diff --git a/tests/test_cases/input/unicode_escaped_h1_fail.kdl b/tests/test_cases/input/unicode_escaped_h1_fail.kdl
new file mode 100644
index 00000000..89597ea7
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_h1_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates high\u{D800}"
diff --git a/tests/test_cases/input/unicode_escaped_h2_fail.kdl b/tests/test_cases/input/unicode_escaped_h2_fail.kdl
new file mode 100644
index 00000000..a22f719a
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_h2_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates high\u{D911}"
diff --git a/tests/test_cases/input/unicode_escaped_h3_fail.kdl b/tests/test_cases/input/unicode_escaped_h3_fail.kdl
new file mode 100644
index 00000000..82345452
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_h3_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates high\u{DABB}"
diff --git a/tests/test_cases/input/unicode_escaped_h4_fail.kdl b/tests/test_cases/input/unicode_escaped_h4_fail.kdl
new file mode 100644
index 00000000..027446e3
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_h4_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates high\u{DBFF}"
diff --git a/tests/test_cases/input/unicode_escaped_l1_fail.kdl b/tests/test_cases/input/unicode_escaped_l1_fail.kdl
new file mode 100644
index 00000000..4b444d60
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_l1_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates low\u{DC00}"
diff --git a/tests/test_cases/input/unicode_escaped_l2_fail.kdl b/tests/test_cases/input/unicode_escaped_l2_fail.kdl
new file mode 100644
index 00000000..2d8017ca
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_l2_fail.kdl
@@ -0,0 +1 @@
+no "Surrogates low\u{DEAD}"
diff --git a/tests/test_cases/input/unicode_escaped_l3_fail.kdl b/tests/test_cases/input/unicode_escaped_l3_fail.kdl
new file mode 100644
index 00000000..4b5253fb
--- /dev/null
+++ b/tests/test_cases/input/unicode_escaped_l3_fail.kdl
@@ -0,0 +1 @@
+eno "Surrogates low\u{DFFF}"