CI - test all supported platforms and versions

.github/workflows/dart.yml

@@ -19,18 +19,36 @@ jobs:
         run: ./generator/test.sh
 
   lib:
-    runs-on: ubuntu-20.04
-    container:
-      image: google/dart:latest
+    strategy:
+      matrix:
+        os:
+          - windows-2019
+          - macos-10.15
+          - ubuntu-20.04
+        dart:
+          - 2.10.5
+          # - 2.9.3 - generator stuck. I remember there was an issue in some dependency but don't remember which one.
+          - 2.8.4
+          - 2.7.2
+    runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v1
+      # Note: dart-sdk from flutter doesn't work on linux, see https://github.com/flutter/flutter/issues/74599
+      #      - uses: subosito/flutter-action@v1
+      #        with:
+      #          flutter-version: 1.22.x
+      #      - run: flutter --version
+      - uses: cedx/setup-dart@v2
+        with:
+          version: ${{ matrix.dart }}
+      - run: dart --version
+      - uses: actions/checkout@v2
       - name: Install ObjectBox C-API
         run: ./install.sh
-      - run: pub get
+      - run: ./tool/pub.sh get
       - name: Generate ObjectBox models
-        run: pub run build_runner build
+        run: ./tool/pub.sh run build_runner build
       - name: Run tests
-        run: pub run test
+        run: ./tool/pub.sh run test
 
   valgrind:
     runs-on: ubuntu-20.04
@@ -47,4 +65,4 @@ jobs:
         run: |
           apt update
           apt install -y valgrind
-      - run: ./tool/valgrind.sh
+      - run: ./tool/valgrind.sh

lib/src/query/query.dart

@@ -754,7 +754,7 @@ class Query<T> {
     try {
       final idArray = idArrayPtr.ref;
       return idArray.count == 0
-          ? List<int>.empty()
+          ? List<int>.filled(0, 0)
           : idArray.ids.asTypedList(idArray.count).toList(growable: false);
     } finally {
       C.id_array_free(idArrayPtr);

pubspec.yaml

@@ -6,7 +6,8 @@ description: ObjectBox is a super-fast NoSQL ACID compliant object database.
 
 environment:
   #  sdk: '>=2.12.0-0 <3.0.0'
-  sdk: '>=2.6.0 <3.0.0'
+  # min 2.7.0 because of ffigen
+  sdk: '>=2.7.0 <3.0.0'
 
 dependencies:
   collection: ^1.14.11
@@ -20,8 +21,8 @@ dev_dependencies:
   build_runner: ^1.0.0
   objectbox_generator:
     path: generator
-  pedantic: ^1.10.0-nullsafety.0
-  test: ^1.16.0-nullsafety.0
+  pedantic: ^1.9.0
+  test: ^1.0.0
   ffigen: ^1.1.0
   flat_buffers: 1.12.0
 

tool/pub.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# forward all arguments to an available version of `pub`
+
+if [[ `command -v pub` ]]; then
+  pub "$@"
+elif [[ `command -v pub.bat` ]]; then
+  pub.bat "$@"
+else
+  dart pub "$@"
+fi