try using presets instead

Author: kealjones-wk

.github/workflows/dart_ci.yml

@@ -74,12 +74,12 @@ jobs:
 
       - name: Run tests (DDC)
         run: |
-          dart run build_runner test --delete-conflicting-outputs --exclude-tags=react-${{ matrix.react == 18 && '17' || '18' }} -- --preset dartdevc
+          dart run build_runner test --delete-conflicting-outputs -- --preset dartdevc --preset=react${{ matrix.react }}
         if: always() && steps.install.outcome == 'success'
         timeout-minutes: 8
 
       - name: Run tests (dart2js)
         run: |
-          dart run build_runner test --delete-conflicting-outputs --release --exclude-tags=react-${{ matrix.react == 18 && '17' || '18' }} -- --preset dart2js
+          dart run build_runner test --delete-conflicting-outputs --release -- --preset dart2js --preset=react${{ matrix.react }}
         if: always() && steps.install.outcome == 'success'
         timeout-minutes: 8

dart_test.yaml

@@ -14,6 +14,12 @@ presets:
   dartdevc:
     exclude_tags: no-dartdevc
 
+  react18:
+    exclude_tags: react-17
+
+  react17:
+    exclude_tags: react-18
+
 tags:
   # Variadic children tests of >5 children that fail in Dart 2.7 for an unknown reason, seemingly an SDK bug.
   # These tests pass in later Dart SDKs, so we ignore them when running in 2.7.