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-rw-r--r--tests/ltm.js59
1 files changed, 59 insertions, 0 deletions
diff --git a/tests/ltm.js b/tests/ltm.js
index 8a20f67..00ea0e6 100644
--- a/tests/ltm.js
+++ b/tests/ltm.js
@@ -1137,4 +1137,63 @@ test('__unm, __bnot', function (t) {
"hello",
"Program output is correct"
);
+});
+
+
+test('__len', function (t) {
+ let luaCode = `
+ local mt = {
+ __len = function (a)
+ return "hello"
+ end
+ }
+
+ local t = {}
+
+ -- setmetatable(t, mt)
+
+ return #t
+ `, L;
+
+ t.plan(4);
+
+ t.comment("Running following code: \n" + luaCode);
+
+ // main <hello.lua:0,0> (7 instructions at 0x7f91f0600ac0)
+ // 0+ params, 3 slots, 1 upvalue, 2 locals, 1 constant, 1 function
+ // 1 [1] NEWTABLE 0 0 1
+ // 2 [4] CLOSURE 1 0 ; 0x7f91f0600d10
+ // 3 [4] SETTABLE 0 -1 1 ; "__len" -
+ // 4 [7] NEWTABLE 1 0 0
+ // 5 [11] LEN 2 1 <=== We stop here
+ // 6 [11] RETURN 2 2
+ // 7 [11] RETURN 0 1
+ //
+ // ...
+
+ t.doesNotThrow(function () {
+ L = getState(luaCode);
+ }, "Bytecode parsed without errors");
+
+ L.stack[0].p.code[4].breakpoint = true;
+
+ t.doesNotThrow(function () {
+ ldo.luaD_call(L, 0, -1);
+ }, "First part of the program executed without errors");
+
+ L.ci.pcOff--;
+ L.stack[0].p.code[4].breakpoint = false;
+
+ t.comment("We manually set t's metatable to mt");
+ L.stack[2].metatable = L.stack[1];
+
+ t.doesNotThrow(function () {
+ VM.luaV_execute(L);
+ }, "Second part of the program executed without errors");
+
+ t.strictEqual(
+ L.stack[L.top - 1].value,
+ "hello",
+ "Program output is correct"
+ );
}); \ No newline at end of file