Allow assertion of available options on a given select element

src/Concerns/MakesAssertions.php

@@ -512,6 +512,66 @@ public function assertNotSelected($field, $value)
         return $this;
     }
 
+    /**
+     * Assert that the given array of values are available to be selected on the given field.
+     *
+     * @param string  $field
+     * @param array  $values
+     * @return $this
+     */
+    public function assertOptionsAvailable($field, array $values)
+    {
+        PHPUnit::assertCount(
+            count($values),
+            $this->resolver->resolveSelectOptions($field, $values),
+            "Expected options [".implode(',', $values)."] for select [{$field}] to be available, but it wasn't."
+        );
+
+        return $this;
+    }
+
+    /**
+     * Assert that the given array of values are not available to be selected on the given field.
+     *
+     * @param string  $field
+     * @param array  $values
+     * @return $this
+     */
+    public function assertOptionsNotAvailable($field, array $values)
+    {
+        PHPUnit::assertCount(
+            0,
+            $this->resolver->resolveSelectOptions($field, $values),
+            "Unexpected available options [".implode(',', $values)."] for select [{$field}]."
+        );
+
+        return $this;
+    }
+
+    /**
+     * Assert that the given value is available to be selected on the given field.
+     *
+     * @param string  $field
+     * @param string  $value
+     * @return $this
+     */
+    public function assertOptionAvailable($field, $value)
+    {
+        return $this->assertOptionsAvailable($field, [$value]);
+    }
+
+    /**
+     * Assert that the given value is not available to be selected on the given field.
+     *
+     * @param string  $field
+     * @param string  $value
+     * @return $this
+     */
+    public function assertOptionNotAvailable($field, $value)
+    {
+        return $this->assertOptionsNotAvailable($field, [$value]);
+    }
+
     /**
      * Determine if the given value is selected for the given select field.
      *

src/ElementResolver.php

@@ -106,6 +106,26 @@ public function resolveForSelection($field)
         ]);
     }
 
+    /**
+     * Resolve all the options with the given value on the select field.
+     *
+     * @param string  $field
+     * @param array  $values
+     * @return array
+     */
+    public function resolveSelectOptions($field, array $values)
+    {
+        $options = $this->resolveForSelection($field)
+            ->findElements(WebDriverBy::tagName('option'));
+
+        if (empty($options))
+            return [];
+
+        return array_filter($options, function($option) use ($values) {
+            return in_array($option->getAttribute('value'), $values);
+        });
+    }
+
     /**
      * Resolve the element for a given radio "field" / value.
      *