null_safety: add build_test requirements
diff --git a/build.yaml b/build.yaml
new file mode 100644
index 0000000..caaa99c
--- /dev/null
+++ b/build.yaml
@@ -0,0 +1,10 @@
+# See https://github.com/dart-lang/build/tree/master/build_web_compilers#configuration
+# Matches previous configuration in pubspec.yaml - transformers - $dart2js
+targets:
+  $default:
+    builders:
+      build_web_compilers|entrypoint:
+        # These are globs for the entrypoints you want to compile.
+        generate_for:
+          include:
+          - test/**.dart
diff --git a/pubspec.yaml b/pubspec.yaml
index 6a4b6b0..d2f5bcb 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,3 +12,7 @@
   path: ^1.0.0
   pedantic: ^1.0.0
   test: ^1.6.0
+
+  build_runner: ^1.0.0
+  build_test: ^0.10.0
+  build_web_compilers: '>=1.2.0 <3.0.0'