diff --git a/src/ms_filter.jl b/src/ms_filter.jl
index 9ad8536..8c17838 100644
--- a/src/ms_filter.jl
+++ b/src/ms_filter.jl
@@ -84,7 +84,7 @@ function RadiationDetectorDSP.rdfilt!(output::AbstractVector,
     @inbounds for i in eachindex(input)
         center = fi.m + i
         sum = fma(kernel[1], _y[center], sum)
-        @simd for j in Base.OneTo(length(kernel)-1)
+        @simd for j in Base.OneTo(length(kernel)-2)
             k_j = kernel[j+1]
             sum = fma(k_j, _y[center + j+1], sum)
             sum = fma(k_j, _y[center - (j+1)], sum)
diff --git a/test/runtests.jl b/test/runtests.jl
index 812f79d..619072d 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -8,5 +8,8 @@ Test.@testset "Package LegendDSP" begin
     # include("test_SOMETHING.jl")
     include("test_multiintersect.jl")
     include("test_docs.jl")
+    include("test_ms_filter.jl")
+    include("test_sgw_filter.jl")
+    include("test_wh_filter.jl")
     isempty(Test.detect_ambiguities(LegendDSP))
 end # testset
diff --git a/test/test_ms_filter.jl b/test/test_ms_filter.jl
new file mode 100644
index 0000000..8492e32
--- /dev/null
+++ b/test/test_ms_filter.jl
@@ -0,0 +1,19 @@
+using Test
+using LegendDSP
+using RadiationDetectorDSP
+using RadiationDetectorSignals
+using Unitful
+
+@testset "Test ModifiedSincFilter" begin
+    n = 600
+    noise = 1.
+    t = range(0u"μs", 20u"μs", 2*n)
+    signal = vcat(zeros(n), 10*ones(n)) + (noise*rand(2*n) .- noise/2)
+    wf = RDWaveform(t, signal)
+    
+    # define filter parameters and filter
+    flt = ModifiedSincFilter(d=4, m=1u"μs")
+    
+    # apply filter to signal
+    @test_nowarn wf_new = flt(wf)
+end
\ No newline at end of file
diff --git a/test/test_sgw_filter.jl b/test/test_sgw_filter.jl
new file mode 100644
index 0000000..8d96e53
--- /dev/null
+++ b/test/test_sgw_filter.jl
@@ -0,0 +1,19 @@
+using Test
+using LegendDSP
+using RadiationDetectorDSP
+using RadiationDetectorSignals
+using Unitful
+
+@testset "Test WeightedSavitzkyGolayFilter" begin
+    n = 600
+    noise = 1.
+    t = range(0u"μs", 20u"μs", 2*n)
+    signal = vcat(zeros(n), 10*ones(n)) + (noise*rand(2*n) .- noise/2)
+    wf = RDWaveform(t, signal)
+
+    # define filter parameters and filter
+    flt = WeightedSavitzkyGolayFilter(length=1u"μs", degree=3, weightType=2)
+
+    # apply filter to signal
+    @test_nowarn wf_new = flt(wf)
+end
\ No newline at end of file
diff --git a/test/test_wh_filter.jl b/test/test_wh_filter.jl
new file mode 100644
index 0000000..3dbd571
--- /dev/null
+++ b/test/test_wh_filter.jl
@@ -0,0 +1,19 @@
+using Test
+using LegendDSP
+using RadiationDetectorDSP
+using RadiationDetectorSignals
+using Unitful
+
+@testset "Test WhittakerHendersonFilter" begin
+    n = 600
+    noise = 1.
+    t = range(0u"μs", 20u"μs", 2*n)
+    signal = vcat(zeros(n), 10*ones(n)) + (noise*rand(2*n) .- noise/2)
+    wf = RDWaveform(t, signal)
+
+    # define filter parameters and filter
+    flt = WhittakerHendersonFilter(p=3, λ=4)
+
+    # apply filter to signal
+    @test_nowarn wf_new = flt(wf)
+end
\ No newline at end of file