Add support for typed conformance tests.

WORKSPACE

@@ -101,8 +101,8 @@ go_repository(
 go_repository(
     name = "dev_cel_expr",
     importpath = "cel.dev/expr",
-    sum = "h1:CJ6drgk+Hf96lkLikr4rFf19WrU0BOWEihyZnI2TAzo=",
-    version = "v0.18.0",
+    sum = "h1:NciYrtDRIR0lNCnH1LFJegdjspNx9fI59O7TWcua/W4=",
+    version = "v0.19.1",
 )
 
 # local_repository(

common/types/types.go

@@ -768,6 +768,19 @@ func ProtoAsType(t *celpb.Type) (*Type, error) {
 	}
 }
 
+// TypeToProto converts from a CEL-native type representation to canonical CEL celpb.Type protobuf type.
+func TypeToProto(t *Type) (*celpb.Type, error) {
+	exprType, err := TypeToExprType(t)
+	if err != nil {
+		return nil, err
+	}
+	var pbtype celpb.Type
+	if err = convertProto(exprType, &pbtype); err != nil {
+		return nil, err
+	}
+	return &pbtype, nil
+}
+
 func maybeWrapper(t *Type, pbType *exprpb.Type) *exprpb.Type {
 	if t.IsAssignableType(NullType) {
 		return chkdecls.NewWrapperType(pbType)

conformance/BUILD.bazel

@@ -30,6 +30,7 @@ _ALL_TESTS = [
     "@dev_cel_expr//tests/simple:testdata/string.textproto",
     "@dev_cel_expr//tests/simple:testdata/string_ext.textproto",
     "@dev_cel_expr//tests/simple:testdata/timestamps.textproto",
+    "@dev_cel_expr//tests/simple:testdata/type_deduction.textproto",
     "@dev_cel_expr//tests/simple:testdata/unknowns.textproto",
     "@dev_cel_expr//tests/simple:testdata/wrappers.textproto",
     "@dev_cel_expr//tests/simple:testdata/block_ext.textproto",

conformance/conformance_test.go

@@ -168,6 +168,23 @@ func exprValueToRefValue(adapter types.Adapter, ev *valuepb.ExprValue) (ref.Val,
 	return nil, errors.New("unknown ExprValue kind")
 }
 
+func diffType(want *valuepb.Type, t *cel.Type) (string, error) {
+	got, err := types.TypeToProto(t)
+	if err != nil {
+		return "", err
+	}
+	return cmp.Diff(want, got, protocmp.Transform()), nil
+
+}
+
+func diffValue(want *valuepb.Value, got *valuepb.ExprValue) string {
+	return cmp.Diff(
+		&valuepb.ExprValue{Kind: &valuepb.ExprValue_Value{Value: want}},
+		got,
+		protocmp.Transform(),
+		protocmp.SortRepeatedFields(&valuepb.MapValue{}, "entries"))
+}
+
 func conformanceTest(t *testing.T, name string, pb *testpb.SimpleTest) {
 	if shouldSkipTest(name) {
 		t.SkipNow()
@@ -206,6 +223,16 @@ func conformanceTest(t *testing.T, name string, pb *testpb.SimpleTest) {
 			t.Fatal(err)
 		}
 	}
+	if pb.GetCheckOnly() {
+		m, ok := pb.GetResultMatcher().(*testpb.SimpleTest_TypedResult)
+		if !ok {
+			t.Fatalf("unexpected matcher kind for check only test: %T", pb.GetResultMatcher())
+		}
+		if diff, err := diffType(m.TypedResult.DeducedType, ast.OutputType()); err != nil || diff != "" {
+			t.Errorf("env.Check() output type err: %v (-want +got):\n%s", err, diff)
+		}
+		return
+	}
 	program, err := env.Program(ast)
 	if err != nil {
 		t.Fatal(err)
@@ -227,9 +254,23 @@ func conformanceTest(t *testing.T, name string, pb *testpb.SimpleTest) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if diff := cmp.Diff(&valuepb.ExprValue{Kind: &valuepb.ExprValue_Value{Value: m.Value}}, val, protocmp.Transform(), protocmp.SortRepeatedFields(&valuepb.MapValue{}, "entries")); diff != "" {
+		if diff := diffValue(m.Value, val); diff != "" {
 			t.Errorf("program.Eval() diff (-want +got):\n%s", diff)
 		}
+	case *testpb.SimpleTest_TypedResult:
+		if err != nil {
+			t.Fatalf("program.Eval(): got %v, want nil", err)
+		}
+		val, err := refValueToExprValue(ret)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if diff := diffValue(m.TypedResult.Result, val); diff != "" {
+			t.Errorf("program.Eval() diff (-want +got):\n%s", diff)
+		}
+		if diff, err := diffType(m.TypedResult.DeducedType, ast.OutputType()); err != nil || diff != "" {
+			t.Errorf("env.Check() output type err: %v (-want +got):\n%s", err, diff)
+		}
 	case *testpb.SimpleTest_EvalError:
 		if err == nil && types.IsError(ret) {
 			err = ret.(*types.Err).Unwrap()

conformance/go.mod

@@ -3,7 +3,7 @@ module github.com/google/cel-go/conformance
 go 1.21.1
 
 require (
-	cel.dev/expr v0.18.0
+	cel.dev/expr v0.19.1
 	github.com/bazelbuild/rules_go v0.49.0
 	github.com/google/cel-go v0.21.0
 	github.com/google/go-cmp v0.6.0

conformance/go.sum

@@ -1,5 +1,9 @@
 cel.dev/expr v0.18.0 h1:CJ6drgk+Hf96lkLikr4rFf19WrU0BOWEihyZnI2TAzo=
 cel.dev/expr v0.18.0/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
+cel.dev/expr v0.19.0 h1:lXuo+nDhpyJSpWxpPVi5cPUwzKb+dsdOiw6IreM5yt0=
+cel.dev/expr v0.19.0/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
+cel.dev/expr v0.19.1 h1:NciYrtDRIR0lNCnH1LFJegdjspNx9fI59O7TWcua/W4=
+cel.dev/expr v0.19.1/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
 github.com/antlr4-go/antlr/v4 v4.13.0 h1:lxCg3LAv+EUK6t1i0y1V6/SLeUi0eKEKdhQAlS8TVTI=
 github.com/antlr4-go/antlr/v4 v4.13.0/go.mod h1:pfChB/xh/Unjila75QW7+VU4TSnWnnk9UTnmpPaOR2g=
 github.com/bazelbuild/rules_go v0.49.0 h1:5vCbuvy8Q11g41lseGJDc5vxhDjJtfxr6nM/IC4VmqM=

go.mod

@@ -5,7 +5,7 @@ go 1.21.1
 toolchain go1.23.0
 
 require (
-	cel.dev/expr v0.18.0
+	cel.dev/expr v0.19.1
 	github.com/antlr4-go/antlr/v4 v4.13.0
 	github.com/stoewer/go-strcase v1.2.0
 	golang.org/x/text v0.16.0

go.sum

@@ -1,5 +1,9 @@
 cel.dev/expr v0.18.0 h1:CJ6drgk+Hf96lkLikr4rFf19WrU0BOWEihyZnI2TAzo=
 cel.dev/expr v0.18.0/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
+cel.dev/expr v0.19.0 h1:lXuo+nDhpyJSpWxpPVi5cPUwzKb+dsdOiw6IreM5yt0=
+cel.dev/expr v0.19.0/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
+cel.dev/expr v0.19.1 h1:NciYrtDRIR0lNCnH1LFJegdjspNx9fI59O7TWcua/W4=
+cel.dev/expr v0.19.1/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
 github.com/antlr4-go/antlr/v4 v4.13.0 h1:lxCg3LAv+EUK6t1i0y1V6/SLeUi0eKEKdhQAlS8TVTI=
 github.com/antlr4-go/antlr/v4 v4.13.0/go.mod h1:pfChB/xh/Unjila75QW7+VU4TSnWnnk9UTnmpPaOR2g=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=

vendor/modules.txt

@@ -1,4 +1,4 @@
-# cel.dev/expr v0.18.0
+# cel.dev/expr v0.19.1
 ## explicit; go 1.21.1
 cel.dev/expr
 # github.com/antlr4-go/antlr/v4 v4.13.0