1 files changed, 39 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/target/fn_args_layout-vertical.rs b/src/tools/rustfmt/tests/target/fn_args_layout-vertical.rs
new file mode 100644
index 000000000..da0ac981d
--- /dev/null
+++ b/src/tools/rustfmt/tests/target/fn_args_layout-vertical.rs
@@ -0,0 +1,39 @@
+// rustfmt-fn_args_layout: Vertical
+
+// Empty list should stay on one line.
+fn do_bar() -> u8 {
+    bar()
+}
+
+// A single argument should stay on the same line.
+fn do_bar(a: u8) -> u8 {
+    bar()
+}
+
+// Multiple arguments should each get their own line.
+fn do_bar(
+    a: u8,
+    mut b: u8,
+    c: &u8,
+    d: &mut u8,
+    closure: &Fn(i32) -> i32,
+) -> i32 {
+    // This feature should not affect closures.
+    let bar = |x: i32, y: i32| -> i32 { x + y };
+    bar(a, b)
+}
+
+// If the first argument doesn't fit on the same line with the function name,
+// the whole list should probably be pushed to the next line with hanging
+// indent. That's not what happens though, so check current behaviour instead.
+// In any case, it should maintain single argument per line.
+fn do_this_that_and_the_other_thing(
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: u8,
+    b: u8,
+    c: u8,
+    d: u8,
+) {
+    this();
+    that();
+    the_other_thing();
+}