1 files changed, 67 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/single_char_pattern.rs b/src/tools/clippy/tests/ui/single_char_pattern.rs
new file mode 100644
index 000000000..186202d78
--- /dev/null
+++ b/src/tools/clippy/tests/ui/single_char_pattern.rs
@@ -0,0 +1,67 @@
+// run-rustfix
+
+#![allow(unused_must_use)]
+
+use std::collections::HashSet;
+
+fn main() {
+    let x = "foo";
+    x.split("x");
+    x.split("xx");
+    x.split('x');
+
+    let y = "x";
+    x.split(y);
+    x.split("ß");
+    x.split("ℝ");
+    x.split("💣");
+    // Can't use this lint for unicode code points which don't fit in a char
+    x.split("❤️");
+    x.split_inclusive("x");
+    x.contains("x");
+    x.starts_with("x");
+    x.ends_with("x");
+    x.find("x");
+    x.rfind("x");
+    x.rsplit("x");
+    x.split_terminator("x");
+    x.rsplit_terminator("x");
+    x.splitn(2, "x");
+    x.rsplitn(2, "x");
+    x.split_once("x");
+    x.rsplit_once("x");
+    x.matches("x");
+    x.rmatches("x");
+    x.match_indices("x");
+    x.rmatch_indices("x");
+    x.trim_start_matches("x");
+    x.trim_end_matches("x");
+    x.strip_prefix("x");
+    x.strip_suffix("x");
+    x.replace("x", "y");
+    x.replacen("x", "y", 3);
+    // Make sure we escape characters correctly.
+    x.split("\n");
+    x.split("'");
+    x.split("\'");
+
+    let h = HashSet::<String>::new();
+    h.contains("X"); // should not warn
+
+    x.replace(';', ",").split(","); // issue #2978
+    x.starts_with("\x03"); // issue #2996
+
+    // Issue #3204
+    const S: &str = "#";
+    x.find(S);
+
+    // Raw string
+    x.split(r"a");
+    x.split(r#"a"#);
+    x.split(r###"a"###);
+    x.split(r###"'"###);
+    x.split(r###"#"###);
+    // Must escape backslash in raw strings when converting to char #8060
+    x.split(r#"\"#);
+    x.split(r"\");
+}