#5 added throwing runtime exception when methods in wrappable interface have more than 2 parameters

Author: programmerr47

Diff for: ganalytics-core/src/main/java/com/github/programmerr47/ganalytics/core/AnalyticsSingleWrapper.kt

@@ -18,7 +18,11 @@ class AnalyticsSingleWrapper(private val eventProvider: EventProvider) : Analyti
                 applyPrefix(defaultAction, category, method, clazz)
             }
 
-            val label = (args.firstOrNull() ?: "").toString()
+            if (method.parameterCount > 2) {
+                throw IllegalArgumentException("Method ${method.name} have ${method.parameterCount} parameter(s). You can have up to 2 parameters in methods.")
+            }
+
+            val label = (args?.firstOrNull() ?: "").toString()
 
             val event = Event(category, action, label)
             eventProvider.provide(event)

Diff for: ganalytics-core/src/test/java/com/github/programmerr47/ganalytics/core/LabelDefaultsTest.kt

@@ -17,4 +17,12 @@ class LabelDefaultsTest : AnalyticsWrapperTest {
             assertEquals(Event("singleparametermethodinterface", "dummyEnumClassMethod", "TWO")) { dummyEnumClassMethod(DummyEnum.TWO) }
         }
     }
+
+    @Test(expected = IllegalArgumentException::class)
+    fun throwErrorInMoreThanTwoParameterMethod() {
+        run(MoreTwoParameterMethodInterface::class) {
+            assertEquals(Event("moretwoparametermethodinterface", "method1")) { method1() }
+            method2("1", 2, 3L)
+        }
+    }
 }

Diff for: ganalytics-core/src/test/java/com/github/programmerr47/ganalytics/core/test_interfaces.kt

@@ -74,4 +74,9 @@ interface SingleParameterMethodInterface {
     fun dummyClassMethod(param: DummyClass)
     fun dummyDataClassMethod(param: DummyDataClass)
     fun dummyEnumClassMethod(param: DummyEnum)
+}
+
+interface MoreTwoParameterMethodInterface {
+    fun method1()
+    fun method2(param1: String, param2: Int, param3: Long)
 }