[test] Move cctest/test-diy-fp to unittests/numbers/

... diy-fp-unittest.

Bug: v8:12781
Change-Id: I7cb996c095ec0c946ed2db311dfd815e1cbd459b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3676643Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80831}

test/cctest/BUILD.gn

@@ -191,7 +191,6 @@ v8_source_set("cctest_sources") {
     "test-dictionary.cc",
     "test-disasm-regex-helper.cc",
     "test-disasm-regex-helper.h",
-    "test-diy-fp.cc",
     "test-factory.cc",
     "test-feedback-vector.cc",
     "test-feedback-vector.h",

test/unittests/BUILD.gn

@@ -395,6 +395,7 @@ v8_source_set("unittests_sources") {
     "logging/log-unittest.cc",
     "numbers/bigint-unittest.cc",
     "numbers/conversions-unittest.cc",
+    "numbers/diy-fp-unittest.cc",
     "numbers/strtod-unittest.cc",
     "objects/array-list-unittest.cc",
     "objects/concurrent-descriptor-array-unittest.cc",

test/cctest/test-diy-fp.cc → test/unittests/numbers/diy-fp-unittest.cc

@@ -25,17 +25,21 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include "src/base/numbers/diy-fp.h"
+
 #include <stdlib.h>
 
-#include "src/base/numbers/diy-fp.h"
 #include "src/base/platform/platform.h"
 #include "src/init/v8.h"
-#include "test/cctest/cctest.h"
+#include "test/unittests/test-utils.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
 namespace base {
 
-TEST(Subtract) {
+using DiyFpTest = ::testing::Test;
+
+TEST_F(DiyFpTest, Subtract) {
   DiyFp diy_fp1 = DiyFp(3, 0);
   DiyFp diy_fp2 = DiyFp(1, 0);
   DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
@@ -47,8 +51,7 @@ TEST(Subtract) {
   CHECK_EQ(0, diy_fp1.e());
 }
 
-
-TEST(Multiply) {
+TEST_F(DiyFpTest, Multiply) {
   DiyFp diy_fp1 = DiyFp(3, 0);
   DiyFp diy_fp2 = DiyFp(2, 0);
   DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);