Add m-esr52 at 52.6.0

1 files changed, 41 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/LexicalEnvironment/unscopables-getters.js b/js/src/tests/ecma_6/LexicalEnvironment/unscopables-getters.js
new file mode 100644
index 000000000..136078798
--- /dev/null
+++ b/js/src/tests/ecma_6/LexicalEnvironment/unscopables-getters.js
@@ -0,0 +1,41 @@
+// @@unscopables checks can call getters.
+
+// The @@unscopables property itself can be a getter.
+let hit1 = 0;
+let x = "global x";
+let env1 = {
+    x: "env1.x",
+    get [Symbol.unscopables]() {
+        hit1++;
+        return {x: true};
+    }
+};
+with (env1)
+    assertEq(x, "global x");
+assertEq(hit1, 1);
+
+// It can throw; the exception is propagated out.
+function Fit() {}
+with ({x: 0, get [Symbol.unscopables]() { throw new Fit; }})
+    assertThrowsInstanceOf(() => x, Fit);
+
+// Individual properties on the @@unscopables object can have getters.
+let hit2 = 0;
+let env2 = {
+    x: "env2.x",
+    [Symbol.unscopables]: {
+        get x() {
+            hit2++;
+            return true;
+        }
+    }
+};
+with (env2)
+    assertEq(x, "global x");
+assertEq(hit2, 1);
+
+// And they can throw.
+with ({x: 0, [Symbol.unscopables]: {get x() { throw new Fit; }}})
+    assertThrowsInstanceOf(() => x, Fit);
+
+reportCompare(0, 0);