Add real FFmpeg scheduler integration test

docs/input-folder-scheduler-plan.md

@@ -29,7 +29,7 @@ Note: the local machine's filesystem root is read-only in this workspace, so abs
 9. [x] Add success handling that moves processed source files to processed storage.
 10. [x] Add failure handling for FFmpeg or filesystem errors.
 11. [x] Add unit tests for ordering, invalid-file handling, repeat prevention, and state transitions.
-12. [ ] Add optional FFmpeg integration test for a short fixture.
+12. [x] Add optional FFmpeg integration test for a short fixture.
 13. [ ] Add local profile or documented runtime config for enabling the scheduler.
 14. [ ] Run verification and mark feature complete.
 

src/test/java/org/example/videoclips/folder/FolderFfmpegIntegrationTest.java

@@ -0,0 +1,68 @@
+package org.example.videoclips.folder;
+
+import org.example.videoclips.config.VideoClippingProperties;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledIf;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@EnabledIf("toolsAvailable")
+class FolderFfmpegIntegrationTest {
+
+    @TempDir
+    Path tempDir;
+
+    @Test
+    void createsThreeEightSecondMp4ClipsFromSeventeenSecondVideo() throws Exception {
+        Path source = tempDir.resolve("sample.mp4");
+        run(List.of(
+                "ffmpeg", "-hide_banner", "-loglevel", "error", "-y",
+                "-f", "lavfi", "-i", "testsrc2=size=320x240:rate=24",
+                "-f", "lavfi", "-i", "sine=frequency=1000:sample_rate=48000",
+                "-t", "17",
+                "-c:v", "libx264", "-pix_fmt", "yuv420p",
+                "-c:a", "aac", "-shortest",
+                source.toString()
+        ));
+        VideoClippingProperties properties = new VideoClippingProperties();
+        Path outputRoot = Files.createDirectory(tempDir.resolve("output"));
+        properties.getFolderScheduler().setOutputDirectory(outputRoot.toString());
+
+        assertTrue(new FolderVideoValidator(properties).validate(source).valid());
+        FolderFfmpegClipper.ClipResult result = new FolderFfmpegClipper(properties).clip(source);
+
+        assertEquals(outputRoot.resolve("sample"), result.outputDirectory());
+        assertEquals(3, result.clipCount());
+        assertTrue(Files.isRegularFile(result.outputDirectory().resolve("clip_00000.mp4")));
+        assertTrue(Files.isRegularFile(result.outputDirectory().resolve("clip_00001.mp4")));
+        assertTrue(Files.isRegularFile(result.outputDirectory().resolve("clip_00002.mp4")));
+    }
+
+    static boolean toolsAvailable() {
+        return commandAvailable("ffmpeg") && commandAvailable("ffprobe");
+    }
+
+    private static boolean commandAvailable(String command) {
+        try {
+            return new ProcessBuilder(command, "-version").start().waitFor() == 0;
+        } catch (IOException ex) {
+            return false;
+        } catch (InterruptedException ex) {
+            Thread.currentThread().interrupt();
+            return false;
+        }
+    }
+
+    private void run(List<String> command) throws Exception {
+        Process process = new ProcessBuilder(command).redirectErrorStream(true).start();
+        String output = new String(process.getInputStream().readAllBytes());
+        assertEquals(0, process.waitFor(), output);
+    }
+}