[test] Move cctest/test-concurrent-transition-array to

... unittests/objects/concurrent-transition-array-unittest.

Bug: v8:12781
Change-Id: Ic6fbef71e1439c0a0056b122a4b42dcad674ca3b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3604961Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#80174}

test/cctest/BUILD.gn

@@ -195,7 +195,6 @@ v8_source_set("cctest_sources") {
     "test-atomicops.cc",
     "test-bignum-dtoa.cc",
     "test-code-stub-assembler.cc",
-    "test-concurrent-transition-array.cc",
     "test-constantpool.cc",
     "test-cpu-profiler.cc",
     "test-debug-helper.cc",

test/unittests/BUILD.gn

@@ -379,6 +379,7 @@ v8_source_set("unittests_sources") {
     "objects/concurrent-prototype-unittest.cc",
     "objects/concurrent-script-context-table-unittest.cc",
     "objects/concurrent-string-unittest.cc",
+    "objects/concurrent-transition-array-unittest.cc",
     "objects/object-unittest.cc",
     "objects/swiss-hash-table-helpers-unittest.cc",
     "objects/value-serializer-unittest.cc",

test/unittests/test-utils.h

@@ -414,6 +414,26 @@ static inline uint16_t* AsciiToTwoByteString(const char* source) {
   return converted;
 }
 
+class TestTransitionsAccessor : public TransitionsAccessor {
+ public:
+  TestTransitionsAccessor(Isolate* isolate, Map map)
+      : TransitionsAccessor(isolate, map) {}
+  TestTransitionsAccessor(Isolate* isolate, Handle<Map> map)
+      : TransitionsAccessor(isolate, *map) {}
+
+  // Expose internals for tests.
+  bool IsUninitializedEncoding() { return encoding() == kUninitialized; }
+  bool IsWeakRefEncoding() { return encoding() == kWeakRef; }
+
+  bool IsFullTransitionArrayEncoding() {
+    return encoding() == kFullTransitionArray;
+  }
+
+  int Capacity() { return TransitionsAccessor::Capacity(); }
+
+  TransitionArray transitions() { return TransitionsAccessor::transitions(); }
+};
+
 }  // namespace internal
 }  // namespace v8