[java] Fixing unit tests for Preferences that check setting frozen preferences

Author: barancev

java/client/test/org/openqa/selenium/firefox/PreferencesTest.java

@@ -107,9 +107,10 @@ public void parsePreferences_multiline() {
   public void cannotOverrideAFozenPrefence() {
     StringReader reader = new StringReader("{\"frozen\": {\"frozen.pref\": true }, \"mutable\": {}}");
     Preferences preferences = new Preferences(reader);
+    preferences.setPreference("frozen.pref", false);
 
-    assertThatExceptionOfType(IllegalArgumentException.class)
-        .isThrownBy(() -> preferences.setPreference("frozen.pref", false))
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(preferences::checkForChangesInFrozenPreferences)
         .withMessage("Preference frozen.pref may not be overridden: frozen value=true, requested value=false");
   }
 
@@ -126,9 +127,10 @@ public void canOverrideAFrozenPreferenceWithTheFrozenValue() {
   @Test
   public void canOverrideMaxScriptRuntimeIfGreaterThanDefaultValueOrSetToInfinity() {
     Preferences preferences = new Preferences(defaults);
+    preferences.setPreference("dom.max_script_run_time", 29);
 
-    assertThatExceptionOfType(IllegalArgumentException.class)
-        .isThrownBy(() -> preferences.setPreference("dom.max_script_run_time", 29))
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(preferences::checkForChangesInFrozenPreferences)
         .withMessage("dom.max_script_run_time must be == 0 || >= 30");
 
     preferences.setPreference("dom.max_script_run_time", 31);