Added new test which tests for bad frequency input from the user.

test/CMakeLists.txt

@@ -20,3 +20,7 @@ add_test(TestChebyshev2 test_chebyshev2)
 add_executable (test_rbj rbj.cpp)
 target_link_libraries(test_rbj iir_static)
 add_test(TestRBJ test_rbj)
+
+add_executable (test_badparam badparam.cpp)
+target_link_libraries(test_badparam iir_static)
+add_test(TestBadParam test_badparam)

test/badparam.cpp

@@ -0,0 +1,46 @@
+#include "Iir.h"
+
+#include <stdio.h>
+
+#include "assert_print.h"
+
+int main (int,char**)
+{
+	// dummy filter parameters
+	const float samplingrate = 1000;
+	const float bw = 5;
+
+	try {
+		Iir::Butterworth::LowPass<3> f;
+		f.setup (samplingrate, samplingrate / 2);
+		assert_print(0,"No exception thrown by LowPass.");
+	} catch ( const std::invalid_argument& e ) {
+		fprintf(stderr,"Correct lowpass exception thrown for fc = fs/2: %s\n",e.what());
+	}
+
+	try {
+		Iir::Butterworth::HighPass<3> f;
+		f.setup (samplingrate, samplingrate / 2);
+		assert_print(0,"No exception thrown by HighPass.");
+	} catch ( const std::invalid_argument& e ) {
+		fprintf(stderr,"Correct highpass exception thrown for fc = fs/2: %s\n",e.what());
+	}
+
+	try {
+		Iir::Butterworth::BandStop<3> f;
+		f.setup (samplingrate, samplingrate / 2, bw);
+		assert_print(0,"No exception thrown by BandStop.");
+	} catch ( const std::invalid_argument& e ) {
+		fprintf(stderr,"Correct bandstop exception thrown for fc = fs/2: %s\n",e.what());
+	}
+
+	try {
+		Iir::Butterworth::BandPass<3> f;
+		f.setup (samplingrate, samplingrate / 2, bw);
+		assert_print(0,"No exception thrown by BandPass.");
+	} catch ( const std::invalid_argument& e ) {
+		fprintf(stderr,"Correct bandpass exception thrown for fc = fs/2: %s\n",e.what());
+	}
+
+	return 0;
+}