diff --git a/tests/testthat/test-PROPR-updatepermutes.R b/tests/testthat/test-PROPR-updatepermutes.R
new file mode 100644
index 0000000..88b956f
--- /dev/null
+++ b/tests/testthat/test-PROPR-updatepermutes.R
@@ -0,0 +1,52 @@
+library(testthat)
+library(propr)
+
+N <- 100
+a <- seq(from = 5, to = 15, length.out = N)
+b <- a * rnorm(N, mean = 1, sd = 0.1)
+c <- rnorm(N, mean = 10)
+d <- rnorm(N, mean = 10)
+e <- rep(10, N)
+X <- data.frame(a, b, c, d, e)
+
+# compute pcor.bshrink without fixed seed
+pcorbshrink1 <- propr(X, metric = "pcor.bshrink", p=10)
+pcorbshrink1 <- updateCutoffs(pcorbshrink1)
+
+pcorbshrink2 <- propr(X, metric = "pcor.bshrink", p=10)
+pcorbshrink2 <- updateCutoffs(pcorbshrink2)
+
+# compute pcor.bshrink with fixed seed
+pcorbshrink1_ <- propr(X, metric = "pcor.bshrink", p=10, fixseed=TRUE)
+pcorbshrink1_ <- updateCutoffs(pcorbshrink1_)
+
+pcorbshrink2_ <- propr(X, metric = "pcor.bshrink", p=10, fixseed=TRUE)
+pcorbshrink2_ <- updateCutoffs(pcorbshrink2_)
+
+# test that the results are as expected
+test_that("test that fdr will stay the same only if fixseed=TRUE", {
+
+  expect_false(
+    isTRUE(all.equal(
+        pcorbshrink1@permutes,
+        pcorbshrink2@permutes
+    ))
+  )
+
+  expect_false(
+    isTRUE(all.equal(
+        pcorbshrink1@fdr,
+        pcorbshrink2@fdr
+    ))
+  )
+
+  expect_equal(
+    pcorbshrink1_@permutes,
+    pcorbshrink2_@permutes
+  )
+
+  expect_equal(
+    pcorbshrink1_@fdr,
+    pcorbshrink2_@fdr
+  )
+})
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