3 files changed, 67 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/source/configs/chain_width/always.rs b/src/tools/rustfmt/tests/source/configs/chain_width/always.rs
new file mode 100644
index 000000000..2d16d66ae
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/configs/chain_width/always.rs
@@ -0,0 +1,23 @@
+// rustfmt-chain_width: 1
+// setting an unachievable chain_width to always get chains
+// on separate lines
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should be left alone
+    test.blorp();
+
+    // should be wrapped
+    test.blorp().blorp();
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+}
diff --git a/src/tools/rustfmt/tests/source/configs/chain_width/small.rs b/src/tools/rustfmt/tests/source/configs/chain_width/small.rs
new file mode 100644
index 000000000..26f935453
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/configs/chain_width/small.rs
@@ -0,0 +1,23 @@
+// rustfmt-chain_width: 40
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+
+    // should be wrapped
+    test.blorp().blorp().blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp().blorp().blorp();
+}
diff --git a/src/tools/rustfmt/tests/source/configs/chain_width/tiny.rs b/src/tools/rustfmt/tests/source/configs/chain_width/tiny.rs
new file mode 100644
index 000000000..fffc81dd5
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/configs/chain_width/tiny.rs
@@ -0,0 +1,21 @@
+// rustfmt-chain_width: 20
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+
+    // should be wrapped
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+}