lua: os stub (time/clock/date/difftime/getenv/...) +8 tests

lib/lua/test.sh

@@ -858,6 +858,24 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 1441)
 (eval "(lua-eval-ast \"if io.open(\\\"x\\\") == nil then return 1 else return 0 end\")")
 
+;; ── Phase 6: os stub ──────────────────────────────────────────
+(epoch 1500)
+(eval "(lua-eval-ast \"return type(os.time())\")")
+(epoch 1501)
+(eval "(lua-eval-ast \"local t1 = os.time() local t2 = os.time() return t2 > t1\")")
+(epoch 1502)
+(eval "(lua-eval-ast \"return os.difftime(100, 60)\")")
+(epoch 1503)
+(eval "(lua-eval-ast \"return type(os.clock())\")")
+(epoch 1504)
+(eval "(lua-eval-ast \"return type(os.date())\")")
+(epoch 1505)
+(eval "(lua-eval-ast \"local d = os.date(\\\"*t\\\") return d.year\")")
+(epoch 1506)
+(eval "(lua-eval-ast \"if os.getenv(\\\"HOME\\\") == nil then return 1 else return 0 end\")")
+(epoch 1507)
+(eval "(lua-eval-ast \"return type(os.tmpname())\")")
+
 EPOCHS
 
 OUTPUT=$(timeout 60 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
@@ -1289,6 +1307,16 @@ check 1431 "tonumber(\"abc\") → nil"        '1'
 check 1440 "io.read() → nil"                '1'
 check 1441 "io.open(x) → nil"               '1'
 
+# ── Phase 6: os stub ──────────────────────────────────────────
+check 1500 "os.time → number"               '"number"'
+check 1501 "os.time monotonic"              'true'
+check 1502 "os.difftime"                    '40'
+check 1503 "os.clock → number"              '"number"'
+check 1504 "os.date() default"              '"string"'
+check 1505 "os.date(*t).year"               '1970'
+check 1506 "os.getenv → nil"                '1'
+check 1507 "os.tmpname → string"            '"string"'
+
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "ok $PASS/$TOTAL Lua-on-SX tests passed"