feat: implemented consumer thread, all tests pass

tests/test_consumer.cxx

@@ -0,0 +1,120 @@
+#include <gtest/gtest.h>
+
+#include <QCoreApplication>
+#include <QSignalSpy>
+
+#include "Consumer.hpp"
+#include "UnixIpcBridge.hpp"
+
+// QSignalSpy needs a QCoreApplication to dispatch queued signals
+static int argc_ = 0;
+static QCoreApplication app_(argc_, nullptr);
+
+TEST(ConsumerThreadTest, ReceivesSingleValue)
+{
+  const std::string sock = "/tmp/test_ct_single.sock";
+
+  ConsumerThread consumer(sock);
+
+  // QSignalSpy records every emission of the given signal
+  QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+  consumer.start();
+
+  UnixIpcBridge bridge(sock);
+  bridge.send(42);
+
+  // spy.wait() pumps the event loop for up to 1s until a signal arrives
+  spy.wait(1000);
+  consumer.stop();
+
+  ASSERT_EQ(spy.count(), 1);
+  EXPECT_EQ(spy.at(0).at(0).toInt(), 42);
+}
+
+TEST(ConsumerThreadTest, ReceivesMultipleValues)
+{
+  const std::string sock = "/tmp/test_ct_multi.sock";
+
+  ConsumerThread consumer(sock);
+  QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+  consumer.start();
+
+  constexpr int kMessages = 5;
+  for (int i = 0; i < kMessages; ++i)
+  {
+    UnixIpcBridge bridge(sock);
+    bridge.send(i * 10);
+    // Small delay so the consumer can re-enter accept() between sends
+    std::this_thread::sleep_for(std::chrono::milliseconds(10));
+  }
+
+  // Wait until all signals arrive (or timeout after 5s)
+  for (int attempt = 0; spy.count() < kMessages && attempt < 50; ++attempt)
+  {
+    spy.wait(100);
+  }
+
+  consumer.stop();
+
+  ASSERT_EQ(spy.count(), kMessages);
+  for (int i = 0; i < kMessages; ++i)
+  {
+    EXPECT_EQ(spy.at(i).at(0).toInt(), i * 10);
+  }
+}
+
+TEST(ConsumerThreadTest, ReceivesNegativeAndZero)
+{
+  // Zero
+  {
+    const std::string sock = "/tmp/test_ct_zero.sock";
+    ConsumerThread consumer(sock);
+    QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+    consumer.start();
+
+    UnixIpcBridge bridge(sock);
+    bridge.send(0);
+
+    spy.wait(1000);
+    consumer.stop();
+
+    ASSERT_EQ(spy.count(), 1);
+    EXPECT_EQ(spy.at(0).at(0).toInt(), 0);
+  }
+
+  // Negative
+  {
+    const std::string sock = "/tmp/test_ct_neg.sock";
+    ConsumerThread consumer(sock);
+    QSignalSpy spy(&consumer, &ConsumerThread::valueReceived);
+    consumer.start();
+
+    UnixIpcBridge bridge(sock);
+    bridge.send(-999);
+
+    spy.wait(1000);
+    consumer.stop();
+
+    ASSERT_EQ(spy.count(), 1);
+    EXPECT_EQ(spy.at(0).at(0).toInt(), -999);
+  }
+}
+
+TEST(ConsumerThreadTest, StopsCleanlyWithoutDeadlock)
+{
+  const std::string sock = "/tmp/test_ct_stop.sock";
+
+  ConsumerThread consumer(sock);
+  consumer.start();
+  // stop() must return without hanging, even with no connections
+  consumer.stop();
+}
+
+TEST(ConsumerThreadTest, StopsCleanlyWhenNeverStarted)
+{
+  const std::string sock = "/tmp/test_ct_nostart.sock";
+
+  ConsumerThread consumer(sock);
+  // stop() on a consumer that was never started must not crash
+  consumer.stop();
+}