dont validate fkey on parent add tests

correct msitake and add null test issue

add fkey test

core/schema.rs

@@ -968,8 +968,6 @@ impl Schema {
                     None
                 } else {
                     find_parent_unique(&parent_cols)
-                        .ok_or_else(|| fk_mismatch_err(&child.name, &parent_tbl.name))?
-                        .into()
                 };
                 fk.validate()?;
                 out.push(ResolvedFkRef {

testing/foreign_keys.test

@@ -1207,3 +1207,34 @@ do_execsql_test_in_memory_any_error fk-update-parent-multi-col-pk-2 {
   INSERT INTO child VALUES(1, 2);
   UPDATE parent SET b = 3 WHERE a = 1 AND b = 2;
 }
+
+# https://github.com/tursodatabase/turso/issues/3965
+do_execsql_test_on_specific_db {:memory:} fk-no-val-on-parent {
+    PRAGMA foreign_keys=ON;
+    CREATE TABLE t1(
+    a INT,
+    b INT
+  );
+  CREATE TABLE t2(
+    x INT,
+    y INT,
+    FOREIGN KEY (x, y) REFERENCES t1(a, b)
+  );
+  INSERT INTO t1(a, b) VALUES (5, 10);
+  SELECT * FROM t1;
+ } {5|10}
+
+ do_execsql_test_in_memory_any_error fk-val-on-parent {
+    PRAGMA foreign_keys=ON;
+    CREATE TABLE t1(
+    a INT,
+    b INT
+  );
+  CREATE TABLE t2(
+    x INT,
+    y INT,
+    FOREIGN KEY (x, y) REFERENCES t1(a, b)
+  );
+  INSERT INTO t2(a, b) VALUES (5, 10);
+  SELECT * FROM t2;
+ }

testing/null.test

@@ -27,6 +27,7 @@ do_execsql_test sel-false {
 	select false;
 } {0}
 
+# https://github.com/tursodatabase/turso/issues/3966
 do_execsql_test_on_specific_db {:memory:} not-null-just-cuz-unique {
     create table t (a int, x int unique);
     insert into t(a) values(1);