Initial public release of Warp.

Repo-Sync-Origin: warpdotdev/warp-internal@12af1d983b

crates/string-offset/src/lib_tests.rs

@@ -0,0 +1,51 @@
+use crate::CharCounter;
+
+#[test]
+fn test_char_counter_sequential() {
+    let mut counter = CharCounter::new("It’s a 🌯!");
+    assert_eq!(counter.char_offset(0), Some(0.into())); // I
+    assert_eq!(counter.char_offset(1), Some(1.into())); // t
+    assert_eq!(counter.char_offset(2), Some(2.into())); // ’ (3 bytes)
+    assert_eq!(counter.char_offset(5), Some(3.into())); // s
+    assert_eq!(counter.char_offset(6), Some(4.into())); // <space>
+    assert_eq!(counter.char_offset(7), Some(5.into())); // a
+    assert_eq!(counter.char_offset(8), Some(6.into())); // <space>
+    assert_eq!(counter.char_offset(9), Some(7.into())); // 🌯 (4 bytes)
+    assert_eq!(counter.char_offset(13), Some(8.into())); // !
+}
+
+#[test]
+fn test_char_counter_out_of_order_fails() {
+    let mut counter = CharCounter::new("words");
+    assert_eq!(counter.char_offset(2), Some(2.into()));
+    // Because the iterator only advances forwards, using an earlier offset is unsupported.
+    assert_eq!(counter.char_offset(1), None);
+}
+
+#[test]
+fn test_char_counter_non_boundary() {
+    let mut counter = CharCounter::new("It’s a 🌯!");
+    // Byte 11 is in the middle of the emoji.
+    assert_eq!(counter.char_offset(11), None);
+}
+
+#[test]
+fn test_char_counter_out_of_bounds() {
+    let mut counter = CharCounter::new("short string");
+    assert_eq!(counter.char_offset(7), Some(7.into()));
+    assert_eq!(counter.char_offset(100), None);
+}
+
+#[test]
+fn test_char_counter_nonsequential() {
+    let mut counter = CharCounter::new("It’s a 🌯!");
+
+    // Skip ahead to the t.
+    assert_eq!(counter.char_offset(1), Some(1.into()));
+
+    // Now, skip past the multi-byte apostrophe to the first space.
+    assert_eq!(counter.char_offset(6), Some(4.into()));
+
+    // Skip ahead to the emoji.
+    assert_eq!(counter.char_offset(9), Some(7.into()));
+}