Test calling a prophecy wihout optional parameter

This commit adds a test to reproduce the reported regression. The test
builds a prophecy for a method which has an optional parameter. The
prophecy doesn't expect that the optional parameter will be called.
Calling this mock without the optional parameter (as expected) will
result in an unexpected call with the optional parameter:

1) phpmock\prophecy\RegressionTest::expectingWithoutOptionalParameter
Prophecy\Exception\Call\UnexpectedCallException: Method call:
  - call("arg1", "optional")
  on Double\phpmock\prophecy\OptionalParameterHolder\P15 was not
  expected, expected calls were:
    - call(exact("arg1"))

See also #1

Author: malkusch

tests/RegressionTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace phpmock\prophecy;
+
+use \Prophecy\Prophet;
+
+/**
+ * Regression tests for Prophecy.
+ *
+ * @author Markus Malkusch <[email protected]>
+ * @link bitcoin:1335STSwu9hST4vcMRppEPgENMHD2r1REK Donations
+ * @license http://www.wtfpl.net/txt/copying/ WTFPL
+ */
+class RegressionTest extends \PHPUnit_Framework_TestCase
+{
+
+    /**
+     * Calling no optional parameter
+     *
+     * @test
+     * @see https://github.com/php-mock/php-mock-prophecy/issues/1
+     */
+    public function expectingWithoutOptionalParameter()
+    {
+        $prophet = new Prophet();
+        $prophecy = $prophet->prophesize(OptionalParameterHolder::class);
+        $prophecy->call("arg1")->willReturn("mocked");
+        $mock = $prophecy->reveal();
+        
+        $this->assertEquals("mocked", $mock->call("arg1"));
+        $prophet->checkPredictions();
+    }
+}
+
+// @codingStandardsIgnoreStart
+class OptionalParameterHolder
+{
+
+    public function call($arg1, $optional = "optional")
+    {
+        return $arg1 . $optional;
+    }
+}
+// @codingStandardsIgnoreEnd