Test that CHECK respects ABSL_MIN_LOG_LEVEL

Ensure that the CHECK expression and message are stripped when FATAL is below
ABSL_MIN_LOG_LEVEL.

PiperOrigin-RevId: 548157637
Change-Id: I4308ff7ff75aabebdd2dcefa2771cd7e77112817

absl/log/stripping_test.cc

@@ -345,4 +345,30 @@ TEST_F(StrippingTest, Level) {
   }
 }
 
+TEST_F(StrippingTest, Check) {
+  // Here we also need a variable name with enough entropy that it's unlikely to
+  // appear in the binary by chance.  `volatile` keeps the tautological
+  // comparison (and the rest of the `CHECK`) from being optimized away.
+  const std::string var_needle = absl::Base64Escape("StrippingTestCheckVar");
+  const std::string msg_needle = absl::Base64Escape("StrippingTest.Check");
+  volatile int U3RyaXBwaW5nVGVzdENoZWNrVmFy = 0xCAFE;
+  // We don't care if the CHECK is actually executed, just that stripping works.
+  // Hiding it behind `kReallyDie` works around some overly aggressive
+  // optimizations in older versions of MSVC.
+  if (kReallyDie) {
+    CHECK(U3RyaXBwaW5nVGVzdENoZWNrVmFy != U3RyaXBwaW5nVGVzdENoZWNrVmFy)
+        << "U3RyaXBwaW5nVGVzdC5DaGVjaw==";
+  }
+
+  std::unique_ptr<FILE, std::function<void(FILE*)>> exe = OpenTestExecutable();
+  ASSERT_THAT(exe, NotNull());
+  if (absl::LogSeverity::kFatal >= kAbslMinLogLevel) {
+    EXPECT_THAT(exe.get(), FileHasSubstr(var_needle));
+    EXPECT_THAT(exe.get(), FileHasSubstr(msg_needle));
+  } else {
+    EXPECT_THAT(exe.get(), Not(FileHasSubstr(var_needle)));
+    EXPECT_THAT(exe.get(), Not(FileHasSubstr(msg_needle)));
+  }
+}
+
 }  // namespace