1 files changed, 80 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/collapsible_else_if.rs b/src/tools/clippy/tests/ui/collapsible_else_if.rs
new file mode 100644
index 00000000000..99c40b8d38e
--- /dev/null
+++ b/src/tools/clippy/tests/ui/collapsible_else_if.rs
@@ -0,0 +1,80 @@
+// run-rustfix
+#![allow(clippy::assertions_on_constants)]
+
+#[rustfmt::skip]
+#[warn(clippy::collapsible_if)]
+fn main() {
+    let x = "hello";
+    let y = "world";
+    // Collapse `else { if .. }` to `else if ..`
+    if x == "hello" {
+        print!("Hello ");
+    } else {
+        if y == "world" {
+            println!("world!")
+        }
+    }
+
+    if x == "hello" {
+        print!("Hello ");
+    } else {
+        if let Some(42) = Some(42) {
+            println!("world!")
+        }
+    }
+
+    if x == "hello" {
+        print!("Hello ");
+    } else {
+        if y == "world" {
+            println!("world")
+        }
+        else {
+            println!("!")
+        }
+    }
+
+    if x == "hello" {
+        print!("Hello ");
+    } else {
+        if let Some(42) = Some(42) {
+            println!("world")
+        }
+        else {
+            println!("!")
+        }
+    }
+
+    if let Some(42) = Some(42) {
+        print!("Hello ");
+    } else {
+        if let Some(42) = Some(42) {
+            println!("world")
+        }
+        else {
+            println!("!")
+        }
+    }
+
+    if let Some(42) = Some(42) {
+        print!("Hello ");
+    } else {
+        if x == "hello" {
+            println!("world")
+        }
+        else {
+            println!("!")
+        }
+    }
+
+    if let Some(42) = Some(42) {
+        print!("Hello ");
+    } else {
+        if let Some(42) = Some(42) {
+            println!("world")
+        }
+        else {
+            println!("!")
+        }
+    }
+}