test: port the module-reset adjacency pin to ww

test/xmod/modreset_test.ww

@@ -0,0 +1,82 @@
+package modreset_test;
+
+// BUG-A (#9) regression pin: the lexer must not leave a stale
+// TK_MODPATH pending past a `//ww:module-reset`. Port of the retired
+// native carrier test/wcc/989_modresetadj_run.c; every assertion
+// preserved.
+//
+// The composed sep-unit puts `//ww:module e` and `//ww:module-reset`
+// in ONE skipws run with no real token between (the shape the sep
+// driver emits for an empty/export-less inlined module body); pre-fix
+// the stale modpath=e survived the reset and `package main` was
+// rejected against import path "e". The unit is fed STRAIGHT to
+// w6c/w6c_ww: the natural empty-module dir route trips the separate
+// #11 wwi_emit bug first, and the driver cannot locate the phantom
+// package e (which is also why the corpus cannot host it -- the
+// blanket data byte-id gate drives every non-error fixture through
+// `ww build`).
+//
+// Legs: (1) w6c accepts the adjacency (pre-fix REJECT -- the teeth);
+// (2) w6c_ww accepts it (rule-10 twin); (3a) the two .s are
+// byte-identical; (3b) assemble+link+run to exit 42 (the emitted code
+// is valid, not just parse-clean).
+
+import os;
+import os.exec;
+import strings;
+import testenv;
+import time;
+
+fn fail(why: str) void = {
+	let m: str = strings.concat("modreset FAIL: ", why, "\n");
+	os.write(2, m.ptr, m.len: u64);
+	assert(false);
+};
+
+fn tmo() time.duration = {
+	return (240i64 * (time.second: i64)): time.duration;
+};
+
+// -1 encodes an abnormal (non-EXIT) termination, never a valid code.
+fn runcode(dir: str, name: str, argv: []str) i32 = {
+	let co: testenv.commandout;
+	testenv.runcommand(dir, dir, name, argv, tmo(), &co);
+	if (co.termination != exec.termination.EXIT) { return -1; };
+	return co.code;
+};
+
+@test fn modresetadj() void = {
+	let td: str = testenv.fresh();
+	let unit: str = strings.concat(td, "/mradj.unit.ww");
+	testenv.writefile(unit, strings.concat(
+		"//ww:module e\n",
+		"//ww:module-reset\n",
+		"package main;\n",
+		"import e;\n",
+		"export fn main() i32 = { return 42; };\n"));
+	let scs: str = strings.concat(td, "/cs.s");
+	let sww: str = strings.concat(td, "/ww.s");
+	let cav: []str = [testenv.driver("w6c"), "-c", "-o", scs, unit];
+	if (runcode(td, "w6c", cav) != 0) {
+		fail("w6c rejected the adjacency unit (BUG-A stale modpath)");
+	};
+	let wav: []str = [testenv.driver("w6c_ww"), "-c", "-o", sww, unit];
+	if (runcode(td, "w6c_ww", wav) != 0) {
+		fail("w6c_ww rejected the adjacency unit (BUG-A)");
+	};
+	if (!testenv.same(testenv.readfile(scs), testenv.readfile(sww))) {
+		fail("w6c vs w6c_ww .s differ (rule 10)");
+	};
+	let obj: str = strings.concat(td, "/mradj.o");
+	let aav: []str = [testenv.driver("w6a"), "-o", obj, scs];
+	if (runcode(td, "w6a", aav) != 0) { fail("w6a errored"); };
+	let prog: str = strings.concat(td, "/mradj.bin");
+	let lav: []str = [testenv.driver("w6l"), "-o", prog, obj,
+		strings.concat(testenv.repo(), "/out/lib/libwwrt.a")];
+	if (runcode(td, "w6l", lav) != 0) { fail("w6l errored"); };
+	let rav: []str = [prog];
+	if (runcode(td, "run", rav) != 42) {
+		fail("program exit != 42 (main did not run to its return)");
+	};
+	testenv.clean(td);
+};