diff --git a/test/test.jl b/test/test.jl
index 3b9b4a6b..6f2b3212 100644
--- a/test/test.jl
+++ b/test/test.jl
@@ -68,6 +68,8 @@ include("testdata.jl")
     @test Metida.nblocks(lmm) == 5
     @test length(coefnames(lmm)) == 6
     @test Metida.confint(lmm)[end][1] ≈ -0.7630380758015894 atol=1E-4
+    @test Metida.confint(lmm; ddf = :residual)[end][1] ≈ -0.6740837049617738 atol=1E-4
+    Metida.confint(lmm; ddf = :contain)[end][1]
     @test size(crossmodelmatrix(lmm), 1) == 6
     @test anovatable.pval[4]          ≈ 0.7852154468081014 atol=1E-6
     ############################################################################