Extend testAvailableArgTypes (#20374)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20374

This test case now also tests that the argument type works correctly in kernels that
- don't return outputs
- return multiple outputs

Reviewed By: li-roy

Differential Revision: D15298233

fbshipit-source-id: 82ab9d81b55b4f9fb34d66a155cc426af8592e25
diff --git a/aten/src/ATen/core/op_registration/op_registration_test.cpp b/aten/src/ATen/core/op_registration/op_registration_test.cpp
index 04bc044..b44838a 100644
--- a/aten/src/ATen/core/op_registration/op_registration_test.cpp
+++ b/aten/src/ATen/core/op_registration/op_registration_test.cpp
@@ -9,6 +9,7 @@
 
 #include <ATen/core/op_registration/op_registration.h>
 #include <ATen/core/Tensor.h>
+#include <functional>
 
 using c10::RegisterOperators;
 using c10::OperatorKernel;
@@ -414,151 +415,178 @@
     return output_;
   }
 
-  static void test(InputType input, std::function<void(const InputType&)> inputExpectation, OutputType output, std::function<void(const IValue&)> outputExpectation, const std::string& schema) {
-    // test with explicitly specified schema
-    test_(input, inputExpectation, output, outputExpectation, schema);
-
-    // test with inferred schema
-    test_(input, inputExpectation, output, outputExpectation, "");
-  }
-
-private:
-  static void test_(InputType input, std::function<void(const InputType&)> inputExpectation, OutputType output, std::function<void(const IValue&)> outputExpectation, const std::string& schema = "") {
+  static void test(InputType input, std::function<void(const InputType&)> inputExpectation, OutputType output, std::function<void(const c10::Stack&)> outputExpectation, const std::string& schema) {
     auto registry = c10::RegisterOperators().op("_test::my_op" + schema, kernel<ArgTypeTestKernel>(input, std::move(inputExpectation), std::move(output)));
     auto op = Dispatcher::singleton().findSchema("_test::my_op", "");
     ASSERT_TRUE(op.has_value()); // assert schema is registered
     auto actualOutput = callOp(*op, std::move(input));
-    EXPECT_EQ(1, actualOutput.size());
-    outputExpectation(actualOutput[0]);
+    outputExpectation(actualOutput);
   }
 
+private:
+
   InputType input_;
   std::function<void(const InputType&)> inputExpectation_;
   OutputType output_;
   std::string schema_;
 };
 
+template<class InputType, class OutputType = InputType>
+struct testArgTypes final {
+  static void test(InputType input, std::function<void(const InputType&)> inputExpectation, OutputType output, std::function<void(const IValue&)> outputExpectation, const std::string& schema) {
+    // Test with explicitly specified schema
+    ArgTypeTestKernel<InputType, OutputType>::test(
+      input, inputExpectation, output, [&] (const c10::Stack& output) {
+        EXPECT_EQ(1, output.size());
+        outputExpectation(output[0]);
+      }, schema
+    );
+
+    // Test with inferred schema
+    ArgTypeTestKernel<InputType, OutputType>::test(
+      input, inputExpectation, output, [&] (const c10::Stack& output) {
+        EXPECT_EQ(1, output.size());
+        outputExpectation(output[0]);
+      }, ""
+    );
+
+    // Test taking argument and returning nothing
+    ArgTypeTestKernel<InputType, std::tuple<>>::test(
+      input, inputExpectation, {}, [] (const c10::Stack&) {}, ""
+    );
+
+    // Test taking argument and returning multiple outputs
+    ArgTypeTestKernel<InputType, std::tuple<int64_t, OutputType>>::test(
+      input, inputExpectation, std::tuple<int64_t, OutputType>{3, output}, [&] (const c10::Stack& output) {
+        EXPECT_EQ(2, output.size());
+        EXPECT_EQ(3, output[0].toInt());
+        outputExpectation(output[1]);
+      }, ""
+    );
+  }
+};
+
 TEST(OperatorRegistrationTest, testAvailableArgTypes) {
   // TODO Test Scalar
 
   // primitive types
-  ArgTypeTestKernel<double>::test(
+  testArgTypes<double>::test(
     1.5, [] (const double& v) {EXPECT_EQ(1.5, v);},
     2.5, [] (const IValue& v) {EXPECT_EQ(2.5, v.toDouble());},
     "(float a) -> float");
-  ArgTypeTestKernel<int64_t>::test(
+  testArgTypes<int64_t>::test(
     1, [] (const int64_t& v) {EXPECT_EQ(1, v);},
     2, [] (const IValue& v) {EXPECT_EQ(2, v.toInt());},
     "(int a) -> int");
-  ArgTypeTestKernel<bool>::test(
+  testArgTypes<bool>::test(
     true, [] (const bool& v) {EXPECT_EQ(true, v);},
     false, [] (const IValue& v) {EXPECT_EQ(false, v.toBool());},
     "(bool a) -> bool");
-  ArgTypeTestKernel<bool>::test(
+  testArgTypes<bool>::test(
     false, [] (const bool& v) {EXPECT_EQ(false, v);},
     true, [] (const IValue& v) {EXPECT_EQ(true, v.toBool());},
     "(bool a) -> bool");
-  ArgTypeTestKernel<std::string>::test(
+  testArgTypes<std::string>::test(
     "string1", [] (const std::string& v) {EXPECT_EQ("string1", v);},
     "string2", [] (const IValue& v) {EXPECT_EQ("string2", v.toString()->string());},
     "(str a) -> str");
-  ArgTypeTestKernel<Tensor>::test(
+  testArgTypes<Tensor>::test(
     dummyTensor(TensorType1()), [] (const Tensor& v) {EXPECT_EQ(TensorType1(), v.type_id());},
     dummyTensor(TensorType2()), [] (const IValue& v) {EXPECT_EQ(TensorType2(), v.toTensor().type_id());},
     "(Tensor a) -> Tensor");
 
 
   // optional types (with has_value() == true)
-  ArgTypeTestKernel<c10::optional<double>>::test(
+  testArgTypes<c10::optional<double>>::test(
     c10::optional<double>(1.5), [] (const c10::optional<double>& v) {EXPECT_EQ(1.5, v.value());},
     c10::optional<double>(2.5), [] (const IValue& v) {EXPECT_EQ(2.5, v.toDouble());},
     "(float? a) -> float?");
-  ArgTypeTestKernel<c10::optional<int64_t>>::test(
+  testArgTypes<c10::optional<int64_t>>::test(
     c10::optional<int64_t>(1), [] (const c10::optional<int64_t>& v) {EXPECT_EQ(1, v.value());},
     c10::optional<int64_t>(2), [] (const IValue& v) {EXPECT_EQ(2, v.toInt());},
     "(int? a) -> int?");
-  ArgTypeTestKernel<c10::optional<bool>>::test(
+  testArgTypes<c10::optional<bool>>::test(
     c10::optional<bool>(true), [] (const c10::optional<bool>& v) {EXPECT_EQ(true, v.value());},
     c10::optional<bool>(false), [] (const IValue& v) {EXPECT_EQ(false, v.toBool());},
     "(bool? a) -> bool?");
-  ArgTypeTestKernel<c10::optional<bool>>::test(
+  testArgTypes<c10::optional<bool>>::test(
     c10::optional<bool>(false), [] (const c10::optional<bool>& v) {EXPECT_EQ(false, v.value());},
     c10::optional<bool>(true), [] (const IValue& v) {EXPECT_EQ(true, v.toBool());},
     "(bool? a) -> bool?");
-  ArgTypeTestKernel<c10::optional<std::string>>::test(
+  testArgTypes<c10::optional<std::string>>::test(
     c10::optional<std::string>("string1"), [] (const c10::optional<std::string>& v) {EXPECT_EQ("string1", v.value());},
     c10::optional<std::string>("string2"), [] (const IValue& v) {EXPECT_EQ("string2", v.toString()->string());},
     "(str? a) -> str?");
-  ArgTypeTestKernel<c10::optional<Tensor>>::test(
+  testArgTypes<c10::optional<Tensor>>::test(
     c10::optional<Tensor>(dummyTensor(TensorType1())), [] (const c10::optional<Tensor>& v) {EXPECT_EQ(TensorType1(), v.value().type_id());},
     c10::optional<Tensor>(dummyTensor(TensorType2())), [] (const IValue& v) {EXPECT_EQ(TensorType2(), v.toTensor().type_id());},
     "(Tensor? a) -> Tensor?");
 
 
   // optional types (with has_value() == false)
-  ArgTypeTestKernel<c10::optional<double>>::test(
+  testArgTypes<c10::optional<double>>::test(
     c10::optional<double>(), [] (const c10::optional<double>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<double>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(float? a) -> float?");
-  ArgTypeTestKernel<c10::optional<int64_t>>::test(
+  testArgTypes<c10::optional<int64_t>>::test(
     c10::optional<int64_t>(), [] (const c10::optional<int64_t>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<int64_t>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(int? a) -> int?");
-  ArgTypeTestKernel<c10::optional<bool>>::test(
+  testArgTypes<c10::optional<bool>>::test(
     c10::optional<bool>(), [] (const c10::optional<bool>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<bool>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(bool? a) -> bool?");
-  ArgTypeTestKernel<c10::optional<bool>>::test(
+  testArgTypes<c10::optional<bool>>::test(
     c10::optional<bool>(), [] (const c10::optional<bool>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<bool>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(bool? a) -> bool?");
-  ArgTypeTestKernel<c10::optional<std::string>>::test(
+  testArgTypes<c10::optional<std::string>>::test(
     c10::optional<std::string>(), [] (const c10::optional<std::string>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<std::string>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(str? a) -> str?");
-  ArgTypeTestKernel<c10::optional<Tensor>>::test(
+  testArgTypes<c10::optional<Tensor>>::test(
     c10::optional<Tensor>(), [] (const c10::optional<Tensor>& v) {EXPECT_FALSE(v.has_value());},
     c10::optional<Tensor>(), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(Tensor? a) -> Tensor?");
 
 
   // list types (with empty list)
-  ArgTypeTestKernel<c10::ArrayRef<double>, std::vector<double>>::test(
+  testArgTypes<c10::ArrayRef<double>, std::vector<double>>::test(
     c10::ArrayRef<double>(), [] (c10::ArrayRef<double> v) {EXPECT_EQ(0, v.size());},
     std::vector<double>(), [] (const IValue& v) {EXPECT_EQ(0, v.toDoubleListRef().size());},
     "(float[] a) -> float[]");
-  ArgTypeTestKernel<c10::ArrayRef<int64_t>, std::vector<int64_t>>::test(
+  testArgTypes<c10::ArrayRef<int64_t>, std::vector<int64_t>>::test(
     c10::ArrayRef<int64_t>(), [] (c10::ArrayRef<int64_t> v) {EXPECT_EQ(0, v.size());},
     std::vector<int64_t>(), [] (const IValue& v) {EXPECT_EQ(0, v.toIntListRef().size());},
     "(int[] a) -> int[]");
   // TODO Converting std::vector<bool> to ArrayRef<bool> doesn't work, so we
   //      need to find an alternative
-  // ArgTypeTestKernel<c10::ArrayRef<bool>, std::vector<bool>>::test(
+  // testArgTypes<c10::ArrayRef<bool>, std::vector<bool>>::test(
   //   c10::ArrayRef<bool>(), [] (c10::ArrayRef<bool> v) {EXPECT_EQ(0, v.size());},
   //   std::vector<bool>(), [] (const IValue& v) {EXPECT_EQ(0, v.toBoolListRef().size());},
   //   "(bool[] a) -> bool[]");
-  // ArgTypeTestKernel<c10::ArrayRef<bool>, std::vector<bool>>::test(
+  // testArgTypes<c10::ArrayRef<bool>, std::vector<bool>>::test(
   //   c10::ArrayRef<bool>(), [] (c10::ArrayRef<bool> v) {EXPECT_EQ(0, v.size());},
   //   std::vector<bool>(), [] (const IValue& v) {EXPECT_EQ(0, v.toBoolListRef().size());},
   //   "(bool[] a) -> bool[]");
   // TODO We currently don't support str[] (i.e. string list) as type. Do we want to?
-  // ArgTypeTestKernel<c10::ArrayRef<std::string>, std::vector<std::string>>::test(
+  // testArgTypes<c10::ArrayRef<std::string>, std::vector<std::string>>::test(
   //   c10::ArrayRef<std::string>(), [] (c10::ArrayRef<std::string> v) {EXPECT_EQ(0, v.size());},
   //   std::vector<std::string>(), [] (const IValue& v) {EXPECT_EQ(0, v.toStringListRef().size());},
   //   "(str[] a) -> str[]");
 
 
   // list types (with non-empty list)
-  ArgTypeTestKernel<c10::ArrayRef<double>, std::vector<double>>::test(
+  testArgTypes<c10::ArrayRef<double>, std::vector<double>>::test(
     c10::ArrayRef<double>({1.5, 2.5}), [] (c10::ArrayRef<double> v) {EXPECT_EQ(c10::ArrayRef<double>({1.5, 2.5}), v);},
     std::vector<double>({3.5, 4.5}), [] (const IValue& v) {EXPECT_EQ(std::vector<double>({3.5, 4.5}), v.toDoubleListRef());},
     "(float[] a) -> float[]");
-  ArgTypeTestKernel<c10::ArrayRef<int64_t>, std::vector<int64_t>>::test(
+  testArgTypes<c10::ArrayRef<int64_t>, std::vector<int64_t>>::test(
     c10::ArrayRef<int64_t>({1, 2}), [] (c10::ArrayRef<int64_t> v) {EXPECT_EQ(c10::ArrayRef<int64_t>({1, 2}), v);},
     std::vector<int64_t>({3, 4}), [] (const IValue& v) {EXPECT_EQ(std::vector<int64_t>({3, 4}), v.toIntListRef());},
     "(int[] a) -> int[]");
   // TODO When fixing bool[] and str[] (see above), also add them here
-  ArgTypeTestKernel<c10::ArrayRef<Tensor>, std::vector<Tensor>>::test(
+  testArgTypes<c10::ArrayRef<Tensor>, std::vector<Tensor>>::test(
     c10::ArrayRef<Tensor>({dummyTensor(TensorType1()), dummyTensor(TensorType2())}), [] (c10::ArrayRef<Tensor> v) {
       EXPECT_EQ(2, v.size());
       EXPECT_EQ(TensorType1(), v[0].type_id());
@@ -572,19 +600,19 @@
     "(Tensor[] a) -> Tensor[]");
 
   // Test optional of list (with nullopt)
-  ArgTypeTestKernel<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
+  testArgTypes<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
     c10::optional<c10::ArrayRef<int64_t>>(c10::nullopt), [] (c10::optional<c10::ArrayRef<int64_t>> v) {EXPECT_FALSE(v.has_value());},
     c10::optional<std::vector<int64_t>>(c10::nullopt), [] (const IValue& v) {EXPECT_TRUE(v.isNone());},
     "(int[]? a) -> int[]?");
 
   // Test optional of list (with empty list)
-  ArgTypeTestKernel<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
+  testArgTypes<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
     c10::optional<c10::ArrayRef<int64_t>>(c10::ArrayRef<int64_t>{}), [] (c10::optional<c10::ArrayRef<int64_t>> v) {EXPECT_EQ(0, v.value().size());},
     c10::optional<std::vector<int64_t>>(std::vector<int64_t>{}), [] (const IValue& v) {EXPECT_EQ(0, v.toIntListRef().size());},
     "(int[]? a) -> int[]?");
 
   // Test optional of list (with values)
-  ArgTypeTestKernel<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
+  testArgTypes<c10::optional<c10::ArrayRef<int64_t>>, c10::optional<std::vector<int64_t>>>::test(
     c10::optional<c10::ArrayRef<int64_t>>({1, 2}), [] (c10::optional<c10::ArrayRef<int64_t>> v) {EXPECT_EQ(c10::ArrayRef<int64_t>({1, 2}), v.value());},
     c10::optional<std::vector<int64_t>>({3, 4}), [] (const IValue& v) {EXPECT_EQ(std::vector<int64_t>({3, 4}), v.toIntListRef());},
     "(int[]? a) -> int[]?");
@@ -595,7 +623,7 @@
   c10::Dict<std::string, std::string> str_dict;
   str_dict.insert("key1", "value1");
   str_dict.insert("key2", "value2");
-  ArgTypeTestKernel<c10::Dict<std::string, std::string>>::test(
+  testArgTypes<c10::Dict<std::string, std::string>>::test(
     str_dict, [] (c10::Dict<std::string, std::string> v) {
       EXPECT_EQ(2, v.size());
       EXPECT_EQ("value1", v.at("key1"));
@@ -611,7 +639,7 @@
   c10::Dict<int64_t, Tensor> tensor_dict;
   tensor_dict.insert(1, dummyTensor(TensorType1()));
   tensor_dict.insert(2, dummyTensor(TensorType2()));
-  ArgTypeTestKernel<c10::Dict<int64_t, Tensor>>::test(
+  testArgTypes<c10::Dict<int64_t, Tensor>>::test(
     tensor_dict, [] (c10::Dict<int64_t, Tensor> v) {
       EXPECT_EQ(2, v.size());
       EXPECT_EQ(TensorType1(), v.at(1).type_id());