変なreceiverを渡した時のテストを追加

Author: k163377

src/test/kotlin/com/mapk/fastkfunction/FastKFunctionTest.kt

@@ -67,18 +67,25 @@ private class FastKFunctionTest {
     @Nested
     inner class TopLevelFunctionOfTest {
         @Nested
+        @TestInstance(TestInstance.Lifecycle.PER_CLASS)
         inner class KindIsExtensionFunction {
             val function: KFunction<Unit> = String::topLevelExtensionFunc
             val parameters = function.parameters
             val javaMethod = function.javaMethod!!
 
-            @Test
-            fun nullInstanceTest() {
+            @ParameterizedTest
+            @MethodSource("illegalReceiverProvider")
+            fun illegalReceiverTest(receiver: Any?) {
                 assertThrows<IllegalArgumentException> {
-                    FastKFunction.topLevelFunctionOf(function, null, parameters, javaMethod)
+                    FastKFunction.topLevelFunctionOf(function, receiver, parameters, javaMethod)
                 }
             }
 
+            fun illegalReceiverProvider(): Stream<Arguments> = Stream.of(
+                Arguments.of(null),
+                Arguments.of(0)
+            )
+
             @Test
             fun isCorrect() {
                 val result = assertDoesNotThrow {
@@ -95,6 +102,13 @@ private class FastKFunctionTest {
             val parameters = function.parameters
             val javaMethod = function.javaMethod!!
 
+            @Test
+            fun withIllegalReceiverTest() {
+                assertThrows<IllegalArgumentException> {
+                    FastKFunction.topLevelFunctionOf(function, 0, parameters, javaMethod)
+                }
+            }
+
             @Test
             fun withInstanceTest() {
                 val result = assertDoesNotThrow {