Update modular tests to be more reasonable

Author: Sineaggi

okio/src/jvmIntegrationTest/kotlin/okio/test/integration/ModuleTest.kt

@@ -1,21 +1,16 @@
 package okio.test.integration
 
-import okio.FileSystem
-import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class ModuleTest {
   @Test
   fun testModule() {
-    // test okio.test.integration is modular
-    assertTrue(ModuleTest::class.java.module.isNamed)
-    assertEquals(ModuleTest::class.java.module.name, "okio.test.integration")
-    assertFalse(ModuleTest::class.java.module.descriptor.isAutomatic)
-    // test okio is modular
-    assertTrue(FileSystem::class.java.module.isNamed)
-    assertEquals(FileSystem::class.java.module.name, "okio")
-    assertFalse(FileSystem::class.java.module.descriptor.isAutomatic)
+    // assert okio is modular
+    val okioModule = ModuleLayer.boot().modules().single { it.name == "okio" }
+    assertFalse(okioModule.descriptor.isAutomatic)
+    assertTrue(okioModule.isExported("okio"))
+    assertFalse(okioModule.isExported("okio.internal"))
   }
 }