app: harden mirroring lifecycle and state

1 files changed, 36 insertions, 0 deletions

diff --git a/app/src/test/java/invalid/lena/scrcpy/CrashlogTest.java b/app/src/test/java/invalid/lena/scrcpy/CrashlogTest.java
new file mode 100644
index 0000000..41c05a1
--- /dev/null
+++ b/app/src/test/java/invalid/lena/scrcpy/CrashlogTest.java
@@ -0,0 +1,36 @@
+package invalid.lena.scrcpy;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+import java.nio.file.Files;
+
+public class CrashlogTest {
+
+    @Rule
+    public TemporaryFolder dir = new TemporaryFolder();
+
+    @Test
+    public void pruneKeepsNewestCrashlogsOnly() throws Exception {
+        for (int i = 0; i < 7; i++) {
+            File file = new File(dir.getRoot(), "crash-" + i + ".log");
+            Files.write(file.toPath(), new byte[]{(byte) i});
+            assertTrue(file.setLastModified(1_000L + i));
+        }
+        File unrelated = dir.newFile("notes.txt");
+
+        Crashlog.prune(dir.getRoot(), 5);
+
+        File[] logs = dir.getRoot().listFiles((parent, name) -> name.endsWith(".log"));
+        assertEquals(5, logs.length);
+        assertFalse(new File(dir.getRoot(), "crash-0.log").exists());
+        assertFalse(new File(dir.getRoot(), "crash-1.log").exists());
+        assertTrue(unrelated.exists());
+    }
+}