Modified in accordance with the comments

Author: Konstantin Bulavin

jdi-light-angular/src/main/java/com/epam/jdi/light/angular/elements/complex/ChipGroup.java

@@ -2,7 +2,7 @@
 
 import com.epam.jdi.light.angular.asserts.ChipGroupAssert;
 import com.epam.jdi.light.angular.elements.common.Chip;
-import com.epam.jdi.light.angular.elements.interfaces.HasErrorState;
+import com.epam.jdi.light.angular.elements.interfaces.FormField;
 import com.epam.jdi.light.angular.elements.interfaces.HasOrientation;
 import com.epam.jdi.light.angular.elements.interfaces.IsGroupElement;
 import com.epam.jdi.light.common.JDIAction;
@@ -12,7 +12,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class ChipGroup extends UIBaseElement<ChipGroupAssert> implements IsGroupElement<Chip>, HasOrientation, HasErrorState {
+public class ChipGroup extends UIBaseElement<ChipGroupAssert> implements IsGroupElement<Chip>, HasOrientation, FormField {
 
     public static final String CHIP_LOCATOR = ".mat-mdc-chip";
 

jdi-light-angular/src/main/java/com/epam/jdi/light/angular/elements/interfaces/FormField.java

@@ -0,0 +1,17 @@
+package com.epam.jdi.light.angular.elements.interfaces;
+
+import com.epam.jdi.light.common.JDIAction;
+import com.epam.jdi.light.elements.interfaces.base.ICoreElement;
+
+public interface FormField extends ICoreElement {
+
+    /**
+     * Checks if element has Error State or not.
+     *
+     * @return {@code true} if element has Error State, otherwise {@code false}
+     */
+    @JDIAction("Get if '{name}' is vertical")
+    default boolean errorState() {
+        return core().hasClass("mat-form-field-invalid");
+    }
+}