diff --git a/phpunit/data/themedir1/block-theme-child-with-fluid-typography/style.css b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/style.css
new file mode 100644
index 00000000000000..19abbecf86f4cc
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+++ b/phpunit/data/themedir1/block-theme-child-with-fluid-typography/style.css
@@ -0,0 +1,8 @@
+/*
+Theme Name: Block Theme Child Theme With Fluid Typography
+Theme URI: https://wordpress.org/
+Description: For testing purposes only.
+Template: block-theme
+Version: 1.0.0
+Text Domain: block-theme-child-with-fluid-typography
+*/