diff --git a/test/test-brighten.jl b/test/test-brighten.jl
new file mode 100644
index 00000000..2b29fd88
--- /dev/null
+++ b/test/test-brighten.jl
@@ -0,0 +1,22 @@
+using IceFloeTracker: get_brighten_mask, imbrighten
+
+@testset "brighten tests" begin
+    @testset "get_brighten_mask" begin
+        img = rand(0:255, 5, 5)
+        bumped_img = img .+ 1
+        mask = get_brighten_mask(img, bumped_img)
+        @test all(mask .== 0)
+    end
+
+    @testset "imbrighten tests" begin
+        img = [1 2; 3 4]
+        brighten_mask = [1 0; 1 0]
+
+        test_cases = [(1.25, [1 2; 4 4]), (0.1, [0 2; 0 4]), (0.9, img)]
+
+        for (bright_factor, expected_result) in test_cases
+            result = imbrighten(img, brighten_mask, bright_factor)
+            @test result == expected_result
+        end
+    end
+end
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