test/test_mixramp: unit test for mixramp_interpolate()

test/test_mixramp.cxx

@@ -0,0 +1,82 @@
+/*
+ * Unit tests for mixramp_interpolate()
+ */
+
+#include "config.h"
+#include "CrossFade.cxx"
+
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/TestFactoryRegistry.h>
+#include <cppunit/ui/text/TestRunner.h>
+#include <cppunit/extensions/HelperMacros.h>
+
+#include <string.h>
+
+class MixRampTest : public CppUnit::TestFixture {
+	CPPUNIT_TEST_SUITE(MixRampTest);
+	CPPUNIT_TEST(TestInterpolate);
+	CPPUNIT_TEST_SUITE_END();
+
+public:
+	void TestInterpolate() {
+		const char *input = "1.0 0.00;3.0 0.10;6.0 2.50;";
+
+		char *foo = strdup(input);
+		CPPUNIT_ASSERT(!std::isnan(mixramp_interpolate(foo, 0)));
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_EQUAL(float(0),
+				     mixramp_interpolate(foo, 1));
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_EQUAL(float(0.1),
+				     mixramp_interpolate(foo, 3));
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_EQUAL(float(2.5),
+				     mixramp_interpolate(foo, 6));
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT(!std::isnan(mixramp_interpolate(foo, 3)));
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_DOUBLES_EQUAL(float(0.05),
+					     mixramp_interpolate(foo, 2),
+					     0.05);
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_DOUBLES_EQUAL(float(1.3),
+					     mixramp_interpolate(foo, 4.5),
+					     0.05);
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_DOUBLES_EQUAL(float(0.9),
+					     mixramp_interpolate(foo, 4),
+					     0.05);
+		free(foo);
+
+		foo = strdup(input);
+		CPPUNIT_ASSERT_DOUBLES_EQUAL(float(1.7),
+					     mixramp_interpolate(foo, 5),
+					     0.05);
+		free(foo);
+	}
+};
+
+CPPUNIT_TEST_SUITE_REGISTRATION(MixRampTest);
+
+int
+main(gcc_unused int argc, gcc_unused char **argv)
+{
+	CppUnit::TextUi::TestRunner runner;
+	auto &registry = CppUnit::TestFactoryRegistry::getRegistry();
+	runner.addTest(registry.makeTest());
+	return runner.run() ? EXIT_SUCCESS : EXIT_FAILURE;
+}