1 files changed, 74 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/string-indexof-constant-string-length-two.js b/js/src/jit-test/tests/warp/string-indexof-constant-string-length-two.js
new file mode 100644
index 0000000000..7659aee53e
--- /dev/null
+++ b/js/src/jit-test/tests/warp/string-indexof-constant-string-length-two.js
@@ -0,0 +1,74 @@
+// Test case to cover String.prototype.{indexOf,lastIndexOf,includes} with a constant string of length two.
+
+const strings = [
+  // Empty string.
+  "",
+
+  // Latin-1 string.
+  "abcdefgh",
+
+  // Two-byte string.
+  "\u{101}\u{102}\u{103}\u{104}\u{105}\u{106}\u{107}\u{108}",
+].flatMap(x => [
+  x,
+
+  // Add leading characters.
+  "!".repeat(10) + x,
+
+  // Add trailing characters.
+  x + "!".repeat(10),
+]).flatMap(x => [
+  x,
+
+  // To cover the case when the string is two-byte, but has only Latin-1 contents.
+  newString(x, {twoByte: true}),
+]);
+
+const searchStrings = [
+  // Latin-1 search strings:
+  // - at the start of the input string
+  "ab",
+  // - in the middle of the input string
+  "de",
+  // - at the end of the input string
+  "gh",
+  // - not in the input string
+  "zz",
+
+  // Two-byte search strings:
+  // - at the start of the input string
+  "\u{101}\u{102}",
+  // - in the middle of the input string
+  "\u{104}\u{105}",
+  // - at the end of the input string
+  "\u{107}\u{108}",
+  // - not in the input string
+  "\u{1000}\u{1001}",
+];
+
+const stringFunctions = [
+  "indexOf",
+  "lastIndexOf",
+  "includes",
+];
+
+for (let stringFunction of stringFunctions) {
+  for (let searchString of searchStrings) {
+    let fn = Function("strings", `
+      const expected = strings.map(x => {
+        // Prevent Warp compilation when computing the expected results.
+        with ({}) ;
+        return x.${stringFunction}("${searchString}");
+      });
+
+      for (let i = 0; i < 500; ++i) {
+        let idx = i % strings.length;
+        let str = strings[idx];
+
+        let actual = str.${stringFunction}("${searchString}");
+        assertEq(actual, expected[idx]);
+      }
+    `);
+    fn(strings);
+  }
+}