diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/default.nix b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/default.nix
index b3185140f2ea..ff9eed6bdeef 100644
--- a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/default.nix
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/default.nix
@@ -10,4 +10,6 @@ makeSetupHook {
   substitutions = {
     objdump = "${lib.getBin binutils-unwrapped}/${stdenv.targetPlatform.config}/bin/objdump";
   };
+
+  passthru.tests = callPackage ./tests { };
 } ./cygwin-dll-link.sh
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/default.nix b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/default.nix
new file mode 100644
index 000000000000..a8744001dc2d
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/default.nix
@@ -0,0 +1,130 @@
+{
+  dieHook,
+  lib,
+  stdenv,
+  testers,
+  runCommand,
+}:
+
+rec {
+  dll = stdenv.mkDerivation {
+    name = "dll";
+    src = ./dll;
+    outputs = [
+      "out"
+      "dev"
+    ];
+    buildInputs = [ dll2 ];
+    strictDeps = true;
+  };
+
+  dll2 = stdenv.mkDerivation {
+    name = "dll2";
+    src = ./dll2;
+    outputs = [
+      "out"
+      "dev"
+    ];
+  };
+
+  exe = stdenv.mkDerivation {
+    name = "exe";
+    src = ./exe;
+    buildInputs = [ dll ];
+    nativeBuildInputs = [ dieHook ];
+    strictDeps = true;
+    doCheck = true;
+    postFixup = ''[[ -e "$out"/bin/cyghello2.dll ]] || die missing indirect dependency'';
+  };
+
+  link-dll = exe.overrideAttrs {
+    name = "link-dll";
+    preFixup = ''
+      ln -s ${lib.getLib dll}/bin/cyghello.dll "$out"/bin/
+    '';
+  };
+
+  user32 = stdenv.mkDerivation {
+    name = "user32";
+    src = ./user32;
+    allowedImpureDLLs = [ "USER32.dll" ];
+  };
+
+  impure-dll = testers.testBuildFailure (
+    user32.overrideAttrs {
+      name = "impure-dll";
+      allowedImpureDLLs = [ ];
+    }
+  );
+
+  user32-dll = stdenv.mkDerivation {
+    name = "user32-dll";
+    src = ./user32-dll;
+    outputs = [
+      "out"
+      "dev"
+    ];
+    allowedImpureDLLs = [ "USER32.dll" ];
+  };
+
+  user32-exe = stdenv.mkDerivation {
+    name = "user32-exe";
+    src = ./user32-exe;
+    buildInputs = [ user32-dll ];
+    strictDeps = true;
+    doCheck = true;
+  };
+
+  link-dir-dll = exe.overrideAttrs {
+    name = "link-dir-dll";
+    preFixup = ''
+      mkdir "$out"/libexec
+      ln -s ${lib.getLib user32-dll}/bin/cygpeek.dll "$out"/libexec/
+      linkDLLsDir="$out"/bin linkDLLs "$out"/libexec/cygpeek.dll
+    '';
+  };
+
+  link-dir-exe = exe.overrideAttrs {
+    name = "link-dir-exe";
+    preFixup = ''
+      mkdir "$out"/libexec
+      ln -s ${lib.getLib user32-exe}/bin/{peek.exe,cygpeek.dll} "$out"/libexec/
+      linkDLLsDir="$out"/bin linkDLLs "$out"/libexec/peek.exe
+    '';
+  };
+
+  link-user32-dll = exe.overrideAttrs {
+    name = "link-user32-dll";
+    preFixup = ''
+      ln -s ${lib.getLib user32-dll}/bin/cygpeek.dll "$out"/bin/
+    '';
+  };
+
+  copy-dll-impure = testers.testBuildFailure (
+    user32-exe.overrideAttrs {
+      name = "copy-dll-impure";
+      preFixup = ''
+        cp ${lib.getLib user32-dll}/bin/cygpeek.dll "$out"/bin/
+      '';
+    }
+  );
+
+  copy-dll = user32-exe.overrideAttrs {
+    name = "copy-dll";
+    preFixup = ''
+      cp ${lib.getLib user32-dll}/bin/cygpeek.dll "$out"/bin/
+      linkDLLs "$out"/bin/cygpeek.dll
+    '';
+    allowedImpureDLLs = [ "USER32.dll" ];
+  };
+
+  double-link = user32-exe.overrideAttrs {
+    name = "double-link";
+    preFixup = ''linkDLLs "$out"'';
+  };
+
+  utf8-glob = runCommand "utf8-glob" { } ''
+    touch NetLock_Arany_=Class_Gold=_Főtanstvny:49412ce40010.crt
+    ls -l NetLock* > "$out"
+  '';
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/Makefile
new file mode 100644
index 000000000000..25e1e53c38e4
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/Makefile
@@ -0,0 +1,16 @@
+.PHONY: all install
+all: cyghello.dll
+
+install: $(out)/bin/cyghello.dll $(out)/lib/libhello.dll.a $(out)/include/hello.h
+
+cyghello.dll libhello.dll.a: hello.c
+	$(CC) -o $@ $^ -shared -Wl,--out-implib,libhello.dll.a -Wl,--export-all-symbols -lhello2
+
+$(out)/bin/cyghello.dll: cyghello.dll
+	install -m755 -D $< $@
+
+$(out)/lib/libhello.dll.a: libhello.dll.a
+	install -m644 -D $< $@
+
+$(out)/include/hello.h: hello.h
+	install -m644 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.c
new file mode 100644
index 000000000000..db1a301c91a4
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.c
@@ -0,0 +1,7 @@
+#include "hello.h"
+#include <stdio.h>
+#include <hello2.h>
+
+void hello() {
+				hello2();
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.h b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.h
new file mode 100644
index 000000000000..a4a0b54c6052
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll/hello.h
@@ -0,0 +1,2 @@
+#pragma once
+void hello();
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/Makefile
new file mode 100644
index 000000000000..87c5c1a9b9cc
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/Makefile
@@ -0,0 +1,16 @@
+.PHONY: all install
+all: cyghello2.dll
+
+install: $(out)/bin/cyghello2.dll $(out)/lib/libhello2.dll.a $(out)/include/hello2.h
+
+cyghello2.dll libhello2.dll.a: hello2.c
+	$(CC) -o $@ $^ -shared -Wl,--out-implib,libhello2.dll.a -Wl,--export-all-symbols
+
+$(out)/bin/cyghello2.dll: cyghello2.dll
+	install -m755 -D $< $@
+
+$(out)/lib/libhello2.dll.a: libhello2.dll.a
+	install -m644 -D $< $@
+
+$(out)/include/hello2.h: hello2.h
+	install -m644 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.c
new file mode 100644
index 000000000000..d23050fbb776
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+#include "hello2.h"
+
+void hello2() {
+				printf("Hello, World!\n");
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.h b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.h
new file mode 100644
index 000000000000..34e200a07e95
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/dll2/hello2.h
@@ -0,0 +1,2 @@
+#pragma once
+void hello2();
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/Makefile
new file mode 100644
index 000000000000..da16b5d08c79
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/Makefile
@@ -0,0 +1,13 @@
+.PHONY: all check install
+all: hello.exe
+
+install: $(out)/bin/hello.exe
+
+hello.exe: main.c
+	$(CC) -o $@ $^ -lhello
+
+check: hello.exe
+	./hello.exe
+
+$(out)/bin/hello.exe: hello.exe
+	install -m755 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/main.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/main.c
new file mode 100644
index 000000000000..9dbc882ea430
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/exe/main.c
@@ -0,0 +1,6 @@
+#include <hello.h>
+
+int main() {
+				hello();
+				return 0;
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/Makefile
new file mode 100644
index 000000000000..483ad8854a06
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/Makefile
@@ -0,0 +1,16 @@
+.PHONY: all install
+all: cygpeek.dll
+
+install: $(out)/bin/cygpeek.dll $(out)/lib/libpeek.dll.a $(out)/include/peek.h
+
+cygpeek.dll libpeek.dll.a: peek.c
+	$(CC) -o $@ $^ -shared -Wl,--out-implib,libpeek.dll.a -Wl,--export-all-symbols
+
+$(out)/bin/cygpeek.dll: cygpeek.dll
+	install -m755 -D $< $@
+
+$(out)/lib/libpeek.dll.a: libpeek.dll.a
+	install -m644 -D $< $@
+
+$(out)/include/peek.h: peek.h
+	install -m644 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.c
new file mode 100644
index 000000000000..715adb003c15
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.c
@@ -0,0 +1,7 @@
+#include <windows.h>
+
+int peek()
+{
+				MSG msg;
+				PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE);
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.h b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.h
new file mode 100644
index 000000000000..800f23f77da5
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-dll/peek.h
@@ -0,0 +1,2 @@
+#pragma once
+void peek();
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/Makefile
new file mode 100644
index 000000000000..231601818914
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/Makefile
@@ -0,0 +1,13 @@
+.PHONY: all check install
+all: peek.exe
+
+install: $(out)/bin/peek.exe
+
+peek.exe: main.c
+	$(CC) -o $@ $^ -lpeek
+
+check: peek.exe
+	./peek.exe
+
+$(out)/bin/peek.exe: peek.exe
+	install -m755 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/main.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/main.c
new file mode 100644
index 000000000000..cddc78c91cab
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32-exe/main.c
@@ -0,0 +1,6 @@
+#include <peek.h>
+
+int main() {
+				peek();
+				return 0;
+}
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/Makefile b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/Makefile
new file mode 100644
index 000000000000..6c696a2e8cd0
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/Makefile
@@ -0,0 +1,13 @@
+.PHONY: all check install
+all: hello.exe
+
+install: $(out)/bin/hello.exe
+
+hello.exe: main.c
+	$(CC) -o $@ $^
+
+check: hello.exe
+	./hello.exe
+
+$(out)/bin/hello.exe: hello.exe
+	install -m755 -D $< $@
diff --git a/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/main.c b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/main.c
new file mode 100644
index 000000000000..9cc135770d21
--- /dev/null
+++ b/pkgs/os-specific/cygwin/cygwin-dll-link-hook/tests/user32/main.c
@@ -0,0 +1,7 @@
+#include <windows.h>
+
+int main()
+{
+				MSG msg;
+				PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE);
+}