell: bash
@@ -495,6 +497,9 @@ jobs:
         timeout-minutes: 10
         shell: bash
         run:  pip install -r scripts/gha/requirements.txt
+      - name: setup Xcode version
+        if: runner.os == 'macOS'
+        run: sudo xcode-select -s /Applications/Xcode_${{ env.xcodeVersion }}.app/Contents/Developer
       - name: Download Testapp artifacts
         uses: actions/download-artifact@v3
         with:
@@ -546,6 +551,10 @@ jobs:
         run: |
           python scripts/gha/read_ftl_test_result.py --test_result '${{ steps.ftl_test.outputs.test_summary }}' \
             --output_path testapps/test-results-"${{ steps.matrix_info.outputs.info }}".log
+      - name: Print available devices
+        if: ${{ matrix.device_type == 'virtual' && !cancelled() }}
+        run: |
+          xcrun xctrace list devices
       - name: Run Mobile integration tests on virtual device locally
         timeout-minutes: 120
         if: ${{ matrix.device_type == 'virtual' && !cancelled() }}

scripts/gha/test_simulator.py

@@ -396,7 +396,7 @@ def _create_and_boot_simulator(apple_platform, device_name, device_os):
   command = "xcrun xctrace list devices 2>&1 | grep \"%s Simulator (%s)\" | awk -F'[()]' '{print $4}'" % (device_name, device_os)
   logging.info("Get test simulator: %s", command)
   result = subprocess.Popen(command, universal_newlines=True, shell=True, stdout=subprocess.PIPE)
-  device_id = result.stdout.read().strip()
+  device_id = result.stdout.readline().strip()
 
   if not device_id:
     # download and create device