diff --git a/.gitignore b/.gitignore
index a41989f..1050030 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@ tests/sgpc3-test-hw_i2c
 tests/sgpc3-test-sw_i2c
 tests/svm30-test-hw_i2c
 tests/svm30-test-sw_i2c
+tests/sensirion-voc-algorithm-test
diff --git a/tests/Makefile b/tests/Makefile
index d50fa75..cc37ed3 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -8,7 +8,9 @@ include ${sgp_driver_dir}/sgpc3/default_config.inc
 
 sgp30_test_binaries := sgp30-test-hw_i2c sgp30-test-sw_i2c
 sgp40_test_binaries := sgp40-test-hw_i2c sgp40-test-sw_i2c
-sgp40_voc_index_test_binaries := sgp40-voc-index-test-hw_i2c sgp40-voc-index-test-sw_i2c
+sgp40_voc_index_test_binaries := sgp40-voc-index-test-hw_i2c \
+                                 sgp40-voc-index-test-sw_i2c \
+                                 sensirion-voc-algorithm-test
 sgpc3_test_binaries := sgpc3-test-hw_i2c sgpc3-test-sw_i2c
 svm30_test_binaries := svm30-test-hw_i2c svm30-test-sw_i2c
 sgp_test_binaries := ${sgp30_test_binaries} \
@@ -48,6 +50,9 @@ sgp40-voc-index-test-sw_i2c: CONFIG_I2C_TYPE := sw_i2c
 sgp40-voc-index-test-sw_i2c: sgp40-voc-index-test.cpp ${sgp40_voc_index_sources} ${sw_i2c_sources} ${sensirion_test_sources}
 	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
 
+sensirion-voc-algorithm-test: sensirion-voc-algorithm-test.cpp ${sgp40_voc_index_voc_algorithm_sources}
+	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
+
 sgpc3-test-hw_i2c: CONFIG_I2C_TYPE := hw_i2c
 sgpc3-test-hw_i2c: sgpc3-test.cpp ${sgpc3_sources} ${hw_i2c_sources} ${sensirion_test_sources}
 	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
diff --git a/tests/sensirion-voc-algorithm-test.cpp b/tests/sensirion-voc-algorithm-test.cpp
new file mode 100644
index 0000000..c95843a
--- /dev/null
+++ b/tests/sensirion-voc-algorithm-test.cpp
@@ -0,0 +1,32 @@
+#include "CppUTest/CommandLineTestRunner.h"
+#include "sensirion_voc_algorithm.h"
+
+TEST_GROUP (Sgp40VocIndexAlgorithmTest) {};
+
+TEST (Sgp40VocIndexAlgorithmTest, returns_zero_during_blackout) {
+    VocAlgorithmParams params;
+    VocAlgorithm_init(&params);
+    for (int i = 0; i < VocAlgorithm_INITIAL_BLACKOUT; ++i) {
+        int32_t voc_index;
+        VocAlgorithm_process(&params, 0, &voc_index);
+        CHECK_EQUAL_TEXT(0, voc_index,
+                         "VOC index should be 0 during initial blackout");
+    }
+}
+
+TEST (Sgp40VocIndexAlgorithmTest, returns_average_after_blackout) {
+    VocAlgorithmParams params;
+    VocAlgorithm_init(&params);
+    int32_t voc_index;
+    for (int i = 0; i < VocAlgorithm_INITIAL_BLACKOUT + 2; ++i) {
+        VocAlgorithm_process(&params, 0, &voc_index);
+    }
+
+    CHECK_EQUAL_TEXT(
+        VocAlgorithm_VOC_INDEX_OFFSET_DEFAULT, voc_index,
+        "VOC index should be the offset default after the the blackout period");
+}
+
+int main(int argc, char** argv) {
+    return CommandLineTestRunner::RunAllTests(argc, argv);
+}