style: Rename exception message

Author: fnakhsan

src/main/kotlin/com/fnakhsan/toprotobufconverter/core/PluginException.kt

@@ -19,7 +19,7 @@ class KotlinStructureException :
     PluginException("Kotlin exception:", "incorrect structure, try on kotlin data class")
 
 class WrongFileNameException :
-    PluginException("Wrong file name:", "Files should be named with lower_snake_case")
+    PluginException("Wrong file name:", "Files cannot be empty and must be named with lower_snake_case")
 
 class PathException :
     PluginException(

src/test/kotlin/com/fnakhsan/toprotobufconverter/core/PluginExceptionTest.kt

@@ -11,6 +11,16 @@ internal class PluginExceptionTest {
         kotlin.test.assertEquals("File creation exception:", exception.header)
     }
 
+    @Test
+    fun check_SourceException() {
+        val exception = SourceException()
+        kotlin.test.assertEquals(
+            "You should choose another language to be converted into Protocol Buffers Schema files, before call this plugin",
+            exception.message
+        )
+        kotlin.test.assertEquals("Language is not available:", exception.header)
+    }
+
     @Test
     fun check_KotlinStructureException() {
         val exception = KotlinStructureException()
@@ -21,7 +31,7 @@ internal class PluginExceptionTest {
     @Test
     fun check_WrongFileNameException() {
         val exception = WrongFileNameException()
-        kotlin.test.assertEquals("Files should be named with lower_snake_case", exception.message)
+        kotlin.test.assertEquals("Files cannot be empty and must be named with lower_snake_case", exception.message)
         kotlin.test.assertEquals("Wrong file name:", exception.header)
     }
 }

src/test/kotlin/com/fnakhsan/toprotobufconverter/listeners/GenerateActionListenerTest.kt

@@ -44,7 +44,7 @@ internal class GenerateActionListenerTest {
     fun setUp() = MockKAnnotations.init(this, relaxUnitFun = true)
 
     @Test
-    fun onActionHandled_withError() {
+    fun actionPerformed_withError() {
         every { messageConversionHelper.validateFileName(any()) } throws exception
         listener.actionPerformed(actionEvent)
         verify { messageDelegate.onPluginExceptionHandled(exception) }