temporary disable non working test on Mac

see #21

src/test/java/org/fxmisc/cssfx/test/misc/DisableOnMacCondition.java

@@ -0,0 +1,24 @@
+package org.fxmisc.cssfx.test.misc;
+
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+import java.util.Locale;
+
+public class DisableOnMacCondition implements ExecutionCondition {
+    private static final String MAC_OS = "macos";
+
+    @Override
+    public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
+        final String osName = System.getProperty("os.name");
+        final String cleanOsName = osName
+                .replaceAll("\\s", "")
+                .toLowerCase(Locale.ENGLISH);
+        if(cleanOsName.contains(MAC_OS)) {
+            return ConditionEvaluationResult.disabled("Test disabled on JVM running on " + osName);
+        } else {
+            return ConditionEvaluationResult.enabled("Test enabled, running on " + osName);
+        }
+    }
+}

src/test/java/org/fxmisc/cssfx/test/misc/DisabledOnMac.java

@@ -0,0 +1,14 @@
+package org.fxmisc.cssfx.test.misc;
+
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@ExtendWith(DisableOnMacCondition.class)
+public @interface DisabledOnMac {
+}

src/test/java/org/fxmisc/cssfx/test/ui/BasicUITest.java

@@ -25,6 +25,7 @@
 import javafx.scene.paint.Color;
 import javafx.stage.Stage;
 import org.fxmisc.cssfx.CSSFX;
+import org.fxmisc.cssfx.test.misc.DisabledOnMac;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.testfx.api.FxRobot;
@@ -72,6 +73,7 @@ public void checkCSSIsApplied(FxRobot robot) {
     }
 
     @Test
+    @DisabledOnMac
     public void checkCSSFXCanChangeTheLabelFontColor(FxRobot robot) throws Exception {
         // The CSS used by the UI
         URI basicCSS = BasicUI.class.getResource("basic.css").toURI();