Test: add coverage for sample generators

Refs: #18

CMakeLists.txt

@@ -25,13 +25,16 @@ enable_testing()
 add_executable(wtpp_test tests/wtpp_test.cpp)
 add_executable(wave_test tests/wave_test.cpp)
 add_executable(wavetable_test tests/wavetable_test.cpp)
+add_executable(generators_test tests/generators_test.cpp)
 
 target_link_libraries(wtpp_test GTest::gtest_main)
 target_link_libraries(wave_test GTest::gtest_main)
 target_link_libraries(wavetable_test GTest::gtest_main)
+target_link_libraries(generators_test generators GTest::gtest_main)
 
 include(GoogleTest)
 
 gtest_discover_tests(wtpp_test)
 gtest_discover_tests(wave_test)
 gtest_discover_tests(wavetable_test)
+gtest_discover_tests(generators_test)

tests/generators_test.cpp

@@ -0,0 +1,35 @@
+#include "../src/generators.h"
+#include "gtest/gtest.h"
+
+TEST(Generator, SineWave)
+{
+  sample_table_t t = gen_sin();
+  // Starts at 0
+  EXPECT_EQ(t[0], 0);
+}
+
+TEST(Generator, SquareWave) {
+  sample_table_t t = gen_squ();
+  // Starts at 1
+  EXPECT_EQ(t[0], 1);
+  // Ends at -1
+  EXPECT_EQ(t[DEFAULT_N_SAMPLES - 1], -1);
+}
+
+TEST(Generator, SawWave) {
+  sample_table_t t = gen_saw();
+  // Starts at -1
+  EXPECT_EQ(t[0], -1);
+}
+
+TEST(Generator, TriangleWave) {
+  sample_table_t t = gen_tri();
+  // Starts at -1
+  EXPECT_EQ(t[0], -1);
+}
+
+TEST(Generator, InverseSawWave) {
+  sample_table_t t = gen_isaw();
+  // Starts at 1
+  EXPECT_EQ(t[0], 1);
+}