diff --git a/tests/format/markdown/heading/setext/__snapshots__/format.test.js.snap b/tests/format/markdown/heading/setext/__snapshots__/format.test.js.snap
index acea7cc32..c6a771e46 100644
--- a/tests/format/markdown/heading/setext/__snapshots__/format.test.js.snap
+++ b/tests/format/markdown/heading/setext/__snapshots__/format.test.js.snap
@@ -107,6 +107,23 @@ Heading
 ================================================================================
 `;
 
+exports[`issue-19148.md format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+Foo
+Bar
+---
+
+=====================================output=====================================
+Foo
+Bar
+---
+
+================================================================================
+`;
+
 exports[`setext.md format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
diff --git a/tests/format/markdown/heading/setext/issue-19148.md b/tests/format/markdown/heading/setext/issue-19148.md
new file mode 100644
index 000000000..0df98e2fc
--- /dev/null
+++ b/tests/format/markdown/heading/setext/issue-19148.md
@@ -0,0 +1,3 @@
+Foo
+Bar
+---