diff --git a/test/BetaSchedules.jl b/test/BetaSchedules.jl
new file mode 100644
index 0000000..82dc8d1
--- /dev/null
+++ b/test/BetaSchedules.jl
@@ -0,0 +1,18 @@
+using Diffusers.BetaSchedules
+using Test
+
+@testset "Variance schedules tests" begin
+  @testset "β increases monotonically" begin
+    T = 1000
+
+    β_linear = linear_beta_schedule(T)
+    β_scaled_linear = scaled_linear_beta_schedule(T)
+    β_cosine = cosine_beta_schedule(T)
+    β_sigmoid = sigmoid_beta_schedule(T)
+
+    @test all(diff(β_linear) .>= 0)
+    @test all(diff(β_scaled_linear) .>= 0)
+    @test all(diff(β_cosine) .>= 0)
+    @test all(diff(β_sigmoid) .>= 0)
+  end
+end
diff --git a/test/runtests.jl b/test/runtests.jl
index 6cc9197..3a7ab0d 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -2,3 +2,5 @@ using Diffusers
 using Aqua
 
 Aqua.test_all(Diffusers)
+
+include("BetaSchedules.jl")