feat: added tests to check consumer resilience against corrupted data. All tests pased

tests/test_consumer.cxx

@@ -1,7 +1,11 @@
 #include <gtest/gtest.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
 
 #include <QCoreApplication>
 #include <QSignalSpy>
+#include <cstring>
 
 #include "Consumer.hpp"
 #include "UnixIpcBridge.hpp"
@@ -118,3 +122,94 @@ TEST(ConsumerThreadTest, StopsCleanlyWhenNeverStarted)
   // stop() on a consumer that was never started must not crash
   consumer.stop();
 }
+
+// ---------------------------------------------------------------------------
+// Requirement 2: Consumer receiving corrupted data (non-numeric)
+// ---------------------------------------------------------------------------
+
+/// Helper: raw-connect to a UNIX socket and send arbitrary bytes.
+static void send_raw_bytes(const std::string& path, const void* data,
+                           size_t len)
+{
+  int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+  ASSERT_GE(fd, 0);
+
+  struct sockaddr_un addr = {};
+  addr.sun_family = AF_UNIX;
+  std::strncpy(addr.sun_path, path.c_str(), sizeof(addr.sun_path) - 1);
+
+  ASSERT_EQ(
+      connect(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)), 0);
+
+  if (len > 0)
+  {
+    ::send(fd, data, len, 0);
+  }
+  close(fd);
+}
+
+TEST(ConsumerThreadTest, DropsCorruptedShortMessage)
+{
+  const std::string sock = "/tmp/test_ct_corrupt_short.sock";
+
+  ConsumerThread consumer(sock);
+  QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+  consumer.start();
+
+  // Send only 2 bytes instead of sizeof(int)==4 — corrupted / partial message
+  uint16_t garbage = 0xBEEF;
+  send_raw_bytes(sock, &garbage, sizeof(garbage));
+
+  // Give the consumer time to process (or not)
+  spy.wait(500);
+  consumer.stop();
+
+  // No signal should have been emitted
+  EXPECT_EQ(spy.count(), 0);
+}
+
+TEST(ConsumerThreadTest, DropsEmptyConnection)
+{
+  const std::string sock = "/tmp/test_ct_corrupt_empty.sock";
+
+  ConsumerThread consumer(sock);
+  QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+  consumer.start();
+
+  // Connect and immediately close — zero bytes sent
+  send_raw_bytes(sock, nullptr, 0);
+
+  spy.wait(500);
+  consumer.stop();
+
+  EXPECT_EQ(spy.count(), 0);
+}
+
+TEST(ConsumerThreadTest, SurvivesCorruptedThenReceivesValid)
+{
+  const std::string sock = "/tmp/test_ct_corrupt_then_valid.sock";
+
+  ConsumerThread consumer(sock);
+  QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+  consumer.start();
+
+  // First: send corrupted (1 byte)
+  uint8_t one_byte = 0xFF;
+  send_raw_bytes(sock, &one_byte, sizeof(one_byte));
+  std::this_thread::sleep_for(std::chrono::milliseconds(50));
+
+  // Then: send a valid int via the normal bridge
+  UnixIpcBridge bridge(sock);
+  bridge.send(777);
+
+  // Wait for the valid signal
+  for (int attempt = 0; spy.count() < 1 && attempt < 20; ++attempt)
+  {
+    spy.wait(100);
+  }
+  consumer.stop();
+
+  // The corrupted message must have been dropped, valid one received
+  ASSERT_EQ(spy.count(), 1);
+  EXPECT_EQ(spy.at(0).at(0).toInt(), 777);
+}