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Compound tax calculation test 

There is either an error in the calculation for compound taxes, or
there is something wrong with my understanding of how compound taxes
should work - I’m definitely not discounting the later.

Given a price of $9.99 exclusive of tax, applying a 10% tax will give
9.99 + 0.999 = 10.989. Then applying a compound tax of 2% should give
10.989 + 0.2198 = 11.2088.

The result of the WC_Tax::calc_tax on the 2% compound tax is 0.1998
which seems to be in error.

Likewise for prices exclusive of tax.

Note: rounding to 4 decimal places on all calculations
This commit is contained in:
Paul Kilmurray 2015-02-23 14:40:10 +08:00
parent b25e51dbe6
commit cb12623fa7
1 changed files with 56 additions and 0 deletions
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56
tests/unit-tests/tax.php
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@ -208,6 +208,62 @@ class WC_Tests_Tax extends WC_Unit_Test_Case {
WC_Tax::_delete_tax_rate( $tax_rate_id );
}
/**
* Test compound tax amounts
*/
public function test_calc_compound_tax() {
global $wpdb;
$wpdb->query( "DELETE FROM {$wpdb->prefix}woocommerce_tax_rates" );
$wpdb->query( "DELETE FROM {$wpdb->prefix}woocommerce_tax_rate_locations" );
$tax_rate_1 = array(
'tax_rate_country' => 'US',
'tax_rate_state' => '',
'tax_rate' => '10.0000',
'tax_rate_name' => 'US',
'tax_rate_priority' => '1',
'tax_rate_compound' => '1',
'tax_rate_shipping' => '1',
'tax_rate_order' => '1',
'tax_rate_class' => ''
);
$tax_rate_2 = array(
'tax_rate_country' => 'US',
'tax_rate_state' => 'AL',
'tax_rate' => '2.0000',
'tax_rate_name' => 'US AL',
'tax_rate_priority' => '2',
'tax_rate_compound' => '1',
'tax_rate_shipping' => '1',
'tax_rate_order' => '2',
'tax_rate_class' => ''
);
$tax_rate_1_id = WC_Tax::_insert_tax_rate( $tax_rate_1 );
$tax_rate_2_id = WC_Tax::_insert_tax_rate( $tax_rate_2 );
$tax_rates = WC_Tax::find_rates( array(
'country' => 'US',
'state' => 'AL',
'postcode' => '12345',
'city' => '',
'tax_class' => ''
) );
// prices exclusive of tax
$calced_tax = WC_Tax::calc_tax( '9.99', $tax_rates, false, false );
$this->assertEquals( $calced_tax, array( $tax_rate_1_id => '0.999', $tax_rate_2_id => '0.2198' ) );
// prices inclusive of tax
$calced_tax = WC_Tax::calc_tax( '9.99', $tax_rates, true, false );
$this->assertEquals( $calced_tax, array( $tax_rate_1_id => '0.8904', $tax_rate_2_id => '0.1959' ) );
WC_Tax::_delete_tax_rate( $tax_rate_1_id );
WC_Tax::_delete_tax_rate( $tax_rate_2_id );
}
/**
* Shipping tax amounts
*/