Reuse asset paths mapping from sut in the test class

include-build/roborazzi-gradle-plugin/src/test/java/io/github/takahirom/roborazzi/WebAssetsTest.kt

@@ -1,6 +1,7 @@
 package io.github.takahirom.roborazzi
 
 import junit.framework.TestCase.assertTrue
+import org.junit.Before
 import org.junit.Rule
 import org.junit.rules.TemporaryFolder
 import java.io.File
@@ -11,21 +12,22 @@ class WebAssetsTest {
   @get:Rule
   val tmpDir: TemporaryFolder = TemporaryFolder.builder().assureDeletion().build()
 
+  private lateinit var sut: WebAssets
+
+  @Before
+  fun setUp() {
+    sut = WebAssets.create()
+  }
+
   @Test
   fun testWritesWebAssetsSuccessfullyToReportsDirectory() {
     val reportDir = tmpDir.newFolder("roborazzi-reports")
-    val cssFile = File(reportDir, "assets/report-style.css")
-    val materializeCssFile = File(reportDir, "assets/materialize.min.css")
-    val materializeJsFile = File(reportDir, "assets/materialize.min.js")
-    val materialIconsCssFile = File(reportDir, "assets/material-icons.css")
-    val materialIconsTtfFile = File(reportDir, "assets/MaterialIcons-Regular.ttf")
-
-    WebAssets.create().writeToRoborazziReportsDir(reportDir)
-
-    assertTrue(cssFile.exists())
-    assertTrue(materializeCssFile.exists())
-    assertTrue(materializeJsFile.exists())
-    assertTrue(materialIconsCssFile.exists())
-    assertTrue(materialIconsTtfFile.exists())
+    val assetFiles = sut.assets.map { File(reportDir, "assets/$it") }
+
+   sut.writeToRoborazziReportsDir(reportDir)
+
+    assetFiles.forEach { file->
+      assertTrue(file.exists())
+    }
   }
 }