✅ Add test case for negative integer conversion

Author: taminob

mlir/unittests/Dialect/Utils/test_utils.cpp

@@ -59,7 +59,7 @@ TEST_F(UtilsTest, valueToDouble) {
   EXPECT_DOUBLE_EQ(stdValue.value(), expectedValue);
 }
 
-TEST_F(UtilsTest, valueToDoubleCastFromIntegerType) {
+TEST_F(UtilsTest, valueToDoubleCastFromInteger) {
   constexpr int expectedValue = 42;
   auto op = builder->create<arith::ConstantOp>(
       builder->getUnknownLoc(), builder->getI32IntegerAttr(expectedValue));
@@ -71,6 +71,19 @@ TEST_F(UtilsTest, valueToDoubleCastFromIntegerType) {
   EXPECT_DOUBLE_EQ(stdValue.value(), expectedValue);
 }
 
+TEST_F(UtilsTest, valueToDoubleCastFromNegativeInteger) {
+  constexpr int expectedValue = -123;
+  auto op = builder->create<arith::ConstantOp>(
+      builder->getUnknownLoc(), builder->getSI32IntegerAttr(expectedValue));
+  ASSERT_TRUE(op);
+
+  auto value = op.getResult();
+  auto stdValue = utils::valueToDouble(value);
+  ASSERT_TRUE(stdValue.has_value());
+  EXPECT_DOUBLE_EQ(stdValue.value(), expectedValue);
+}
+
+
 TEST_F(UtilsTest, valueToDoubleCastFromMaxUnsignedInteger) {
   constexpr auto expectedValue = std::numeric_limits<uint64_t>::max();
   constexpr auto bitCount = 64;