1 files changed, 41 insertions, 0 deletions
diff --git a/op_crates/web/text_encoding_test.js b/op_crates/web/text_encoding_test.js
index f741fe409..06537df24 100644
--- a/op_crates/web/text_encoding_test.js
+++ b/op_crates/web/text_encoding_test.js
@@ -131,6 +131,44 @@ function textDecoderErrorEncoding() {
   assert(didThrow);
 }
 
+function textDecoderHandlesUndefined() {
+  const fixture = undefined;
+  const decoder = new TextDecoder();
+  assert(decoder.decode(fixture) === "");
+}
+
+function textDecoderThrowsOnEmpty() {
+  const fixture = "";
+  const decoder = new TextDecoder();
+  let didThrow = false;
+  try {
+    decoder.decode(fixture);
+  } catch (e) {
+    didThrow = true;
+    assert(
+      e.message ===
+        "Provided input is not of type ArrayBuffer or ArrayBufferView",
+    );
+  }
+  assert(didThrow);
+}
+
+function textDecoderThrowsOnNull() {
+  const fixture = null;
+  const decoder = new TextDecoder();
+  let didThrow = false;
+  try {
+    decoder.decode(fixture);
+  } catch (e) {
+    didThrow = true;
+    assert(
+      e.message ===
+        "Provided input is not of type ArrayBuffer or ArrayBufferView",
+    );
+  }
+  assert(didThrow);
+}
+
 function textEncoder() {
   const fixture = "𝓽𝓮𝔁𝓽";
   const encoder = new TextEncoder();
@@ -231,6 +269,9 @@ function main() {
   textDecoderNotBOM();
   textDecoderASCII();
   textDecoderErrorEncoding();
+  textDecoderHandlesUndefined();
+  textDecoderThrowsOnEmpty();
+  textDecoderThrowsOnNull();
   textEncoder();
   textEncodeInto();
   textEncodeInto2();