Removing throwing of IllegalStateException

Convert throwing of IllegalStateException to setting a boolean variable, printing an error with DebugTool, and returning
Changed unit tests to reflect this new intended behavior
Added a private boolean variable and public getter function to make unit testing simpler
The alternative to reading a flag to trigger tests failing is reading logs programmatically, which is more complicated and less reliable

android/sdl_android/src/androidTest/java/com/smartdevicelink/managers/screen/SoftButtonManagerTests.java

@@ -44,6 +44,7 @@
 import java.util.Collections;
 import java.util.List;
 
+
 import static junit.framework.TestCase.assertEquals;
 import static junit.framework.TestCase.assertFalse;
 import static junit.framework.TestCase.assertNull;
@@ -56,13 +57,12 @@
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
-import junit.framework.TestCase;
-
 /**
  * This is a unit test class for the SmartDeviceLink library manager class :
  * {@link SoftButtonManager}
  */
 @RunWith(AndroidJUnit4.class)
+//@RunWith(JUnit4.class)
 public class SoftButtonManagerTests {
 
     private SoftButtonManager softButtonManager;
@@ -411,14 +411,12 @@ public void testSoftButtonStateEquals() {
     @Test
     public void testConstructSoftButtonObjectWithEmptyStateList() {
         List<SoftButtonState> stateList = new ArrayList<>();
+        // Uncommenting the following lines should make the test fail
+        // SoftButtonState softButtonState = new SoftButtonState("object1-state1", "o1s1", null);
+        // stateList.add(softButtonState);
+        SoftButtonObject softButtonObject = new SoftButtonObject("hi", stateList, "Hi", null);
 
-        try {
-            new SoftButtonObject("hi", stateList, "Hi", null);
-            TestCase.fail("IllegalStateException expected");
-        }
-        catch (IllegalStateException ignored) {
-
-        }
+        assertTrue(softButtonObject.getAttemptedToAssignEmptyStateList());
     }
 
     /**
@@ -429,14 +427,9 @@ public void testAssignEmptyStateListToSoftButtonObject() {
         List<SoftButtonState> stateList = new ArrayList<>();
         SoftButtonState softButtonState = new SoftButtonState("object1-state1", "o1s1", null);
 
-
-        try {
-            SoftButtonObject softButtonObject = new SoftButtonObject("hi", softButtonState, null);
-            softButtonObject.setStates(stateList);
-            TestCase.fail("IllegalStateException expected");
-        }
-        catch (IllegalStateException ignored) {
-
-        }
+        SoftButtonObject softButtonObject = new SoftButtonObject("hi", softButtonState, null);
+        // Commenting the following line should make the test fail
+        softButtonObject.setStates(stateList);
+        assertTrue(softButtonObject.getAttemptedToAssignEmptyStateList());
     }
 }

base/src/main/java/com/smartdevicelink/managers/screen/SoftButtonObject.java

@@ -38,6 +38,7 @@
 import com.smartdevicelink.proxy.rpc.OnButtonPress;
 import com.smartdevicelink.proxy.rpc.SoftButton;
 import com.smartdevicelink.util.DebugTool;
+import com.smartdevicelink.util.Log;
 
 import java.util.Collections;
 import java.util.List;
@@ -61,6 +62,7 @@ public class SoftButtonObject implements Cloneable{
     private int buttonId;
     private OnEventListener onEventListener;
     private UpdateListener updateListener;
+    private boolean attemptedToAssignEmptyStateList = false;
 
     /**
      * Create a new instance of the SoftButtonObject with multiple states
@@ -70,7 +72,6 @@ public class SoftButtonObject implements Cloneable{
      * @param initialStateName a String value represents the name for the initial state
      * @param onEventListener  a listener that has a callback that will be triggered when a button event happens
      *                         Note: the initialStateName should match exactly the name of one of the states for the object. Otherwise an exception will be thrown.
-     * @throws IllegalStateException if states is an empty list
      */
     public SoftButtonObject(@NonNull String name, @NonNull List<SoftButtonState> states, @NonNull String initialStateName, OnEventListener onEventListener) {
 
@@ -264,12 +265,13 @@ public List<SoftButtonState> getStates() {
      * Set the the SoftButtonState list
      *
      * @param states a list of the object's soft button states. <strong>states should be unique for every SoftButtonObject. A SoftButtonState instance cannot be reused for multiple SoftButtonObjects.</strong>
-     * @throws IllegalStateException if states is an empty list
      */
     public void setStates(@NonNull List<SoftButtonState> states) {
-        // Make sure the list of states is not empty
-        if (states.isEmpty()) {
-            throw new IllegalStateException("The state list is empty");
+        // If the list of states is empty, throw an error with DebugTool and return
+        attemptedToAssignEmptyStateList = states.isEmpty();
+        if (attemptedToAssignEmptyStateList) {
+            DebugTool.logError(TAG,"The state list is empty");
+            return;
         }
 
         this.states = states;
@@ -403,4 +405,13 @@ public SoftButtonObject clone() {
         }
         return null;
     }
+
+    /**
+     * Used to make unit testing easier by removing the need to read debug logs programmatically
+     *
+     * @return True if the last list passed to setStates() was empty and false otherwise
+     */
+    public boolean getAttemptedToAssignEmptyStateList() {
+        return attemptedToAssignEmptyStateList;
+    }
 }