add a test to check that return type of getAllGameResults is explicit…

…ly specified

wordsGeneratorServer/wordsGeneratorServerFinishGame/task.md

@@ -11,13 +11,13 @@ the `jetbrains.kotlin.course.words.generator.results` package. Note, this class
 - Implement the `saveGameResults` method, which adds `result` to `gameHistory`.
   Before adding `result`, you need to check for two requirements and throw an error if they are broken: 1) `result` must
   not be empty; 2) all team ids in `result` must be present in `TeamService.teamsStorage`.
-- Implement the `getAllGameResults` method, which returns the reversed `gameHistory` list.
+- Implement the `getAllGameResults` method, which returns the reversed `gameHistory` list. Its return type should be specified explicitly.
 
 
 <div class="hint" title="Click me if you pressed Check and found a compilation error">
 
   If you have a compilation error and you have not solved this step yet, please solve the task and try again. 
-  It is expected behavior, since the code requires the type alia `GameResult`, but it does not exist.
+  It is expected behavior, since the code requires the type alias `GameResult`, but it does not exist.
 </div>
 
 

wordsGeneratorServer/wordsGeneratorServerFinishGame/test/Tests.kt

@@ -1,13 +1,16 @@
 import commonTests.team.*
 import jetbrains.kotlin.course.words.generator.util.words
+import org.jetbrains.academy.test.system.findMethod
 import org.jetbrains.academy.test.system.models.classes.ConstructorGetter
 import org.jetbrains.academy.test.system.models.classes.findClass
 import org.jetbrains.academy.test.system.models.method.TestMethodInvokeData
+import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.Arguments
 import org.junit.jupiter.params.provider.MethodSource
 import java.lang.reflect.Field
+import kotlin.reflect.jvm.kotlinFunction
 
 class Test {
     companion object {
@@ -33,6 +36,14 @@ class Test {
                 ConstructorGetter(),
             )
         )
+
+        val methodKFunction = clazz.methods.findMethod(getAllGameResultsMethod).kotlinFunction
+        val methodReturnType = (methodKFunction ?: error("Method getAllGameResults doesn't exist")).returnType
+        Assertions.assertTrue(methodReturnType.arguments.size == 1,
+            "Return type of method getAllGameResults should have 1 type argument")
+        Assertions.assertTrue((methodReturnType.arguments.first().type?.toString() ?: "").contains("GameResult"),
+            "Return type of method getAllGameResults should be specified explicitly as List<GameResult>")
+
         gameResultsServiceTestClass.checkDeclaredMethods(clazz)
     }
 
@@ -233,4 +244,4 @@ class Test {
             getIdFromTeamMethod
         ) { constructor.newInstance() }
     }
-}
+}