1 files changed, 54 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/starts_ends_with.rs b/src/tools/clippy/tests/ui/starts_ends_with.rs
new file mode 100644
index 000000000..e3335dd2e
--- /dev/null
+++ b/src/tools/clippy/tests/ui/starts_ends_with.rs
@@ -0,0 +1,54 @@
+// run-rustfix
+#![allow(dead_code, unused_must_use)]
+
+fn main() {}
+
+#[allow(clippy::unnecessary_operation)]
+fn starts_with() {
+    "".chars().next() == Some(' ');
+    Some(' ') != "".chars().next();
+
+    // Ensure that suggestion is escaped correctly
+    "".chars().next() == Some('\n');
+    Some('\n') != "".chars().next();
+}
+
+fn chars_cmp_with_unwrap() {
+    let s = String::from("foo");
+    if s.chars().next().unwrap() == 'f' {
+        // s.starts_with('f')
+        // Nothing here
+    }
+    if s.chars().next_back().unwrap() == 'o' {
+        // s.ends_with('o')
+        // Nothing here
+    }
+    if s.chars().last().unwrap() == 'o' {
+        // s.ends_with('o')
+        // Nothing here
+    }
+    if s.chars().next().unwrap() != 'f' {
+        // !s.starts_with('f')
+        // Nothing here
+    }
+    if s.chars().next_back().unwrap() != 'o' {
+        // !s.ends_with('o')
+        // Nothing here
+    }
+    if s.chars().last().unwrap() != '\n' {
+        // !s.ends_with('o')
+        // Nothing here
+    }
+}
+
+#[allow(clippy::unnecessary_operation)]
+fn ends_with() {
+    "".chars().last() == Some(' ');
+    Some(' ') != "".chars().last();
+    "".chars().next_back() == Some(' ');
+    Some(' ') != "".chars().next_back();
+
+    // Ensure that suggestion is escaped correctly
+    "".chars().last() == Some('\n');
+    Some('\n') != "".chars().last();
+}