From 871e2bff992eda54f8192dd4425ebae3539c2e9a Mon Sep 17 00:00:00 2001
From: denchat <19730041+denchat@users.noreply.github.com>
Date: Tue, 7 May 2019 22:29:54 +0700
Subject: [PATCH] Move `test_count_digits` block from `format-test.cc`

---
 test/format-impl-test.cc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/test/format-impl-test.cc b/test/format-impl-test.cc
index 33263aaa..d6f85a37 100644
--- a/test/format-impl-test.cc
+++ b/test/format-impl-test.cc
@@ -237,3 +237,19 @@ TEST(FormatTest, FormatErrorCode) {
 TEST(FormatTest, CountCodePoints) {
   EXPECT_EQ(4, fmt::internal::count_code_points(fmt::u8string_view("ёжик")));
 }
+
+// Tests fmt::internal::count_digits for integer type Int.
+template <typename Int> void test_count_digits() {
+  for (Int i = 0; i < 10; ++i) EXPECT_EQ(1u, fmt::internal::count_digits(i));
+  for (Int i = 1, n = 1, end = std::numeric_limits<Int>::max() / 10; n <= end;
+       ++i) {
+    n *= 10;
+    EXPECT_EQ(i, fmt::internal::count_digits(n - 1));
+    EXPECT_EQ(i + 1, fmt::internal::count_digits(n));
+  }
+}
+
+TEST(UtilTest, CountDigits) {
+  test_count_digits<uint32_t>();
+  test_count_digits<uint64_t>();
+}