Php Expression Check

src/Checks/Php/Expression.php

@@ -0,0 +1,42 @@
+<?php
+namespace Health\Checks\Php;
+
+use Health\Checks\BaseCheck;
+use Health\Checks\HealthCheckInterface;
+
+class Expression extends BaseCheck implements HealthCheckInterface
+{
+
+    /**
+     *
+     * {@inheritdoc}
+     * @see \Health\Checks\HealthCheckInterface::call()
+     */
+    public function call()
+    {
+        $builder = $this->getBuilder();
+
+        $expression = $this->getParam('expression', '1==1');
+        $result = $this->getParam('result', true);
+
+        $expResult = $this->evalExpression($expression);
+
+        if ((is_bool($result) && $result !== (bool) $expResult) || ! preg_match("|{$result}|", $expResult)) {
+            $builder->down();
+        }
+
+        return $builder->withData('expected_result', $result)
+            ->withData('expression_result', $expResult)
+            ->build();
+    }
+
+    /**
+     *
+     * @param string $expression
+     * @return mixed
+     */
+    private function evalExpression(string $expression)
+    {
+        return eval("return {$expression};");
+    }
+}

tests/Checks/PhpExpressionTest.php

@@ -0,0 +1,32 @@
+<?php
+namespace Tests\Checks;
+
+use Health\Checks\Php\Expression;
+
+class PhpExpressionTest extends CheckTestCase
+{
+
+    public function testCheckPhpClassExists()
+    {
+        $this->assertCheck($this->runCheck(Expression::class, []), 'UP');
+
+        $this->assertCheck($this->runCheck(Expression::class, [
+            'expression' => '1+2'
+        ]), 'DOWN');
+
+        $this->assertCheck($this->runCheck(Expression::class, [
+            'expression' => '1+2',
+            'result' => '3'
+        ]), 'UP');
+
+        $this->assertCheck($this->runCheck(Expression::class, [
+            'expression' => 'max([1,10,45])',
+            'result' => '45'
+        ]), 'UP');
+
+        $this->assertCheck($this->runCheck(Expression::class, [
+            'expression' => "\Health\Checks\Php\Expression::class",
+            'result' => 'Health\\\Checks\\\Php\\\Expression'
+        ]), 'UP');
+    }
+}