diff --git a/test/unit/object_trace.cpp b/test/unit/object_trace.cpp
index e96db11..d3449ef 100644
--- a/test/unit/object_trace.cpp
+++ b/test/unit/object_trace.cpp
@@ -39,6 +39,7 @@ TEST(ObjectTrace, Basic) {
 CPPTRACE_FORCE_NO_INLINE void object_basic_resolution() {
     auto line = __LINE__ + 1;
     auto trace = cpptrace::generate_object_trace().resolve();
+    ASSERT_GE(trace.frames.size(), 1);
     EXPECT_THAT(trace.frames[0].filename, testing::EndsWith("object_trace.cpp"));
     EXPECT_EQ(trace.frames[0].line.value(), line);
     EXPECT_THAT(trace.frames[0].symbol, testing::HasSubstr("object_basic_resolution"));
@@ -69,6 +70,10 @@ CPPTRACE_FORCE_NO_INLINE int object_resolve_3(std::vector<int>& line_numbers) {
         cpptrace::object_frame{0, dummy.frames[3].object_address, dummy_otrace.frames[3].object_path}
     );
     auto trace = otrace.resolve();
+    if(trace.frames.size() < 4) {
+        ADD_FAILURE() << "trace.frames.size() >= 4";
+        return 2;
+    }
     int i = 0;
     EXPECT_THAT(trace.frames[i].filename, testing::EndsWith("object_trace.cpp"));
     EXPECT_EQ(trace.frames[i].line.value(), line_numbers[i]);
diff --git a/test/unit/raw_trace.cpp b/test/unit/raw_trace.cpp
index 2ddc72c..b6117ed 100644
--- a/test/unit/raw_trace.cpp
+++ b/test/unit/raw_trace.cpp
@@ -20,6 +20,7 @@ using namespace std::literals;
 CPPTRACE_FORCE_NO_INLINE static void raw_trace_basic() {
     auto raw_trace = cpptrace::generate_raw_trace();
     // look for within 90 bytes of the start of the function
+    ASSERT_GE(raw_trace.frames.size(), 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_basic));
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_basic) + 90);
 }
@@ -37,6 +38,7 @@ CPPTRACE_FORCE_NO_INLINE void raw_trace_basic_precise() {
     if(x) {
         goto* &&b;
     }
+    ASSERT_GE(raw_trace.frames.size(), 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&a));
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&b));
 }
@@ -57,6 +59,7 @@ CPPTRACE_FORCE_NO_INLINE static void raw_trace_multi_2(
     cpptrace::frame_ptr parent_high_bound
 ) {
     auto raw_trace = cpptrace::generate_raw_trace();
+    ASSERT_GE(raw_trace.frames.size(), 2);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_multi_2));
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_multi_2) + 90);
     EXPECT_GE(raw_trace.frames[1], parent_low_bound);
@@ -66,6 +69,7 @@ CPPTRACE_FORCE_NO_INLINE static void raw_trace_multi_2(
 CPPTRACE_FORCE_NO_INLINE static void raw_trace_multi_1() {
     auto raw_trace = cpptrace::generate_raw_trace();
     raw_trace_multi_2(reinterpret_cast<uintptr_t>(raw_trace_multi_1), reinterpret_cast<uintptr_t>(raw_trace_multi_1) + 300);
+    ASSERT_GE(raw_trace.frames.size(), 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_multi_1));
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(raw_trace_multi_1) + 90);
 }
@@ -88,6 +92,7 @@ CPPTRACE_FORCE_NO_INLINE void raw_trace_multi_precise_3() {
     if(x) {
         goto* &&b;
     }
+    ASSERT_GE(raw_trace.frames.size(), parents.size() + 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&a)); // this frame
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&b));
     for(size_t i = 0; i < parents.size(); i++) { // parent frames
@@ -107,6 +112,7 @@ CPPTRACE_FORCE_NO_INLINE void raw_trace_multi_precise_2() {
     if(x) {
         goto* &&b;
     }
+    ASSERT_GE(raw_trace.frames.size(), parents.size() + 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&a)); // this frame
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&b));
     for(size_t i = 0; i < parents.size(); i++) { // parent frames
@@ -136,6 +142,7 @@ CPPTRACE_FORCE_NO_INLINE void raw_trace_multi_precise_1() {
     if(x) {
         goto* &&b;
     }
+    ASSERT_GE(raw_trace.frames.size(), 1);
     EXPECT_GE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&a));
     EXPECT_LE(raw_trace.frames[0], reinterpret_cast<uintptr_t>(&&b));
     record_parent(reinterpret_cast<uintptr_t>(&&c), reinterpret_cast<uintptr_t>(&&d));
diff --git a/test/unit/stacktrace.cpp b/test/unit/stacktrace.cpp
index 87cd389..e252de2 100644
--- a/test/unit/stacktrace.cpp
+++ b/test/unit/stacktrace.cpp
@@ -31,6 +31,7 @@ TEST(Stacktrace, Empty) {
 CPPTRACE_FORCE_NO_INLINE void stacktrace_basic() {
     auto line = __LINE__ + 1;
     auto trace = cpptrace::generate_trace();
+    ASSERT_GE(trace.frames.size(), 1);
     EXPECT_THAT(trace.frames[0].filename, testing::EndsWith("stacktrace.cpp"));
     EXPECT_EQ(trace.frames[0].line.value(), line);
     EXPECT_THAT(trace.frames[0].symbol, testing::HasSubstr("stacktrace_basic"));
@@ -47,6 +48,10 @@ TEST(Stacktrace, Basic) {
 CPPTRACE_FORCE_NO_INLINE int stacktrace_multi_3(std::vector<int>& line_numbers) {
     line_numbers.insert(line_numbers.begin(), __LINE__ + 1);
     auto trace = cpptrace::generate_trace();
+    if(trace.frames.size() < 4) {
+        ADD_FAILURE() << "trace.frames.size() >= 4";
+        return 2;
+    }
     int i = 0;
     EXPECT_THAT(trace.frames[i].filename, testing::EndsWith("stacktrace.cpp"));
     EXPECT_EQ(trace.frames[i].line.value(), line_numbers[i]);
@@ -104,6 +109,7 @@ TEST(Stacktrace, RawTraceResolution) {
     line_numbers.insert(line_numbers.begin(), __LINE__ + 1);
     auto raw = stacktrace_raw_resolve_1(line_numbers);
     auto trace = raw.resolve();
+    ASSERT_GE(trace.frames.size(), 4);
     int i = 0;
     EXPECT_THAT(trace.frames[i].filename, testing::EndsWith("stacktrace.cpp"));
     EXPECT_EQ(trace.frames[i].line.value(), line_numbers[i]);
@@ -128,6 +134,10 @@ TEST(Stacktrace, RawTraceResolution) {
 CPPTRACE_FORCE_NO_INLINE int stacktrace_inline_resolution_3(std::vector<int>& line_numbers) {
     line_numbers.insert(line_numbers.begin(), __LINE__ + 1);
     auto trace = cpptrace::generate_trace();
+    if(trace.frames.size() < 4) {
+        ADD_FAILURE() << "trace.frames.size() >= 4";
+        return 2;
+    }
     int i = 0;
     EXPECT_THAT(trace.frames[i].filename, testing::EndsWith("stacktrace.cpp"));
     EXPECT_EQ(trace.frames[i].line.value(), line_numbers[i]);