1 files changed, 44 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/case_sensitive_file_extension_comparisons.rs b/src/tools/clippy/tests/ui/case_sensitive_file_extension_comparisons.rs
new file mode 100644
index 000000000..0d65071af
--- /dev/null
+++ b/src/tools/clippy/tests/ui/case_sensitive_file_extension_comparisons.rs
@@ -0,0 +1,44 @@
+#![warn(clippy::case_sensitive_file_extension_comparisons)]
+
+use std::string::String;
+
+struct TestStruct;
+
+impl TestStruct {
+    fn ends_with(self, arg: &str) {}
+}
+
+fn is_rust_file(filename: &str) -> bool {
+    filename.ends_with(".rs")
+}
+
+fn main() {
+    // std::string::String and &str should trigger the lint failure with .ext12
+    let _ = String::from("").ends_with(".ext12");
+    let _ = "str".ends_with(".ext12");
+
+    // The test struct should not trigger the lint failure with .ext12
+    TestStruct {}.ends_with(".ext12");
+
+    // std::string::String and &str should trigger the lint failure with .EXT12
+    let _ = String::from("").ends_with(".EXT12");
+    let _ = "str".ends_with(".EXT12");
+
+    // The test struct should not trigger the lint failure with .EXT12
+    TestStruct {}.ends_with(".EXT12");
+
+    // Should not trigger the lint failure with .eXT12
+    let _ = String::from("").ends_with(".eXT12");
+    let _ = "str".ends_with(".eXT12");
+    TestStruct {}.ends_with(".eXT12");
+
+    // Should not trigger the lint failure with .EXT123 (too long)
+    let _ = String::from("").ends_with(".EXT123");
+    let _ = "str".ends_with(".EXT123");
+    TestStruct {}.ends_with(".EXT123");
+
+    // Shouldn't fail if it doesn't start with a dot
+    let _ = String::from("").ends_with("a.ext");
+    let _ = "str".ends_with("a.extA");
+    TestStruct {}.ends_with("a.ext");
+}