diff --git a/src/objective-c/tests/CFStreamTests/CFStreamClientTests.mm b/src/objective-c/tests/CFStreamTests/CFStreamClientTests.mm
index 6c90f0898dc..140d8609314 100644
--- a/src/objective-c/tests/CFStreamTests/CFStreamClientTests.mm
+++ b/src/objective-c/tests/CFStreamTests/CFStreamClientTests.mm
@@ -48,8 +48,8 @@ static void finish_connection() {
 }
 
 static void must_succeed(void* arg, grpc_error_handle error) {
-  GPR_ASSERT(g_connecting != nullptr);
-  GPR_ASSERT(error.ok());
+  CHECK(g_connecting != nullptr);
+  CHECK(error.ok());
   grpc_endpoint_shutdown(g_connecting, GRPC_ERROR_CREATE("must_succeed called"));
   grpc_endpoint_destroy(g_connecting);
   g_connecting = nullptr;
@@ -57,8 +57,8 @@ static void must_succeed(void* arg, grpc_error_handle error) {
 }
 
 static void must_fail(void* arg, grpc_error_handle error) {
-  GPR_ASSERT(g_connecting == nullptr);
-  GPR_ASSERT(!error.ok());
+  CHECK(g_connecting == nullptr);
+  CHECK(!error.ok());
   NSLog(@"%s", grpc_core::StatusToString(error).c_str());
   finish_connection();
 }
@@ -88,21 +88,21 @@ static void must_fail(void* arg, grpc_error_handle error) {
   gpr_log(GPR_DEBUG, "test_succeeds");
 
   auto resolved_addr = grpc_core::StringToSockaddr("127.0.0.1:0");
-  GPR_ASSERT(resolved_addr.ok());
+  CHECK(resolved_addr.ok());
   struct sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*>(resolved_addr->addr);
 
   /* create a phony server */
   svr_fd = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(svr_fd >= 0);
-  GPR_ASSERT(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
-  GPR_ASSERT(0 == listen(svr_fd, 1));
+  CHECK(svr_fd >= 0);
+  CHECK(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
+  CHECK(0 == listen(svr_fd, 1));
 
   gpr_mu_lock(&g_mu);
   connections_complete_before = g_connections_complete;
   gpr_mu_unlock(&g_mu);
 
   /* connect to it */
-  GPR_ASSERT(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
+  CHECK(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
   GRPC_CLOSURE_INIT(&done, must_succeed, nullptr, grpc_schedule_on_exec_ctx);
   auto args =
       grpc_core::CoreConfiguration::Get().channel_args_preconditioning().PreconditionChannelArgs(
@@ -117,7 +117,7 @@ static void must_fail(void* arg, grpc_error_handle error) {
     r = accept(svr_fd, reinterpret_cast<struct sockaddr*>(addr),
                reinterpret_cast<socklen_t*>(&resolved_addr->len));
   } while (r == -1 && errno == EINTR);
-  GPR_ASSERT(r >= 0);
+  CHECK(r >= 0);
   close(r);
 
   grpc_core::ExecCtx::Get()->Flush();
@@ -145,14 +145,14 @@ static void must_fail(void* arg, grpc_error_handle error) {
   gpr_log(GPR_DEBUG, "test_fails");
 
   auto resolved_addr = grpc_core::StringToSockaddr("127.0.0.1:0");
-  GPR_ASSERT(resolved_addr.ok());
+  CHECK(resolved_addr.ok());
   struct sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*>(resolved_addr->addr);
 
   svr_fd = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(svr_fd >= 0);
-  GPR_ASSERT(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
-  GPR_ASSERT(0 == listen(svr_fd, 1));
-  GPR_ASSERT(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
+  CHECK(svr_fd >= 0);
+  CHECK(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
+  CHECK(0 == listen(svr_fd, 1));
+  CHECK(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
   close(svr_fd);
 
   gpr_mu_lock(&g_mu);
diff --git a/src/objective-c/tests/CronetTests/CronetUnitTests.mm b/src/objective-c/tests/CronetTests/CronetUnitTests.mm
index c021e383eea..e09a06e821a 100644
--- a/src/objective-c/tests/CronetTests/CronetUnitTests.mm
+++ b/src/objective-c/tests/CronetTests/CronetUnitTests.mm
@@ -154,7 +154,7 @@ unsigned int parse_h2_length(const char *field) {
 
   c = grpc_channel_create_call(client, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
                                grpc_slice_from_static_string("/foo"), NULL, deadline, NULL);
-  GPR_ASSERT(c);
+  CHECK(c);
 
   grpc_metadata_array_init(&initial_metadata_recv);
   grpc_metadata_array_init(&trailing_metadata_recv);
@@ -162,7 +162,7 @@ unsigned int parse_h2_length(const char *field) {
   grpc_call_details_init(&call_details);
 
   int sl = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(sl >= 0);
+  CHECK(sl >= 0);
 
   // Make an TCP endpoint to accept the connection
   struct sockaddr_in s_addr;
@@ -170,8 +170,8 @@ unsigned int parse_h2_length(const char *field) {
   s_addr.sin_family = AF_INET;
   s_addr.sin_addr.s_addr = htonl(INADDR_ANY);
   s_addr.sin_port = htons(port);
-  GPR_ASSERT(0 == bind(sl, (struct sockaddr *)&s_addr, sizeof(s_addr)));
-  GPR_ASSERT(0 == listen(sl, 5));
+  CHECK(0 == bind(sl, (struct sockaddr *)&s_addr, sizeof(s_addr)));
+  CHECK(0 == listen(sl, 5));
 
   memset(ops, 0, sizeof(ops));
   op = ops;
@@ -208,11 +208,11 @@ unsigned int parse_h2_length(const char *field) {
   op->reserved = NULL;
   op++;
   error = grpc_call_start_batch(c, ops, (size_t)(op - ops), (void *)1, NULL);
-  GPR_ASSERT(GRPC_CALL_OK == error);
+  CHECK(GRPC_CALL_OK == error);
 
   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
     int s = accept(sl, NULL, NULL);
-    GPR_ASSERT(s >= 0);
+    CHECK(s >= 0);
 
     // Close the connection after 1 second to trigger Cronet's on_failed()
     sleep(1);
@@ -223,7 +223,7 @@ unsigned int parse_h2_length(const char *field) {
   cqv.Expect((void *)1, true);
   cqv.Verify();
 
-  GPR_ASSERT(status == GRPC_STATUS_UNAVAILABLE);
+  CHECK(status == GRPC_STATUS_UNAVAILABLE);
 
   grpc_slice_unref(details);
   grpc_metadata_array_destroy(&initial_metadata_recv);
@@ -282,7 +282,7 @@ unsigned int parse_h2_length(const char *field) {
 
   c = grpc_channel_create_call(client, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
                                grpc_slice_from_static_string("/foo"), NULL, deadline, NULL);
-  GPR_ASSERT(c);
+  CHECK(c);
 
   grpc_metadata_array_init(&initial_metadata_recv);
   grpc_metadata_array_init(&trailing_metadata_recv);
@@ -292,18 +292,18 @@ unsigned int parse_h2_length(const char *field) {
   __weak XCTestExpectation *expectation = [self expectationWithDescription:@"Coalescing"];
 
   int sl = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(sl >= 0);
+  CHECK(sl >= 0);
   struct sockaddr_in s_addr;
   memset(&s_addr, 0, sizeof(s_addr));
   s_addr.sin_family = AF_INET;
   s_addr.sin_addr.s_addr = htonl(INADDR_ANY);
   s_addr.sin_port = htons(port);
-  GPR_ASSERT(0 == bind(sl, (struct sockaddr *)&s_addr, sizeof(s_addr)));
-  GPR_ASSERT(0 == listen(sl, 5));
+  CHECK(0 == bind(sl, (struct sockaddr *)&s_addr, sizeof(s_addr)));
+  CHECK(0 == listen(sl, 5));
 
   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
     int s = accept(sl, NULL, NULL);
-    GPR_ASSERT(s >= 0);
+    CHECK(s >= 0);
     struct timeval tv;
     tv.tv_sec = 2;
     tv.tv_usec = 0;
@@ -391,7 +391,7 @@ unsigned int parse_h2_length(const char *field) {
   op->reserved = NULL;
   op++;
   error = grpc_call_start_batch(c, ops, (size_t)(op - ops), (void *)1, NULL);
-  GPR_ASSERT(GRPC_CALL_OK == error);
+  CHECK(GRPC_CALL_OK == error);
 
   cqv.Expect((void *)1, true);
   cqv.Verify();
diff --git a/test/core/iomgr/ios/CFStreamTests/CFStreamClientTests.mm b/test/core/iomgr/ios/CFStreamTests/CFStreamClientTests.mm
index 8e7dd378836..77adb057d24 100644
--- a/test/core/iomgr/ios/CFStreamTests/CFStreamClientTests.mm
+++ b/test/core/iomgr/ios/CFStreamTests/CFStreamClientTests.mm
@@ -47,8 +47,8 @@ static void finish_connection() {
 }
 
 static void must_succeed(void* arg, grpc_error_handle error) {
-  GPR_ASSERT(g_connecting != nullptr);
-  GPR_ASSERT(error.ok());
+  CHECK(g_connecting != nullptr);
+  CHECK(error.ok());
   grpc_endpoint_shutdown(g_connecting, GRPC_ERROR_CREATE("must_succeed called"));
   grpc_endpoint_destroy(g_connecting);
   g_connecting = nullptr;
@@ -56,8 +56,8 @@ static void must_succeed(void* arg, grpc_error_handle error) {
 }
 
 static void must_fail(void* arg, grpc_error_handle error) {
-  GPR_ASSERT(g_connecting == nullptr);
-  GPR_ASSERT(!error.ok());
+  CHECK(g_connecting == nullptr);
+  CHECK(!error.ok());
   NSLog(@"%s", grpc_core::StatusToString(error).c_str());
   finish_connection();
 }
@@ -87,21 +87,21 @@ static void must_fail(void* arg, grpc_error_handle error) {
   gpr_log(GPR_DEBUG, "test_succeeds");
 
   auto resolved_addr = grpc_core::StringToSockaddr("127.0.0.1:0");
-  GPR_ASSERT(resolved_addr.ok());
+  CHECK(resolved_addr.ok());
   struct sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*>(resolved_addr->addr);
 
   /* create a phony server */
   svr_fd = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(svr_fd >= 0);
-  GPR_ASSERT(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
-  GPR_ASSERT(0 == listen(svr_fd, 1));
+  CHECK(svr_fd >= 0);
+  CHECK(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
+  CHECK(0 == listen(svr_fd, 1));
 
   gpr_mu_lock(&g_mu);
   connections_complete_before = g_connections_complete;
   gpr_mu_unlock(&g_mu);
 
   /* connect to it */
-  GPR_ASSERT(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
+  CHECK(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
   GRPC_CLOSURE_INIT(&done, must_succeed, nullptr, grpc_schedule_on_exec_ctx);
   auto args =
       grpc_core::CoreConfiguration::Get().channel_args_preconditioning().PreconditionChannelArgs(
@@ -116,7 +116,7 @@ static void must_fail(void* arg, grpc_error_handle error) {
     r = accept(svr_fd, reinterpret_cast<struct sockaddr*>(addr),
                reinterpret_cast<socklen_t*>(&resolved_addr->len));
   } while (r == -1 && errno == EINTR);
-  GPR_ASSERT(r >= 0);
+  CHECK(r >= 0);
   close(r);
 
   grpc_core::ExecCtx::Get()->Flush();
@@ -144,14 +144,14 @@ static void must_fail(void* arg, grpc_error_handle error) {
   gpr_log(GPR_DEBUG, "test_fails");
 
   auto resolved_addr = grpc_core::StringToSockaddr("127.0.0.1:0");
-  GPR_ASSERT(resolved_addr.ok());
+  CHECK(resolved_addr.ok());
   struct sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*>(resolved_addr->addr);
 
   svr_fd = socket(AF_INET, SOCK_STREAM, 0);
-  GPR_ASSERT(svr_fd >= 0);
-  GPR_ASSERT(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
-  GPR_ASSERT(0 == listen(svr_fd, 1));
-  GPR_ASSERT(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
+  CHECK(svr_fd >= 0);
+  CHECK(0 == bind(svr_fd, (struct sockaddr*)addr, (socklen_t)resolved_addr->len));
+  CHECK(0 == listen(svr_fd, 1));
+  CHECK(getsockname(svr_fd, (struct sockaddr*)addr, (socklen_t*)&resolved_addr->len) == 0);
   close(svr_fd);
 
   gpr_mu_lock(&g_mu);