EnricoMi commented on code in PR #48709:
URL: https://github.com/apache/arrow/pull/48709#discussion_r2664591058


##########
cpp/src/arrow/array/array_test.cc:
##########
@@ -4237,4 +4237,69 @@ TEST_F(TestHalfFloatBuilder, TestBulkAppend) {
   }
 }
 
+class TestDayTimeIntervalBuilder : public ::testing::Test {
+ public:
+  void VerifyValue(const DayTimeIntervalBuilder& builder, int64_t index,
+                   DayTimeIntervalType::DayMilliseconds expected) {
+    ASSERT_EQ(builder.GetValue(index), expected);
+    ASSERT_EQ(builder[index], expected);
+  }
+};
+
+TEST_F(TestDayTimeIntervalBuilder, TestAppend) {
+  DayTimeIntervalBuilder builder;
+  DayTimeIntervalType::DayMilliseconds value1{1, 100};
+  DayTimeIntervalType::DayMilliseconds value2{3, 200};
+  DayTimeIntervalType::DayMilliseconds value3{5, 300};
+
+  ASSERT_OK(builder.Append(value1));
+  ASSERT_OK(builder.Append(value2));
+  ASSERT_OK(builder.AppendNull());
+  ASSERT_OK(builder.Reserve(3));
+  builder.UnsafeAppend(value3);
+
+  VerifyValue(builder, 0, value1);
+  VerifyValue(builder, 1, value2);
+  VerifyValue(builder, 3, value3);

Review Comment:
   Shall we assert value 2 of builder is null? Does `builder` provide access to 
null values?



##########
cpp/src/arrow/array/array_test.cc:
##########
@@ -4237,4 +4237,69 @@ TEST_F(TestHalfFloatBuilder, TestBulkAppend) {
   }
 }
 
+class TestDayTimeIntervalBuilder : public ::testing::Test {
+ public:
+  void VerifyValue(const DayTimeIntervalBuilder& builder, int64_t index,
+                   DayTimeIntervalType::DayMilliseconds expected) {
+    ASSERT_EQ(builder.GetValue(index), expected);
+    ASSERT_EQ(builder[index], expected);
+  }
+};
+
+TEST_F(TestDayTimeIntervalBuilder, TestAppend) {
+  DayTimeIntervalBuilder builder;
+  DayTimeIntervalType::DayMilliseconds value1{1, 100};
+  DayTimeIntervalType::DayMilliseconds value2{3, 200};
+  DayTimeIntervalType::DayMilliseconds value3{5, 300};
+
+  ASSERT_OK(builder.Append(value1));
+  ASSERT_OK(builder.Append(value2));
+  ASSERT_OK(builder.AppendNull());
+  ASSERT_OK(builder.Reserve(3));
+  builder.UnsafeAppend(value3);
+
+  VerifyValue(builder, 0, value1);
+  VerifyValue(builder, 1, value2);
+  VerifyValue(builder, 3, value3);
+
+  ASSERT_OK_AND_ASSIGN(auto array, builder.Finish());
+  ASSERT_TRUE(array->IsNull(2));
+}

Review Comment:
   Shouldn't we test the non-null values of `array`as well?



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