diff --git a/tests/test_cases/expected_kdl/false_prefix_in_bare_id.kdl b/tests/test_cases/expected_kdl/false_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..cd962c4
--- /dev/null
+++ b/tests/test_cases/expected_kdl/false_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+false_id
diff --git a/tests/test_cases/expected_kdl/false_prefix_in_prop_key.kdl b/tests/test_cases/expected_kdl/false_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..2d29843
--- /dev/null
+++ b/tests/test_cases/expected_kdl/false_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node false_id=1
diff --git a/tests/test_cases/expected_kdl/null_prefix_in_bare_id.kdl b/tests/test_cases/expected_kdl/null_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..9e0cf15
--- /dev/null
+++ b/tests/test_cases/expected_kdl/null_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+null_id
diff --git a/tests/test_cases/expected_kdl/null_prefix_in_prop_key.kdl b/tests/test_cases/expected_kdl/null_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..1e1472b
--- /dev/null
+++ b/tests/test_cases/expected_kdl/null_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node null_id=1
diff --git a/tests/test_cases/expected_kdl/true_prefix_in_bare_id.kdl b/tests/test_cases/expected_kdl/true_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..49c9d0d
--- /dev/null
+++ b/tests/test_cases/expected_kdl/true_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+true_id
diff --git a/tests/test_cases/expected_kdl/true_prefix_in_prop_key.kdl b/tests/test_cases/expected_kdl/true_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..2af7a1c
--- /dev/null
+++ b/tests/test_cases/expected_kdl/true_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node true_id=1
diff --git a/tests/test_cases/input/false_prefix_in_bare_id.kdl b/tests/test_cases/input/false_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..cd962c4
--- /dev/null
+++ b/tests/test_cases/input/false_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+false_id
diff --git a/tests/test_cases/input/false_prefix_in_prop_key.kdl b/tests/test_cases/input/false_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..2d29843
--- /dev/null
+++ b/tests/test_cases/input/false_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node false_id=1
diff --git a/tests/test_cases/input/false_prop_key.kdl b/tests/test_cases/input/false_prop_key.kdl
new file mode 100644
index 0000000..a032c0b
--- /dev/null
+++ b/tests/test_cases/input/false_prop_key.kdl
@@ -0,0 +1 @@
+node false=1
diff --git a/tests/test_cases/input/null_prefix_in_bare_id.kdl b/tests/test_cases/input/null_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..9e0cf15
--- /dev/null
+++ b/tests/test_cases/input/null_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+null_id
diff --git a/tests/test_cases/input/null_prefix_in_prop_key.kdl b/tests/test_cases/input/null_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..1e1472b
--- /dev/null
+++ b/tests/test_cases/input/null_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node null_id=1
diff --git a/tests/test_cases/input/null_prop_key.kdl b/tests/test_cases/input/null_prop_key.kdl
new file mode 100644
index 0000000..6896d42
--- /dev/null
+++ b/tests/test_cases/input/null_prop_key.kdl
@@ -0,0 +1 @@
+node null=1
diff --git a/tests/test_cases/input/true_prefix_in_bare_id.kdl b/tests/test_cases/input/true_prefix_in_bare_id.kdl
new file mode 100644
index 0000000..49c9d0d
--- /dev/null
+++ b/tests/test_cases/input/true_prefix_in_bare_id.kdl
@@ -0,0 +1 @@
+true_id
diff --git a/tests/test_cases/input/true_prefix_in_prop_key.kdl b/tests/test_cases/input/true_prefix_in_prop_key.kdl
new file mode 100644
index 0000000..2af7a1c
--- /dev/null
+++ b/tests/test_cases/input/true_prefix_in_prop_key.kdl
@@ -0,0 +1 @@
+node true_id=1
diff --git a/tests/test_cases/input/true_prop_key.kdl b/tests/test_cases/input/true_prop_key.kdl
new file mode 100644
index 0000000..e88c36f
--- /dev/null
+++ b/tests/test_cases/input/true_prop_key.kdl
@@ -0,0 +1 @@
+node true=1