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+# 2009 September 15
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+# This file implements tests for foreign keys.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable {!foreignkey||!trigger} {
+  finish_test
+  return
+}
+
+set testprefix fkey3
+
+# Create a table and some data to work with.
+#
+do_test fkey3-1.1 {
+  execsql {
+    PRAGMA foreign_keys=ON;
+    CREATE TABLE t1(x INTEGER PRIMARY KEY);
+    INSERT INTO t1 VALUES(100);
+    INSERT INTO t1 VALUES(101);
+    CREATE TABLE t2(y INTEGER REFERENCES t1 (x));
+    INSERT INTO t2 VALUES(100);
+    INSERT INTO t2 VALUES(101);
+    SELECT 1, x FROM t1;
+    SELECT 2, y FROM t2;
+  }
+} {1 100 1 101 2 100 2 101}
+
+do_test fkey3-1.2 {
+  catchsql {
+    DELETE FROM t1 WHERE x=100;
+  }
+} {1 {foreign key constraint failed}}
+
+do_test fkey3-1.3 {
+  catchsql {
+    DROP TABLE t1;
+  }
+} {1 {foreign key constraint failed}}
+
+do_test fkey3-1.4 {
+  execsql {
+    DROP TABLE t2;
+  }
+} {}
+
+do_test fkey3-1.5 {
+  execsql {
+    DROP TABLE t1;
+  }
+} {}
+
+do_test fkey3-2.1 {
+  execsql {
+    PRAGMA foreign_keys=ON;
+    CREATE TABLE t1(x INTEGER PRIMARY KEY);
+    INSERT INTO t1 VALUES(100);
+    INSERT INTO t1 VALUES(101);
+    CREATE TABLE t2(y INTEGER PRIMARY KEY REFERENCES t1 (x) ON UPDATE SET NULL);
+  }
+  execsql {
+    INSERT INTO t2 VALUES(100);
+    INSERT INTO t2 VALUES(101);
+    SELECT 1, x FROM t1;
+    SELECT 2, y FROM t2;
+  }
+} {1 100 1 101 2 100 2 101}
+
+
+#-------------------------------------------------------------------------
+# The following tests - fkey-3.* - test some edge cases to do with 
+# inserting rows into tables that have foreign keys where the parent
+# table is the same as the child table. Especially cases where the
+# new row being inserted matches itself.
+#
+do_execsql_test 3.1.1 {
+  CREATE TABLE t3(a, b, c, d, 
+    UNIQUE(a, b),
+    FOREIGN KEY(c, d) REFERENCES t3(a, b)
+  );
+  INSERT INTO t3 VALUES(1, 2, 1, 2);
+} {}
+do_catchsql_test 3.1.2 {
+  INSERT INTO t3 VALUES(NULL, 2, 5, 2);
+} {1 {foreign key constraint failed}}
+do_catchsql_test 3.1.3 {
+  INSERT INTO t3 VALUES(NULL, 3, 5, 2);
+} {1 {foreign key constraint failed}}
+
+do_execsql_test 3.2.1 {
+  CREATE TABLE t4(a UNIQUE, b REFERENCES t4(a));
+}
+do_catchsql_test 3.2.2 {
+  INSERT INTO t4 VALUES(NULL, 1);
+} {1 {foreign key constraint failed}}
+
+do_execsql_test 3.3.1 {
+  CREATE TABLE t5(a INTEGER PRIMARY KEY, b REFERENCES t5(a));
+  INSERT INTO t5 VALUES(NULL, 1);
+} {}
+do_catchsql_test 3.3.2 {
+  INSERT INTO t5 VALUES(NULL, 3);
+} {1 {foreign key constraint failed}}
+
+do_execsql_test 3.4.1 {
+  CREATE TABLE t6(a INTEGER PRIMARY KEY, b, c, d,
+    FOREIGN KEY(c, d) REFERENCES t6(a, b)
+  );
+  CREATE UNIQUE INDEX t6i ON t6(b, a);
+}
+do_execsql_test 3.4.2  { INSERT INTO t6 VALUES(NULL, 'a', 1, 'a'); } {}
+do_execsql_test 3.4.3  { INSERT INTO t6 VALUES(2, 'a', 2, 'a');    } {}
+do_execsql_test 3.4.4  { INSERT INTO t6 VALUES(NULL, 'a', 1, 'a'); } {}
+do_execsql_test 3.4.5  { INSERT INTO t6 VALUES(5, 'a', 2, 'a'); } {}
+do_catchsql_test 3.4.6 { 
+  INSERT INTO t6 VALUES(NULL, 'a', 65, 'a');    
+} {1 {foreign key constraint failed}}
+
+do_execsql_test 3.4.7 {
+  INSERT INTO t6 VALUES(100, 'one', 100, 'one');
+  DELETE FROM t6 WHERE a = 100;
+}
+do_execsql_test 3.4.8 {
+  INSERT INTO t6 VALUES(100, 'one', 100, 'one');
+  UPDATE t6 SET c = 1, d = 'a' WHERE a = 100;
+  DELETE FROM t6 WHERE a = 100;
+}
+
+do_execsql_test 3.5.1 {
+  CREATE TABLE t7(a, b, c, d INTEGER PRIMARY KEY,
+    FOREIGN KEY(c, d) REFERENCES t7(a, b)
+  );
+  CREATE UNIQUE INDEX t7i ON t7(a, b);
+}
+do_execsql_test 3.5.2  { INSERT INTO t7 VALUES('x', 1, 'x', NULL) } {}
+do_execsql_test 3.5.3  { INSERT INTO t7 VALUES('x', 2, 'x', 2) } {}
+do_catchsql_test 3.5.4  { 
+  INSERT INTO t7 VALUES('x', 450, 'x', NULL);
+} {1 {foreign key constraint failed}}
+do_catchsql_test 3.5.5  { 
+  INSERT INTO t7 VALUES('x', 450, 'x', 451);
+} {1 {foreign key constraint failed}}
+
+
+do_execsql_test 3.6.1 {
+  CREATE TABLE t8(a, b, c, d, e, FOREIGN KEY(c, d) REFERENCES t8(a, b));
+  CREATE UNIQUE INDEX t8i1 ON t8(a, b);
+  CREATE UNIQUE INDEX t8i2 ON t8(c);
+  INSERT INTO t8 VALUES(1, 1, 1, 1, 1);
+}
+do_catchsql_test 3.6.2 { 
+  UPDATE t8 SET d = 2; 
+} {1 {foreign key constraint failed}}
+do_execsql_test 3.6.3 { UPDATE t8 SET d = 1; }
+do_execsql_test 3.6.4 { UPDATE t8 SET e = 2; }
+
+do_catchsql_test 3.6.5 {
+  CREATE TABLE TestTable (
+    id INTEGER PRIMARY KEY,
+    name text,
+    source_id integer not null,
+    parent_id integer,
+
+    foreign key(source_id, parent_id) references TestTable(source_id, id)
+  );
+  CREATE UNIQUE INDEX testindex on TestTable(source_id, id);
+  PRAGMA foreign_keys=1;
+  INSERT INTO TestTable VALUES (1, 'parent', 1, null);
+  INSERT INTO TestTable VALUES (2, 'child', 1, 1);
+  UPDATE TestTable SET parent_id=1000 where id=2;
+} {1 {foreign key constraint failed}}
+
+finish_test