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Fix flaky Android screenshot tests by throttling logcat output #4253

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Merged
shai-almog merged 2 commits into from
Dec 14, 2025
Merged

Fix flaky Android screenshot tests by throttling logcat output #4253

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d80685b
Prevent logcat truncation during screenshot emission
google-labs-jules[bot] Dec 14, 2025
6b32321
Fix iOS regression in screenshot processing
google-labs-jules[bot] Dec 14, 2025
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20 changes: 17 additions & 3 deletions ...rc/main/java/com/codenameone/examples/hellocodenameone/tests/Cn1ssDeviceRunnerHelper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,9 @@
import java.io.IOException;

final class Cn1ssDeviceRunnerHelper {
private static final int CHUNK_SIZE = 900;
private static final int CHUNK_SIZE_ANDROID = 500;
private static final int CHUNK_SIZE_DEFAULT = 900;
private static final int DELAY_ANDROID = 20;
private static final int MAX_PREVIEW_BYTES = 20 * 1024;
private static final String PREVIEW_CHANNEL = "PREVIEW";
private static final int[] PREVIEW_QUALITIES = new int[] {60, 50, 40, 35, 30, 25, 20, 18, 16, 14, 12, 10, 8, 6, 5, 4, 3, 2, 1};
Expand Down Expand Up @@ -124,13 +126,25 @@ private static void emitChannel(byte[] bytes, String safeName, String channel) {
}
String base64 = Base64.encodeNoNewline(bytes);
int count = 0;
for (int pos = 0; pos < base64.length(); pos += CHUNK_SIZE) {
int end = Math.min(pos + CHUNK_SIZE, base64.length());

boolean isAndroid = "and".equals(Display.getInstance().getPlatformName());
int chunkSize = isAndroid ? CHUNK_SIZE_ANDROID : CHUNK_SIZE_DEFAULT;
int delay = isAndroid ? DELAY_ANDROID : 0;

for (int pos = 0; pos < base64.length(); pos += chunkSize) {
int end = Math.min(pos + chunkSize, base64.length());
String chunk = base64.substring(pos, end);
println(prefix + ":" + safeName + ":" + zeroPad(pos, 6) + ":" + chunk);
count++;
// Slow down to prevent logcat buffer overflow/truncation
if (delay > 0) {
Util.sleep(delay);
}
}
println("CN1SS:INFO:test=" + safeName + " chunks=" + count + " total_b64_len=" + base64.length());
if (delay > 0) {
Util.sleep(50);
}
println(prefix + ":END:" + safeName);
System.out.flush();
}
Expand Down
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