diff --git a/core-buffer/test/test_ReplayH5Reader.cpp b/core-buffer/test/test_ReplayH5Reader.cpp
index 3002bf7..f554cb6 100644
--- a/core-buffer/test/test_ReplayH5Reader.cpp
+++ b/core-buffer/test/test_ReplayH5Reader.cpp
@@ -20,6 +20,55 @@ TEST(ReplayH5Reader, basic_interaction)
     auto w_frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
     auto r_frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
 
+    // Setup test values.
+    w_metadata.pulse_id = pulse_id;
+    w_metadata.frame_index = 2;
+    w_metadata.daq_rec = 3;
+    w_metadata.n_received_packets = 128;
+    w_metadata.module_id = 4;
+
+    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
+        w_frame_buffer[i] = i % 100;
+    }
+
+    // Write to file.
+    writer.set_pulse_id(pulse_id);
+    writer.write(&w_metadata, (char*)&(w_frame_buffer[0]));
+    writer.close_file();
+
+    auto frame_present = reader.get_frame(
+            pulse_id, &r_metadata, (char*)&(r_frame_buffer[0]));
+
+    ASSERT_EQ(frame_present, true);
+
+    // Metadata has to match.
+    EXPECT_EQ(r_metadata.pulse_id, w_metadata.pulse_id);
+    EXPECT_EQ(r_metadata.frame_index, w_metadata.frame_index);
+    EXPECT_EQ(r_metadata.daq_rec, w_metadata.daq_rec);
+    EXPECT_EQ(r_metadata.n_received_packets, w_metadata.n_received_packets);
+    EXPECT_EQ(r_metadata.module_id, w_metadata.module_id);
+
+    // Data as well.
+    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
+        w_frame_buffer[i] = r_frame_buffer[i];
+    }
+}
+
+TEST(ReplayH5Reader, missing_frame)
+{
+    auto root_folder = ".";
+    auto device_name = "fast_device";
+
+    // This 2 must be compatible by design.
+    BufferH5Writer writer(root_folder, device_name);
+    ReplayH5Reader reader(root_folder, device_name);
+
+    size_t pulse_id = 65;
+
+    ModuleFrame w_metadata;
+    ModuleFrame r_metadata;
+    auto w_frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
+    auto r_frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
 
     // Setup test values.
     w_metadata.pulse_id = pulse_id;
@@ -37,17 +86,21 @@ TEST(ReplayH5Reader, basic_interaction)
     writer.write(&w_metadata, (char*)&(w_frame_buffer[0]));
     writer.close_file();
 
-    reader.get_frame(pulse_id, &r_metadata, (char*)&(r_frame_buffer[0]));
+    // But read another pulse_id, that should be empty.
+    auto frame_present = reader.get_frame(
+            pulse_id-1, &r_metadata, (char*)&(r_frame_buffer[0]));
 
-    // Metadata has to match.
-    EXPECT_EQ(r_metadata.pulse_id, w_metadata.pulse_id);
-    EXPECT_EQ(r_metadata.frame_index, w_metadata.frame_index);
-    EXPECT_EQ(r_metadata.daq_rec, w_metadata.daq_rec);
-    EXPECT_EQ(r_metadata.n_received_packets, w_metadata.n_received_packets);
-    EXPECT_EQ(r_metadata.module_id, w_metadata.module_id);
+    ASSERT_EQ(frame_present, false);
+
+    // All metadata has to be 0.
+    EXPECT_EQ(r_metadata.pulse_id, 0);
+    EXPECT_EQ(r_metadata.frame_index, 0);
+    EXPECT_EQ(r_metadata.daq_rec, 0);
+    EXPECT_EQ(r_metadata.n_received_packets, 0);
+    EXPECT_EQ(r_metadata.module_id, 0);
 
     // Data as well.
     for (size_t i=0; i<MODULE_N_PIXELS; i++) {
-        w_frame_buffer[i] = r_frame_buffer[i];
+        r_frame_buffer[i] = 0;
     }
 }