1 files changed, 93 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/ref-types/tables-api.js b/js/src/jit-test/tests/wasm/ref-types/tables-api.js
new file mode 100644
index 0000000000..a2ae3c45f0
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/ref-types/tables-api.js
@@ -0,0 +1,93 @@
+// Test changes to the WebAssembly.Table API by reference-types
+
+function assertTableFilled(table, length, element) {
+  assertEq(table.length, length);
+  for (let i = 0; i < length; i++) {
+    assertEq(table.get(i), element);
+  }
+}
+
+const tableLength = 10;
+
+// Test table constructor can accept a default value to fill elements to
+for (let value of WasmExternrefValues) {
+  let table = new WebAssembly.Table({'element': 'externref', initial: tableLength}, value);
+  assertTableFilled(table, tableLength, value);
+}
+for (let value of WasmFuncrefValues) {
+  let table = new WebAssembly.Table({'element': 'anyfunc', initial: tableLength}, value);
+  assertTableFilled(table, tableLength, value);
+}
+
+// Test not specifying default value in constructor yields 'undefined' for externref
+{
+  let table = new WebAssembly.Table({'element': 'externref', initial: tableLength});
+  assertTableFilled(table, tableLength, undefined);
+}
+
+// Test not specifying default value in constructor yields 'null' for funcref
+{
+  let table = new WebAssembly.Table({'element': 'anyfunc', initial: tableLength});
+  assertTableFilled(table, tableLength, null);
+}
+
+// Test omitting the value in table set defaults to undefined for externref and
+// null for funcref.
+{
+    let t = new WebAssembly.Table({element:"externref", initial: 1});
+    // Clear out initial value
+    t.set(0, '');
+    // Set with an omitted value
+    t.set(0);
+    // Assert the omitted value is undefined
+    assertEq(t.get(0), undefined);
+}
+{
+    let t = new WebAssembly.Table({element:"anyfunc", initial: 1});
+    // Clear out initial value
+    t.set(0, WasmFuncrefValues[0]);
+    // Set with an omitted value
+    t.set(0);
+    // Assert the omitted value is null
+    assertEq(t.get(0), null);
+}
+
+// Test table grow. There is an optional fill argument that defaults to
+// undefined with externref, and null with funcref.
+{
+    let t = new WebAssembly.Table({element:"externref", initial:0});
+    t.grow(1);
+    assertEq(t.get(t.length-1), undefined);
+    let prev = undefined;
+    for (let v of WasmExternrefValues) {
+        t.grow(2, v);
+        assertEq(t.get(t.length-3), prev);
+        assertEq(t.get(t.length-2), v);
+
+        assertEq(t.get(t.length-1), v);
+        prev = v;
+    }
+}
+
+{
+    let t = new WebAssembly.Table({element:"anyfunc", initial:0});
+    t.grow(1);
+    assertEq(t.get(t.length-1), null);
+    let prev = null;
+    for (let v of WasmFuncrefValues) {
+        t.grow(2, v);
+        assertEq(t.get(t.length-3), prev);
+        assertEq(t.get(t.length-2), v);
+
+        assertEq(t.get(t.length-1), v);
+        prev = v;
+    }
+}
+
+// If growing by zero elements there are no spurious writes
+{
+    let t = new WebAssembly.Table({element:"externref", initial:1});
+    t.set(0, 1337);
+    t.grow(0, 1789);
+    assertEq(t.get(0), 1337);
+}