diff --git a/tests/source/fn-custom-7.rs b/tests/source/fn-custom-7.rs
new file mode 100644
index 000000000000..6a56c440d331
--- /dev/null
+++ b/tests/source/fn-custom-7.rs
@@ -0,0 +1,19 @@
+// rustfmt-fn_args_layout: Block
+// rustfmt-fn_args_density: Vertical
+// rustfmt-fn_arg_indent: Tabbed
+// rustfmt-fn_brace_style: AlwaysNextLine
+
+// Case with only one variable.
+fn foo(a: u8) -> u8 {
+    bar()
+}
+
+// Case with 2 variables and some pre-comments.
+fn foo(a: u8 /* Comment 1 */, b: u8 /* Comment 2 */) -> u8 {
+    bar()
+}
+
+// Case with 2 variables and some post-comments.
+fn foo(/* Comment 1 */ a: u8, /* Comment 2 */ b: u8) -> u8 {
+    bar()
+}
diff --git a/tests/target/fn-custom-7.rs b/tests/target/fn-custom-7.rs
new file mode 100644
index 000000000000..1c4cbde24b85
--- /dev/null
+++ b/tests/target/fn-custom-7.rs
@@ -0,0 +1,32 @@
+// rustfmt-fn_args_layout: Block
+// rustfmt-fn_args_density: Vertical
+// rustfmt-fn_arg_indent: Tabbed
+// rustfmt-fn_brace_style: AlwaysNextLine
+
+// Case with only one variable.
+fn foo(
+    a: u8
+) -> u8
+{
+    bar()
+}
+
+// Case with 2 variables and some pre-comments.
+fn foo(
+    a: u8, // Comment 1
+    b: u8 // Comment 2
+) -> u8
+{
+    bar()
+}
+
+// Case with 2 variables and some post-comments.
+fn foo(
+    // Comment 1
+    a: u8,
+    // Comment 2
+    b: u8
+) -> u8
+{
+    bar()
+}