[6.x] Fixed vueAttribute for older Vue 2.x projects (#970)

* Fixed vueAttribute for older Vue 2.X projects

* Update MakesAssertionsTest.php

Author: myMartek

src/Concerns/MakesAssertions.php

@@ -1103,7 +1103,7 @@ public function vueAttribute($componentSelector, $key)
         return $this->driver->executeScript(
             "var el = document.querySelector('".$fullSelector."');".
             "if (typeof el.__vue__ !== 'undefined')".
-            '    return el.__vue.'.$key.';'.
+            '    return el.__vue__.'.$key.';'.
             'try {'.
             '    var attr = el.__vueParentComponent.ctx.'.$key.';'.
             "    if (typeof attr !== 'undefined')".

tests/MakesAssertionsTest.php

@@ -1020,7 +1020,7 @@ public function test_assert_vue()
             ->with(
                 "var el = document.querySelector('body foo');".
                 "if (typeof el.__vue__ !== 'undefined')".
-                '    return el.__vue.foo;'.
+                '    return el.__vue__.foo;'.
                 'try {'.
                 '    var attr = el.__vueParentComponent.ctx.foo;'.
                 "    if (typeof attr !== 'undefined')".
@@ -1078,7 +1078,7 @@ public function test_assert_vue_is_not()
             ->with(
                 "var el = document.querySelector('body foo');".
                 "if (typeof el.__vue__ !== 'undefined')".
-                '    return el.__vue.foo;'.
+                '    return el.__vue__.foo;'.
                 'try {'.
                 '    var attr = el.__vueParentComponent.ctx.foo;'.
                 "    if (typeof attr !== 'undefined')".
@@ -1136,7 +1136,7 @@ public function test_assert_vue_contains_formats_vue_prop_query()
             ->with(
                 'var el = document.querySelector(\'body [dusk="vue-component"]\');'.
                 "if (typeof el.__vue__ !== 'undefined')".
-                '    return el.__vue.name;'.
+                '    return el.__vue__.name;'.
                 'try {'.
                 '    var attr = el.__vueParentComponent.ctx.name;'.
                 "    if (typeof attr !== 'undefined')".