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diff --git a/alpha_division_effect_test.cpp b/alpha_division_effect_test.cpp
new file mode 100644
index 0000000..8c29702
--- /dev/null
+++ b/alpha_division_effect_test.cpp
@@ -0,0 +1,35 @@
+// Unit tests for AlphaDivisionEffect.
+
+#include "test_util.h"
+#include "gtest/gtest.h"
+
+TEST(AlphaDivisionEffectTest, SimpleTest) {
+	const int size = 2;
+	float data[4 * size] = {
+		0.1f, 0.5f, 0.1f, 0.5f,
+		0.2f, 0.2f, 1.0f, 1.0f,
+	};
+	float expected_data[4 * size] = {
+		0.2f, 1.0f, 0.2f, 0.5f,
+		0.2f, 0.2f, 1.0f, 1.0f,
+	};
+	float out_data[4 * size];
+	EffectChainTester tester(data, 1, size, FORMAT_RGBA_PREMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, 4, size);
+}
+
+TEST(AlphaDivisionEffectTest, ZeroAlphaIsPreserved) {
+	const int size = 2;
+	float data[4 * size] = {
+		0.1f, 0.5f, 0.1f, 0.0f,
+		0.0f, 0.0f, 0.0f, 0.0f,
+	};
+	float out_data[4 * size];
+	EffectChainTester tester(data, 1, size, FORMAT_RGBA_PREMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+	tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	EXPECT_EQ(0.0f, out_data[3]);
+	EXPECT_EQ(0.0f, out_data[7]);
+}