ISTWCMS-4763 Test Default background colour field

tests/src/Functional/UwWcmsBasicTest.php

@@ -1326,6 +1326,17 @@ class UwWcmsBasicTest extends BrowserTestBase {
     $this->clickLink('Facts and figures');
     // The top-level remove button doesn't exist.
     $this->assertNoFieldByName('settings_block_form_field_uw_ff_fact_figure_0_remove');
+    // Check 'Default background colour' field help text.
+    $this->assertSession()->pageTextContains('When gold is selected, the default colour will always be black.');
+    // Check 'Default background colour' field default value.
+    $this->assertFieldByXPath('//option[@value="grey" and @selected="selected"]', NULL, 'Grey is selected.');
+    $this->assertFieldByName('settings[block_form][field_uw_ff_fact_figure][0][subform][field_uw_ff_def_color]');
+    // Select 'gold', then 'Default background colour' field is gone.
+    $this->getSession()->getPage()->selectFieldOption('settings[block_form][field_uw_ff_fact_figure][0][subform][field_uw_ff_dbg_color]', 'gold');
+    $this->assertTrue($this->assertSession()->optionExists('Default background colour', 'gold')->isSelected());
+    // Select 'black', then 'Default background colour' field shows.
+    $this->getSession()->getPage()->selectFieldOption('settings[block_form][field_uw_ff_fact_figure][0][subform][field_uw_ff_dbg_color]', 'black');
+    $this->assertTrue($this->assertSession()->optionExists('Default background colour', 'black')->isSelected());
     // The default color is 'Default[uWaterloo]' and not have "none" option.
     $options = $this->getOptions('settings[block_form][field_uw_ff_fact_figure][0][subform][field_uw_ff_def_color]');
     foreach ($options as $option) {