Added a test

Author: SakiTakamachi

ext/bcmath/tests/bcdiv_by_one.phpt

@@ -0,0 +1,66 @@
+--TEST--
+bcdiv() function div by one
+--EXTENSIONS--
+bcmath
+--INI--
+bcmath.scale=0
+--FILE--
+<?php
+$dividend_cases = ['100', '-100'];
+$divisor_cases = ['1.010', '1.01', '1.1', '1'];
+$scale_cases = [0, 1, 2, 3];
+
+foreach ($scale_cases as $scale) {
+    echo "scale: {$scale}\n";
+    foreach ($divisor_cases as $divisor) {
+        foreach ($dividend_cases as $dividend) {
+            $dividend_label = str_pad($dividend, 4, ' ', STR_PAD_LEFT);
+            $divisor_label = str_pad($divisor, 5, ' ', STR_PAD_LEFT);
+            $quot = bcdiv($dividend, $divisor, $scale);
+            $quot_label = str_pad($quot, $scale + 2 + ($scale ? 1 : 0), ' ', STR_PAD_LEFT);
+            echo $dividend_label, ' / ', $divisor_label, ' = ', $quot_label, "\n";
+        }
+    }
+    echo "\n";
+}
+?>
+--EXPECT--
+scale: 0
+ 100 / 1.010 = 99
+-100 / 1.010 = -99
+ 100 /  1.01 = 99
+-100 /  1.01 = -99
+ 100 /   1.1 = 90
+-100 /   1.1 = -90
+ 100 /     1 = 100
+-100 /     1 = -100
+
+scale: 1
+ 100 / 1.010 = 99.0
+-100 / 1.010 = -99.0
+ 100 /  1.01 = 99.0
+-100 /  1.01 = -99.0
+ 100 /   1.1 = 90.9
+-100 /   1.1 = -90.9
+ 100 /     1 = 100.0
+-100 /     1 = -100.0
+
+scale: 2
+ 100 / 1.010 = 99.00
+-100 / 1.010 = -99.00
+ 100 /  1.01 = 99.00
+-100 /  1.01 = -99.00
+ 100 /   1.1 = 90.90
+-100 /   1.1 = -90.90
+ 100 /     1 = 100.00
+-100 /     1 = -100.00
+
+scale: 3
+ 100 / 1.010 = 99.009
+-100 / 1.010 = -99.009
+ 100 /  1.01 = 99.009
+-100 /  1.01 = -99.009
+ 100 /   1.1 = 90.909
+-100 /   1.1 = -90.909
+ 100 /     1 = 100.000
+-100 /     1 = -100.000