add str traits for split, between, unquote; consolidate tests

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/string/tests.rs

@@ -0,0 +1,70 @@
+#![cfg(test)]
+
+#[test]
+fn common_prefix() {
+	let input = ["conduwuit", "conduit", "construct"];
+	let output = super::common_prefix(&input);
+	assert_eq!(output, "con");
+}
+
+#[test]
+fn common_prefix_empty() {
+	let input = ["abcdefg", "hijklmn", "opqrstu"];
+	let output = super::common_prefix(&input);
+	assert_eq!(output, "");
+}
+
+#[test]
+fn common_prefix_none() {
+	let input = [];
+	let output = super::common_prefix(&input);
+	assert_eq!(output, "");
+}
+
+#[test]
+fn camel_to_snake_case_0() {
+	let res = super::camel_to_snake_string("CamelToSnakeCase");
+	assert_eq!(res, "camel_to_snake_case");
+}
+
+#[test]
+fn camel_to_snake_case_1() {
+	let res = super::camel_to_snake_string("CAmelTOSnakeCase");
+	assert_eq!(res, "camel_tosnake_case");
+}
+
+#[test]
+fn unquote() {
+	use super::Unquote;
+
+	assert_eq!("\"foo\"".unquote(), Some("foo"));
+	assert_eq!("\"foo".unquote(), None);
+	assert_eq!("foo".unquote(), None);
+}
+
+#[test]
+fn unquote_infallible() {
+	use super::Unquote;
+
+	assert_eq!("\"foo\"".unquote_infallible(), "foo");
+	assert_eq!("\"foo".unquote_infallible(), "\"foo");
+	assert_eq!("foo".unquote_infallible(), "foo");
+}
+
+#[test]
+fn between() {
+	use super::Between;
+
+	assert_eq!("\"foo\"".between(("\"", "\"")), Some("foo"));
+	assert_eq!("\"foo".between(("\"", "\"")), None);
+	assert_eq!("foo".between(("\"", "\"")), None);
+}
+
+#[test]
+fn between_infallible() {
+	use super::Between;
+
+	assert_eq!("\"foo\"".between_infallible(("\"", "\"")), "foo");
+	assert_eq!("\"foo".between_infallible(("\"", "\"")), "\"foo");
+	assert_eq!("foo".between_infallible(("\"", "\"")), "foo");
+}