diff --git a/test/echo-server.c b/test/echo-server.c
index e5201b9f..2c6ca0d7 100644
--- a/test/echo-server.c
+++ b/test/echo-server.c
@@ -119,8 +119,9 @@ static void after_read(uv_stream_t* handle,
   }
 
   wr = (write_req_t*) malloc(sizeof *wr);
-
+  ASSERT(wr != NULL);
   wr->buf = uv_buf_init(buf->base, nread);
+
   if (uv_write(&wr->req, handle, &wr->buf, 1, after_write)) {
     FATAL("uv_write failed");
   }
diff --git a/test/test-getaddrinfo.c b/test/test-getaddrinfo.c
index bca2a6bd..32ca91ef 100644
--- a/test/test-getaddrinfo.c
+++ b/test/test-getaddrinfo.c
@@ -126,6 +126,7 @@ TEST_IMPL(getaddrinfo_concurrent) {
     callback_counts[i] = 0;
 
     data = (int*)malloc(sizeof(int));
+    ASSERT(data != NULL);
     *data = i;
     getaddrinfo_handles[i].data = data;
 
diff --git a/test/test-ping-pong.c b/test/test-ping-pong.c
index c579fdd6..81941ab8 100644
--- a/test/test-ping-pong.c
+++ b/test/test-ping-pong.c
@@ -155,8 +155,10 @@ static void tcp_pinger_v6_new(void) {
   struct sockaddr_in6 server_addr;
   pinger_t *pinger;
 
+
   ASSERT(0 ==uv_ip6_addr("::1", TEST_PORT, &server_addr));
   pinger = malloc(sizeof(*pinger));
+  ASSERT(pinger != NULL);
   pinger->state = 0;
   pinger->pongs = 0;
 
@@ -185,6 +187,7 @@ static void tcp_pinger_new(void) {
 
   ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &server_addr));
   pinger = malloc(sizeof(*pinger));
+  ASSERT(pinger != NULL);
   pinger->state = 0;
   pinger->pongs = 0;
 
@@ -211,6 +214,7 @@ static void pipe_pinger_new(void) {
   pinger_t *pinger;
 
   pinger = (pinger_t*)malloc(sizeof(*pinger));
+  ASSERT(pinger != NULL);
   pinger->state = 0;
   pinger->pongs = 0;
 
diff --git a/test/test-spawn.c b/test/test-spawn.c
index 7eded879..0f4389f1 100644
--- a/test/test-spawn.c
+++ b/test/test-spawn.c
@@ -837,6 +837,7 @@ TEST_IMPL(argument_escaping) {
   WCHAR* non_verbatim_output;
 
   test_output = calloc(count, sizeof(WCHAR*));
+  ASSERT(test_output != NULL);
   for (i = 0; i < count; ++i) {
     test_output[i] = calloc(2 * (wcslen(test_str[i]) + 2), sizeof(WCHAR));
     quote_cmd_arg(test_str[i], test_output[i]);
@@ -845,6 +846,7 @@ TEST_IMPL(argument_escaping) {
     total_size += wcslen(test_output[i]) + 1;
   }
   command_line = calloc(total_size + 1, sizeof(WCHAR));
+  ASSERT(command_line != NULL);
   for (i = 0; i < count; ++i) {
     wcscat(command_line, test_output[i]);
     wcscat(command_line, L" ");
diff --git a/test/test-threadpool-cancel.c b/test/test-threadpool-cancel.c
index 3f516437..a349876b 100644
--- a/test/test-threadpool-cancel.c
+++ b/test/test-threadpool-cancel.c
@@ -86,7 +86,9 @@ static void saturate_threadpool(void) {
      * the thread pool is saturated. As with any timing dependent test,
      * this is obviously not ideal.
      */
-    if (uv_cond_timedwait(&signal_cond, &signal_mutex, (uint64_t)(350 * 1e6))) {
+    if (uv_cond_timedwait(&signal_cond,
+                          &signal_mutex,
+                          (uint64_t) (350 * 1e6))) {
       ASSERT(0 == uv_cancel((uv_req_t*) req));
       break;
     }