diff --git a/tests/test_helpers.h b/tests/test_helpers.h
new file mode 100644
--- /dev/null
+++ b/tests/test_helpers.h
@@ -0,0 +1,86 @@
+#ifndef TEST_HELPERS_H
+#define TEST_HELPERS_H
+
+#include "source.h"
+#include "sink.h"
+
+class TestSink : public Sink
+{
+public:
+    int totalFed;
+    int _numChannels;
+    bool _hasX;
+
+    TestSink()
+        {
+            totalFed = 0;
+            _numChannels = 0;
+            _hasX = false;
+        };
+
+    void feedIn(const SamplePack& data)
+        {
+            REQUIRE(data.numChannels() == numChannels());
+
+            totalFed += data.numSamples();
+
+            Sink::feedIn(data);
+        };
+
+    void setNumChannels(unsigned nc, bool x)
+        {
+            _numChannels = nc;
+            _hasX = x;
+
+            Sink::setNumChannels(nc, x);
+        };
+
+    virtual unsigned numChannels() const
+        {
+            return _numChannels;
+        };
+
+    virtual bool hasX() const
+        {
+            return _hasX;
+        };
+};
+
+class TestSource : public Source
+{
+public:
+    int _numChannels;
+    bool _hasX;
+
+    TestSource(unsigned nc, bool x)
+        {
+            _numChannels = nc;
+            _hasX = x;
+        };
+
+    virtual unsigned numChannels() const
+        {
+            return _numChannels;
+        };
+
+    virtual bool hasX() const
+        {
+            return _hasX;
+        };
+
+    void _feed(const SamplePack& data) const
+        {
+            feedOut(data);
+        };
+
+    void _setNumChannels(unsigned nc, bool x)
+        {
+            _numChannels = nc;
+            _hasX = x;
+
+            updateNumChannels();
+        };
+};
+
+
+#endif // TEST_HELPERS_H