test: add unit test for setStep IllegalArgumentException

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vursen

vaadin-slider-flow-parent/vaadin-slider-flow/src/main/java/com/vaadin/flow/component/slider/Slider.java

@@ -70,6 +70,10 @@ public Slider(double min, double max, double value) {
         setValue(value);
     }
 
+    /**
+     * @throws IllegalArgumentException
+     *             if the value is not between min and max
+     */
     @Override
     public void setValue(Double value) {
         if (value < getMin() || value > getMax()) {
@@ -85,6 +89,8 @@ public void setValue(Double value) {
      *
      * @param min
      *            the minimum value
+     * @throws IllegalArgumentException
+     *             if the min is greater than the max value
      */
     public void setMin(double min) {
         if (min > getMax()) {
@@ -109,6 +115,8 @@ public double getMin() {
      *
      * @param max
      *            the maximum value
+     * @throws IllegalArgumentException
+     *             if the max is less than the min value
      */
     public void setMax(double max) {
         if (max < getMin()) {
@@ -134,8 +142,15 @@ public double getMax() {
      *
      * @param step
      *            the step value
+     * @throws IllegalArgumentException
+     *             if the step is less than or equal to zero
      */
     public void setStep(double step) {
+        if (step <= 0) {
+            throw new IllegalArgumentException(
+                    "The step value must be a positive number");
+        }
+
         getElement().setProperty("step", step);
     }
 

vaadin-slider-flow-parent/vaadin-slider-flow/src/test/java/com/vaadin/flow/component/slider/tests/SliderTest.java

@@ -107,4 +107,10 @@ public void setValue_greaterThanMax_throws() {
         Slider slider = new Slider(0, 100);
         slider.setValue(150.0);
     }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void setStep_notPositive_throws() {
+        Slider slider = new Slider();
+        slider.setStep(0);
+    }
 }