diff --git a/MANIFEST b/MANIFEST
index ca3e007eb8..49ed46e4d0 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -983,6 +983,12 @@ t/daemon/api/port.xml
 t/daemon/citations.tex
 t/daemon/complex/exhaustive.spec
 t/daemon/complex/exhaustive.xml
+t/daemon/complex/testlocks.spec
+t/daemon/complex/testlocks.tex
+t/daemon/complex/testlocks.xml
+t/daemon/complex/testlocks.sty.ltxml
+t/daemon/complex/testlocks-a.sty
+t/daemon/complex/testlocks-b.sty.ltxml
 t/daemon/document.tex
 t/daemon/fatal_100.tex
 t/daemon/fatal_misdefined.tex
diff --git a/t/daemon/complex/testlocks-a.sty b/t/daemon/complex/testlocks-a.sty
new file mode 100644
index 0000000000..a0352d4aac
--- /dev/null
+++ b/t/daemon/complex/testlocks-a.sty
@@ -0,0 +1,4 @@
+
+% Ignored attempt to redefine \fooC
+\def\fooC{testlocks-a FOO-C}
+\RequirePackage{testlocks-b};
diff --git a/t/daemon/complex/testlocks-b.sty.ltxml b/t/daemon/complex/testlocks-b.sty.ltxml
new file mode 100644
index 0000000000..57d446bba7
--- /dev/null
+++ b/t/daemon/complex/testlocks-b.sty.ltxml
@@ -0,0 +1,12 @@
+package LaTeXML::Package::Pool;
+use strict;
+use warnings;
+use LaTeXML::Package;
+
+# RE-defintions (allowed)
+DefMacro('\fooD', "testlocks-b FOO-D", locked => 1);
+
+# Definition, BUT will be RE-defined by testlocks.sty
+DefMacro('\fooE', "testlocks-b FOO-E", locked => 1);
+
+1;
diff --git a/t/daemon/complex/testlocks.spec b/t/daemon/complex/testlocks.spec
new file mode 100644
index 0000000000..4e0c745dc0
--- /dev/null
+++ b/t/daemon/complex/testlocks.spec
@@ -0,0 +1,3 @@
+preload = testlocks.sty
+source = testlocks.tex
+format = xml
diff --git a/t/daemon/complex/testlocks.sty.ltxml b/t/daemon/complex/testlocks.sty.ltxml
new file mode 100644
index 0000000000..776abfc4f5
--- /dev/null
+++ b/t/daemon/complex/testlocks.sty.ltxml
@@ -0,0 +1,16 @@
+package LaTeXML::Package::Pool;
+use strict;
+use warnings;
+use LaTeXML::Package;
+
+DefMacro('\fooA', "testlocks FOO-A", locked => 1);
+DefMacro('\fooB', "testlocks FOO-B", locked => 1);
+DefMacro('\fooC', "testlocks FOO-C", locked => 1);
+DefMacro('\fooD', "testlocks FOO-D", locked => 1);
+
+InputDefinitions("testlocks-a", type => 'sty', noltxml => 1);
+
+# This gets defined in testlocks-b.sty.ltxml, input from testlocks-a.sty
+DefMacro('\fooE', "testlocks FOO-E", locked => 1);
+
+1;
diff --git a/t/daemon/complex/testlocks.tex b/t/daemon/complex/testlocks.tex
new file mode 100644
index 0000000000..f9ba30a531
--- /dev/null
+++ b/t/daemon/complex/testlocks.tex
@@ -0,0 +1,16 @@
+\documentclass{article}
+%\usepackage{testlocks}
+% Ignored re-definition
+\def\fooB{Locak FOO-B}
+\begin{document}
+testlocks FOO-A:\fooA
+
+testlocks FOO-B:\fooB
+
+testlocks FOO-C:\fooC
+
+testlocks-b FOO-D:\fooD
+
+testlocks FOO-E:\fooE
+
+\end{document}
\ No newline at end of file
diff --git a/t/daemon/complex/testlocks.xml b/t/daemon/complex/testlocks.xml
new file mode 100644
index 0000000000..fcd3e1f258
--- /dev/null
+++ b/t/daemon/complex/testlocks.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?latexml package="testlocks"?>
+<?latexml class="article"?>
+<?latexml RelaxNGSchema="LaTeXML"?>
+<document xmlns="http://dlmf.nist.gov/LaTeXML">
+  <resource src="LaTeXML.css" type="text/css"/>
+  <resource src="ltx-article.css" type="text/css"/>
+  <para xml:id="p1">
+    <p>testlocks FOO-A:testlocks FOO-A</p>
+  </para>
+  <para xml:id="p2">
+    <p>testlocks FOO-B:testlocks FOO-B</p>
+  </para>
+  <para xml:id="p3">
+    <p>testlocks FOO-C:testlocks FOO-C</p>
+  </para>
+  <para xml:id="p4">
+    <p>testlocks-b FOO-D:testlocks-b FOO-D</p>
+  </para>
+  <para xml:id="p5">
+    <p>testlocks FOO-E:testlocks FOO-E</p>
+  </para>
+</document>