Tests for FileNameService

src/test/scala/fetch/FileNameServiceSpec.scala

@@ -0,0 +1,35 @@
+import fetch.FileNameService
+import org.scalatest.funsuite.AnyFunSuite
+
+import java.time.LocalDateTime
+
+class FileNameServiceSpec extends AnyFunSuite {
+
+  test("FileNameService.generate returns correct file names") {
+    val startTime = LocalDateTime.of(2023, 5, 17, 0, 0)
+    val endTime = LocalDateTime.of(2023, 5, 17, 4, 0)
+
+    val expectedFileNames = List(
+      "20230517_0030.csv",
+      "20230517_0130.csv",
+      "20230517_0230.csv",
+      "20230517_0330.csv",
+    )
+
+    val actualFileNames = FileNameService.generate(startTime, endTime)
+
+    assert(actualFileNames == expectedFileNames)
+  }
+
+  test("FileNameService.generateFromDate returns correct file names") {
+    val date = LocalDateTime.of(2023, 5, 17, 0, 0).toLocalDate
+
+    val expectedFileNames = (0 to 23).toList
+      .map(hour => if(hour < 10) "0"+hour else ""+hour)
+      .map(str => s"20230517_${str}30.csv")
+
+    val actualFileNames = FileNameService.generateFromDate(date)
+
+    assert(actualFileNames == expectedFileNames)
+  }
+}