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<?php |
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namespace Tests; |
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use CurrencyConverter\CurrencyConverter; |
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use CurrencyConverter\Rates; |
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class CurrencyConverterTest extends \PHPUnit\Framework\TestCase |
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{ |
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/** |
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* @expectedException \Exception |
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*/ |
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public function testConvertWithNotExistingApiKey() |
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{ |
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$currencyConverter = new CurrencyConverter('apiKey'); |
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$currencyConverter->convert('foo', 'bar', random_int(1, 999999)); |
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} |
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public function testConvertWithinValidCurrencyProvided() |
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{ |
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$fromCurrency = 'EUR'; |
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$toCurrency = 'USD'; |
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$expected = 100; |
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$rates = $this->prophesize(Rates::class); |
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$rates->getRates($fromCurrency, $toCurrency)->willReturn($expected); |
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$currencyConverter = new CurrencyConverter('apiKey'); |
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$currencyConverter->setRates($rates->reveal()); |
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$result = $currencyConverter->convert($fromCurrency, $toCurrency, random_int(1, 999999)); |
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$this->assertNotEquals($expected, $result); |
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} |
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View Code Duplication |
public function testConvertWithNotValidResponseReturn0() |
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{ |
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$fromCurrency = 'EUR'; |
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$toCurrency = 'USD'; |
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$value = 0; |
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$rates = $this->prophesize(Rates::class); |
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$rates->getRates($fromCurrency, $toCurrency)->willReturn($value); |
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$currencyConverter = new CurrencyConverter('apiKey'); |
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$currencyConverter->setRates($rates->reveal()); |
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$result = $currencyConverter->convert($fromCurrency, $toCurrency, random_int(1, 999999)); |
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$this->assertEquals(0, $result); |
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} |
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View Code Duplication |
public function testGetRates() |
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{ |
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$fromCurrency = 'EUR'; |
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$toCurrency = 'USD'; |
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$value = 100; |
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$rates = $this->prophesize(Rates::class); |
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$rates->getRates($fromCurrency, $toCurrency)->willReturn($value); |
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$currencyConverter = new CurrencyConverter('apiKey'); |
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$currencyConverter->setRates($rates->reveal()); |
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$result = $currencyConverter->getRates($fromCurrency, $toCurrency); |
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$this->assertEquals($value, $result); |
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} |
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public function setTestApiCaller() |
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{ |
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$apiCallerMock = $this->prophesize(ApiCaller::class); |
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$currencyConverter = new CurrencyConverter('apiKey'); |
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$currencyConverter->setApiCaller($apiCaller->reveal()); |
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$apiCaller = $currencyConverter->getApiCaller(); |
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$this->assertEquals($apiCallerMock, $apiCaller); |
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} |
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} |
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This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$x
would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.