compare result of evaluated xpath expression to value

src/Codeception/Module/REST.php

@@ -1100,6 +1100,67 @@ public function seeResponseJsonMatchesXpath(string $xPath): void
         );
     }
 
+    /**
+     * Checks if applying xpath to json structure in response matches the expected result.
+     * JSON is not supposed to be checked against XPath, yet it can be converted to xml and used with XPath.
+     * This assertion allows you to check the structure of response json.
+     *     *
+     * ```json
+     *   { "store": {
+     *       "book": [
+     *         { "category": "reference",
+     *           "author": "Nigel Rees",
+     *           "title": "Sayings of the Century",
+     *           "price": 8.95
+     *         },
+     *         { "category": "fiction",
+     *           "author": "Evelyn Waugh",
+     *           "title": "Sword of Honour",
+     *           "price": 12.99
+     *         }
+     *    ],
+     *       "bicycle": {
+     *         "color": "red",
+     *         "price": 19.95
+     *       }
+     *     }
+     *   }
+     * ```
+     *
+     * ```php
+     * <?php
+     * // at least one book in store has author
+     * $I->seeResponseJsonXpathEvaluatesTo('count(//store/book/author) > 0', true);
+     * // count the number of books written by given author is 5
+     * $I->seeResponseJsonMatchesXpath("//author[text() = 'Nigel Rees']", 1.0);
+     * ```
+     * @part json
+     */
+    public function seeResponseJsonXpathEvaluatesTo(string $xPath, $expected): void
+    {
+        $response = $this->connectionModule->_getResponseContent();
+        $this->assertEquals(
+            $expected,
+            (new JsonArray($response))->evaluateXPath($xPath),
+            "Received JSON did not evualated XPath `{$xPath}` as expected.\nJson Response: \n" . $response
+        );
+    }
+
+    /**
+     * Opposite to seeResponseJsonXpathEvaluatesTo
+     *
+     * @part json
+     */
+    public function dontSeeResponseJsonXpathEvaluatesTo(string $xPath, $expected): void
+    {
+        $response = $this->connectionModule->_getResponseContent();
+        $this->assertNotEquals(
+            $expected,
+            (new JsonArray($response))->evaluateXPath($xPath),
+            "Received JSON did not evualated XPath `{$xPath}` as expected.\nJson Response: \n" . $response
+        );
+    }
+
     /**
      * Opposite to seeResponseJsonMatchesXpath
      *

src/Codeception/Util/JsonArray.php

@@ -75,6 +75,12 @@ public function filterByXPath(string $xPath): DOMNodeList|false
         $path = new DOMXPath($this->toXml());
         return $path->query($xPath);
     }
+
+    public function evaluateXPath(string $xPath): mixed
+    {
+        $path = new DOMXPath($this->toXml());
+        return $path->evaluate($xPath);
+    }
 
     public function filterByJsonPath(string $jsonPath): array
     {

tests/unit/Codeception/Module/RestTest.php

@@ -566,6 +566,31 @@ public function testSeeResponseJsonMatchesXpathCanHandleResponseWithOneSubArray(
         $this->module->seeResponseJsonMatchesXpath('//array/success');
     }
 
+
+    public function testSeeResponseJsonXpathEvaluatesToBoolean()
+    {
+        $this->setStubResponse('{"success": 1}');
+        $this->module->seeResponseJsonXpathEvaluatesTo('count(//success) > 0', true);
+    }
+
+    public function testSeeResponseJsonXpathEvaluatesToNumber()
+    {
+        $this->setStubResponse('{"success": 1}');
+        $this->module->seeResponseJsonXpathEvaluatesTo('count(//success)', 1.0);
+    }
+
+    public function testDontSeeResponseJsonXpathEvaluatesToBoolean()
+    {
+        $this->setStubResponse('{"success": 1}');
+        $this->module->dontSeeResponseJsonXpathEvaluatesTo('count(//success) > 0', false);
+    }
+
+    public function testDontSeeResponseJsonXpathEvaluatesToNumber()
+    {
+        $this->setStubResponse('{"success": 1}');
+        $this->module->dontSeeResponseJsonXpathEvaluatesTo('count(//success)', 0.0);
+    }
+
     public function testSeeBinaryResponseEquals()
     {
         $data = base64_decode('/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=');

tests/unit/Codeception/Util/JsonArrayTest.php

@@ -36,6 +36,13 @@ public function testXmlArrayConversion2()
         $this->assertSame(2, $jsonArray->filterByXPath('//user')->length);
     }
 
+    public function testXPathEvaluation()
+    {
+        $this->assertSame(true, $this->jsonArray->evaluateXPath('count(//ticket/title)>0'));
+        $this->assertEquals(1.0 , $this->jsonArray->evaluateXPath('count(//ticket/user/name)'));
+        $this->assertSame(true, $this->jsonArray->evaluateXPath("count(//user/name[text() = 'Davert']) > 0"));
+    }
+
     public function testXPathLocation()
     {
         $this->assertGreaterThan(0, $this->jsonArray->filterByXPath('//ticket/title')->length);