diff --git a/Project.toml b/Project.toml
index 0fad4be..a4e74c8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -21,6 +21,7 @@ Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 bsdiff_classic_jll = "7424abe3-9926-5da8-9b28-863d6330819c"
 bsdiff_endsley_jll = "4b92dbe6-3cad-5173-b451-9946eb17ce71"
+zrl_jll = "9fe51eb0-a099-5680-98c2-fe494cf0c162"
 
 [targets]
-test = ["Pkg", "Test", "bsdiff_classic_jll", "bsdiff_endsley_jll"]
+test = ["Pkg", "Test", "bsdiff_classic_jll", "bsdiff_endsley_jll", "zrl_jll"]
diff --git a/test/runtests.jl b/test/runtests.jl
index 291ec39..7fb81a3 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -4,6 +4,7 @@ using Pkg.Artifacts
 
 import bsdiff_classic_jll
 import bsdiff_endsley_jll
+import zrl_jll
 
 const test_data = artifact"test_data"
 const FORMATS = sort!(collect(keys(BSDiff.FORMATS)))
@@ -56,15 +57,36 @@ const FORMATS = sort!(collect(keys(BSDiff.FORMATS)))
         ref = joinpath(registry_data, "reference.diff")
         old_data = read(old)
         new_data = read(new)
-        @testset "hi-level API" for format in FORMATS
+        @testset "hi-level API (w/ timing)" for format in FORMATS
+            println("[ raw data ]")
             @show format
             index = bsindex(old)
             patch = @time bsdiff((old, index), new, format = format)
             patch = @time bsdiff((old, index), new, format = format)
             patch = @time bsdiff((old, index), new, format = format)
             new′ = bspatch(old, patch)
+            @test read(new) == read(new′)
             @show filesize(patch)
         end
+        @testset "ZRL data (w/timing)" for format in FORMATS
+            println("[ ZRL data ]")
+            @show format
+            old_zrl = tempname()
+            new_zrl = tempname()
+            zrl_jll.zrle() do zrle
+                run(pipeline(`$zrle $old`, old_zrl))
+                run(pipeline(`$zrle $new`, new_zrl))
+            end
+            index = bsindex(old_zrl)
+            patch = @time bsdiff((old_zrl, index), new_zrl, format = format)
+            patch = @time bsdiff((old_zrl, index), new_zrl, format = format)
+            patch = @time bsdiff((old_zrl, index), new_zrl, format = format)
+            new_zrl′ = bspatch(old_zrl, patch)
+            @test read(new_zrl) == read(new_zrl′)
+            @show filesize(patch)
+            rm(old_zrl)
+            rm(new_zrl)
+        end
         @testset "low-level API" begin
             # test that diff is identical to reference diff
             index = BSDiff.generate_index(old_data)