Add unit tests

Author: pbernet

src/test/scala/tools/SrtParserSpec.scala

@@ -0,0 +1,82 @@
+package tools
+
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatest.matchers.should.Matchers
+
+import java.io.PrintWriter
+import java.nio.file.Files
+
+class SrtParserSpec extends AnyFunSuite with Matchers {
+
+  test("parse valid srt file") {
+    val parser = new SrtParser("src/main/resources/EN_challenges.srt")
+    val blocks = parser.runSync()
+
+    blocks.nonEmpty shouldBe true
+    blocks.head.lines.nonEmpty shouldBe true
+  }
+
+  test("convert subtitle block to formatted output") {
+    val block = SubtitleBlock(
+      start = 1000,
+      end = 4000,
+      lines = Seq("First line", "Second line")
+    )
+    val formatted = block.formatOutBlock(1)
+
+    formatted should include("00:00:01,000 --> 00:00:04,000")
+    formatted should include("First line")
+    formatted should include("Second line")
+  }
+
+  test("parse subtitle block with multiple lines") {
+    val block = SubtitleBlock(
+      start = 0,
+      end = 2000,
+      lines = Seq("Line 1", "Line 2", "Line 3")
+    )
+    block.allLines shouldBe "Line 1 Line 2 Line 3"
+  }
+
+  test("format time correctly") {
+    val block = SubtitleBlock(
+      start = 3661000, // 1 hour, 1 minute, 1 second
+      end = 3662000, // 1 hour, 1 minute, 2 seconds
+      lines = Seq("Test")
+    )
+    val formatted = block.formatOutBlock(1)
+
+    formatted should include("01:01:01,000 --> 01:01:02,000")
+  }
+
+
+  test("handle empty subtitle file") {
+    val tempFile = Files.createTempFile("empty", ".srt")
+    tempFile.toFile.deleteOnExit()
+    val parser = new SrtParser(tempFile.toString)
+    val blocks = parser.runSync()
+
+    blocks shouldBe empty
+  }
+
+  test("handle invalid srt file format") {
+    val tempFile = Files.createTempFile("invalid", ".srt")
+    tempFile.toFile.deleteOnExit()
+    val writer = new PrintWriter(tempFile.toFile)
+    writer.write(
+      """
+        |Invalid Format
+        |No timestamps here
+        |Just random text
+        |Without proper structure
+        |---> wrong separator
+    """.stripMargin)
+    writer.close()
+
+    val parser = new SrtParser(tempFile.toString)
+
+    assertThrows[java.time.format.DateTimeParseException] {
+      parser.runSync()
+    }
+  }
+}