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 * @copyright 2014 The Open University
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 * @copyright 2014 The Open University
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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class datalib_update_with_unique_index_test extends \advanced_testcase {
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class datalib_update_with_unique_index_test extends \advanced_testcase {
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    public function test_decompose_update_into_safe_changes_identity() {
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    public function test_decompose_update_into_safe_changes_identity(): void {
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        $this->assertEquals(array(), decompose_update_into_safe_changes(
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        $this->assertEquals(array(), decompose_update_into_safe_changes(
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                array(1 => 1, 2 => 2), -1));
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                array(1 => 1, 2 => 2), -1));
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    }
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    }
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    public function test_decompose_update_into_safe_changes_no_overlap() {
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    public function test_decompose_update_into_safe_changes_no_overlap(): void {
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        $this->assertEquals(array(array(1, 3), array(2, 4)), decompose_update_into_safe_changes(
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        $this->assertEquals(array(array(1, 3), array(2, 4)), decompose_update_into_safe_changes(
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                array(1 => 3, 2 => 4), -1));
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                array(1 => 3, 2 => 4), -1));
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    }
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    }
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    public function test_decompose_update_into_safe_changes_shift() {
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    public function test_decompose_update_into_safe_changes_shift(): void {
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        $this->assertSame(array(array(3, 4), array(2, 3), array(1, 2)), decompose_update_into_safe_changes(
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        $this->assertSame(array(array(3, 4), array(2, 3), array(1, 2)), decompose_update_into_safe_changes(
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                array(1 => 2, 2 => 3, 3 => 4), -1));
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                array(1 => 2, 2 => 3, 3 => 4), -1));
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    }
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    }
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    public function test_decompose_decompose_update_into_safe_changes_simple_swap() {
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    public function test_decompose_decompose_update_into_safe_changes_simple_swap(): void {
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        $this->assertEquals(array(array(1, -1), array(2, 1), array(-1, 2)), decompose_update_into_safe_changes(
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        $this->assertEquals(array(array(1, -1), array(2, 1), array(-1, 2)), decompose_update_into_safe_changes(
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                array(1 => 2, 2 => 1), -1));
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                array(1 => 2, 2 => 1), -1));
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    }
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    }
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    public function test_decompose_update_into_safe_changes_cycle() {
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    public function test_decompose_update_into_safe_changes_cycle(): void {
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        $this->assertEquals(array(array(1, -2), array(3, 1), array(2, 3), array(-2, 2)),
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        $this->assertEquals(array(array(1, -2), array(3, 1), array(2, 3), array(-2, 2)),
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                decompose_update_into_safe_changes(
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                decompose_update_into_safe_changes(
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                array(1 => 2, 2 => 3 , 3 => 1), -2));
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                array(1 => 2, 2 => 3 , 3 => 1), -2));
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    }
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    }
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    public function test_decompose_update_into_safe_changes_complex() {
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    public function test_decompose_update_into_safe_changes_complex(): void {
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        $this->assertEquals(array(array(9, 10), array(8, 9),
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        $this->assertEquals(array(array(9, 10), array(8, 9),
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                array(1, -1), array(5, 1), array(7, 5), array(-1, 7),
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                array(1, -1), array(5, 1), array(7, 5), array(-1, 7),
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                array(4, -1), array(6, 4), array(-1, 6)), decompose_update_into_safe_changes(
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                array(4, -1), array(6, 4), array(-1, 6)), decompose_update_into_safe_changes(
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                array(1 => 7, 2 => 2, 3 => 3, 4 => 6, 5 => 1, 6 => 4, 7 => 5, 8 => 9, 9 => 10), -1));
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                array(1 => 7, 2 => 2, 3 => 3, 4 => 6, 5 => 1, 6 => 4, 7 => 5, 8 => 9, 9 => 10), -1));
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    }
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    }
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    public function test_decompose_update_into_safe_changes_unused_value_id_used() {
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    public function test_decompose_update_into_safe_changes_unused_value_id_used(): void {
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        try {
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        try {
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            decompose_update_into_safe_changes(array(1 => 1), 1);
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            decompose_update_into_safe_changes(array(1 => 1), 1);
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            $this->fail('Expected exception was not thrown');
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            $this->fail('Expected exception was not thrown');
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        } catch (\coding_exception $e) {
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        } catch (\coding_exception $e) {
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            $this->assertEquals('Supposedly unused value 1 is actually used!', $e->a);
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            $this->assertEquals('Supposedly unused value 1 is actually used!', $e->a);
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        }
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        }
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    }
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    }
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    public function test_decompose_update_into_safe_changes_string_values() {
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    public function test_decompose_update_into_safe_changes_string_values(): void {
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        // Sometimes this happens when data has been loaded from the database.
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        // Sometimes this happens when data has been loaded from the database.
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        $this->assertEquals(array(array(1, -1), array(2, 1),
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        $this->assertEquals(array(array(1, -1), array(2, 1),
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                    array(3, 2), array(4, 3), array(-1, 4)),
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                    array(3, 2), array(4, 3), array(-1, 4)),