Regression test for DELETE without WHERE confirming #856 is fixed (#2190)

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: mathiasrw <[email protected]>
Co-authored-by: Mathias Wulff <[email protected]>

Author: Copilot

test/test856.js

@@ -0,0 +1,41 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+}
+
+var test = '856'; // insert test file number
+
+describe('Test ' + test + ' - DELETE without WHERE clause', function () {
+	before(function () {
+		alasql('DROP TABLE IF EXISTS test856table');
+		alasql('CREATE TABLE test856table (id INT, name STRING)');
+	});
+
+	after(function () {
+		alasql('DROP TABLE test856table');
+	});
+
+	it('1. DELETE without WHERE should delete all rows', function () {
+		alasql('INSERT INTO test856table VALUES (1, "Alice"), (2, "Bob"), (3, "Charlie")');
+		var res = alasql('SELECT * FROM test856table');
+		assert.equal(res.length, 3);
+
+		var deletedCount = alasql('DELETE FROM test856table');
+		assert.equal(deletedCount, 3, 'Should delete 3 rows');
+
+		var res2 = alasql('SELECT * FROM test856table');
+		assert.equal(res2.length, 0, 'Table should be empty after DELETE');
+	});
+
+	it('2. DELETE without WHERE on fresh data', function () {
+		alasql('INSERT INTO test856table VALUES (1, "Test1"), (2, "Test2")');
+		var res = alasql('SELECT * FROM test856table');
+		assert.equal(res.length, 2);
+
+		var deletedCount = alasql('DELETE FROM test856table');
+		assert.equal(deletedCount, 2, 'Should delete 2 rows');
+
+		var res2 = alasql('SELECT * FROM test856table');
+		assert.equal(res2.length, 0, 'Table should be empty after DELETE');
+	});
+});