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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/lexical-environment/redeclaring-global-properties.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/lexical-environment/redeclaring-global-properties.js | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/redeclaring-global-properties.js b/js/src/tests/non262/lexical-environment/redeclaring-global-properties.js new file mode 100644 index 0000000000..7fb2f82db1 --- /dev/null +++ b/js/src/tests/non262/lexical-environment/redeclaring-global-properties.js @@ -0,0 +1,64 @@ +// |reftest| skip-if(!xulRuntime.shell) -- needs evaluate +// Any copyright is dedicated to the Public Domain. +// http://creativecommons.org/licenses/publicdomain/ + +// Attempting to lexically redefine a var is a syntax error. +evaluate("var a;"); +assertThrowsInstanceOf(() => evaluate("let a;"), SyntaxError); + +// Attempting to lexically redefine a configurable global property that's not a +// var is okay. +this.b = 42; +assertEq(b, 42); +evaluate("let b = 17;"); +assertEq(b, 17); + +// Attempting to lexically redefine a configurable global property that wasn't +// a var initially but was later declared as one, isn't okay. +this.c = 8675309; +assertEq(c, 8675309); +evaluate("var c;"); +assertThrowsInstanceOf(() => evaluate("let c;"), SyntaxError); + +// Attempting to lexically redefine a var added by eval code isn't okay. +assertEq(typeof d, "undefined"); +eval("var d = 33;"); +assertEq(d, 33); +assertThrowsInstanceOf(() => evaluate("let d;"), SyntaxError); + +// Attempting to lexically redefine a var added by eval code, then deleted *as a +// name*, is okay. (The |var| will add the name to the global environment +// record's [[VarNames]], but deletion will go through the global environment +// record's DeleteBinding and so will remove it.) +assertEq(typeof e, "undefined"); +eval("var e = 'ohia';"); +assertEq(e, "ohia"); +delete e; +assertEq(this.hasOwnProperty("e"), false); +evaluate("let e = 3.141592654;"); +assertEq(e, 3.141592654); + +// Attempting to lexically redefine a var added by eval code, then deleted *as a +// property*, isn't okay. (Deletion by property doesn't go through the global +// environment record's DeleteBinding algorithm, and so the name isn't removed +// from [[VarNames]].) And it remains non-okay even if the var is subsequently +// deleted as a name, because if the property doesn't exist, it's not removed +// from [[VarNames]]. But if we add the global property again and then delete +// by name, it *will* get removed from [[VarNames]]. +assertEq(typeof f, "undefined"); +eval("var f = 8675309;"); +assertEq(f, 8675309); +delete this.f; +assertEq(this.hasOwnProperty("f"), false); +assertThrowsInstanceOf(() => evaluate("let f;"), SyntaxError); +delete f; +assertThrowsInstanceOf(() => evaluate("let f;"), SyntaxError); +this.f = 999; +assertThrowsInstanceOf(() => evaluate("let f;"), SyntaxError); +delete f; +evaluate("let f;"); + +if (typeof reportCompare === "function") + reportCompare(true, true); + +print("Tests complete"); |