diff --git a/delay/tests/test_buffer.cpp b/delay/tests/test_buffer.cpp
index b3299be..38810a0 100644
--- a/delay/tests/test_buffer.cpp
+++ b/delay/tests/test_buffer.cpp
@@ -14,18 +14,21 @@ int test_buffer_1()
 
 	dsp::Buffer<int> buffer(10);
 	printf("Buffer capacity = %zu\n", buffer.capacity());
-	for (int i=0; i < 10; i++)
+	for (int i=0; i < buffer.capacity(); i++)
 	{
 		buffer[i] = i+100;
 	}
 	buffer += 5;
 
+	{
+		dsp::Buffer<int> t_buf{105, 106, 107, 108, 109};
+		check(buffer, t_buf, t_buf.capacity());
+	}
 	dsp::Buffer<int> res_buf(5);
 	for (int i=0; i < res_buf.capacity(); i++)
 	{
 		int v = buffer[i-5];
 		res_buf[i] = v;
-		printf("i=%d: v=%d\n", i, v);
 	}
 	dsp::Buffer<int> t_buf{100, 101, 102, 103, 104};
 	
@@ -47,21 +50,12 @@ int test_buffer_2()
 	std::cout << "Start test_buffer_2" << std::endl;
 	std::cout << "----------------------------------------------" << std::endl;
 
-	dsp::Buffer<int> buffer(10);
+	dsp::Buffer<int> buffer(5);
 	printf("Buffer capacity = %zu\n", buffer.capacity());
-	for (int i=0; i < 10; i++)
+	for (int i=0; i < buffer.capacity(); i++)
 	{
 		buffer[i] = i+100;
 	}
-	buffer += 5;
-
-	for (int i=-5; i < 5; i++)
-	{
-		int v = buffer[i];
-		printf("i=%d: v=%d\n", i, v);
-	}
-
-	buffer.reset();
 	const auto v1 = dsp::Buffer<int>(buffer, -1);
 	const auto v2 = dsp::Buffer<int>(buffer, -5);
 
diff --git a/delay/tests/test_common.hpp b/delay/tests/test_common.hpp
index e02c75f..131e230 100644
--- a/delay/tests/test_common.hpp
+++ b/delay/tests/test_common.hpp
@@ -1,3 +1,4 @@
+#include <cmath>
 #include <delay/buffer_multi.hpp>
 #include <delay/buffer.hpp>
 #include <cstdio>
@@ -21,15 +22,38 @@ void print(const dsp::Buffer<T> &v, size_t size, std::string name=std::string(""
 }
 
 template<typename T>
-void check(const dsp::Buffer<T> &target, const dsp::Buffer<T> &actual)
+void check(const dsp::Buffer<T> &target, const dsp::Buffer<T> &actual, size_t size=0)
 {
-	if (!(target == actual))
+	bool success = false;
+	do
+	{
+		if (size == 0)
+		{
+			if (target.capacity() != actual.capacity())
+			{
+				break;
+			}
+			size = target.capacity();
+		}
+
+		for (int i=0; i < size; i++)
+		{
+			if (target[i] != actual[i])
+			{
+				break;
+			}
+		}
+		success = true;
+		
+	} while(false);
+
+	if (!success)
 	{
 		std::cout << "Check failed" << std::endl;
 		print(target, target.capacity(), "Target");
 		print(actual, actual.capacity(), "Actual");
 	}
-	assert(target == actual);
+	assert(success);
 }
 
 #endif
\ No newline at end of file