diff --git a/java_console/models/src/main/java/com/rusefi/tracing/JsonOutput.java b/java_console/models/src/main/java/com/rusefi/tracing/JsonOutput.java
index 7042f61533..e75808d50e 100644
--- a/java_console/models/src/main/java/com/rusefi/tracing/JsonOutput.java
+++ b/java_console/models/src/main/java/com/rusefi/tracing/JsonOutput.java
@@ -2,8 +2,10 @@ package com.rusefi.tracing;
 
 import com.rusefi.PerfTraceTool;
 
-import java.io.*;
-import java.util.Arrays;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
 import java.util.List;
 
 /**
@@ -38,21 +40,7 @@ public class JsonOutput {
             "{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":60,\"tid\":0,\"args\":{\"name\":\"DMA2s4\"}}," +
             "{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":67,\"tid\":0,\"args\":{\"name\":\"USB\"}}"
             ;
-    private static final String EOL = "\r\n";
-
-    public static void main(String[] args) throws IOException {
-        /**
-         * that's just a test I assume?
-         */
-        List<Entry> testEntries = Arrays.asList(
-                new Entry("hello", Phase.B, 0.1, 0, 0),
-                new Entry("hello2", Phase.B, 0.2, 0, 0),
-                new Entry("hello2", Phase.E, 0.3, 0, 0),
-                new Entry("hello", Phase.E, 0.4, 0, 0)
-        );
-
-        writeToStream(testEntries, new FileOutputStream("hello_trace.json"));
-    }
+    private static final String EOL = "\n";
 
     public static void writeToStream(List<Entry> testEntries, OutputStream outputStream) throws IOException {
 
diff --git a/java_console/models/src/main/java/com/rusefi/tracing/test/PerfJsonOutputTest.java b/java_console/models/src/main/java/com/rusefi/tracing/test/PerfJsonOutputTest.java
new file mode 100644
index 0000000000..c1d7a6d02f
--- /dev/null
+++ b/java_console/models/src/main/java/com/rusefi/tracing/test/PerfJsonOutputTest.java
@@ -0,0 +1,38 @@
+package com.rusefi.tracing.test;
+
+import com.rusefi.tracing.Entry;
+import com.rusefi.tracing.JsonOutput;
+import com.rusefi.tracing.Phase;
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class PerfJsonOutputTest {
+    @Test
+    public void test() throws IOException {
+        List<Entry> testEntries = Arrays.asList(
+                new Entry("hello", Phase.B, 0.1, 0, 0),
+                new Entry("hello2", Phase.B, 0.2, 0, 0),
+                new Entry("hello2", Phase.E, 0.3, 0, 0),
+                new Entry("hello", Phase.E, 0.4, 0, 0)
+        );
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+        JsonOutput.writeToStream(testEntries, baos);
+
+        assertEquals("{\"traceEvents\": [\n" +
+                "{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":-16,\"tid\":0,\"args\":{\"name\":\"Main\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":-1,\"tid\":0,\"args\":{\"name\":\"SysTick\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":18,\"tid\":0,\"args\":{\"name\":\"ADC\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":19,\"tid\":0,\"args\":{\"name\":\"CAN1 TX\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":20,\"tid\":0,\"args\":{\"name\":\"CAN1 RX 0\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":21,\"tid\":0,\"args\":{\"name\":\"CAN1 RX 1\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":22,\"tid\":0,\"args\":{\"name\":\"CAN1 SCE\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":29,\"tid\":0,\"args\":{\"name\":\"TIM3\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":30,\"tid\":0,\"args\":{\"name\":\"TIM4\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":44,\"tid\":0,\"args\":{\"name\":\"TIM8/13\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":50,\"tid\":0,\"args\":{\"name\":\"TIM5\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":54,\"tid\":0,\"args\":{\"name\":\"TIM6\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":57,\"tid\":0,\"args\":{\"name\":\"DMA2s1\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":58,\"tid\":0,\"args\":{\"name\":\"DMA2s2\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":59,\"tid\":0,\"args\":{\"name\":\"DMA2s3\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":60,\"tid\":0,\"args\":{\"name\":\"DMA2s4\"}},{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":67,\"tid\":0,\"args\":{\"name\":\"USB\"}}\n" +
+                ",{\"name\":\"hello\",\"ph\":\"B\",\"tid\":0,\"pid\":0,\"ts\":0.1}\n" +
+                ",{\"name\":\"hello2\",\"ph\":\"B\",\"tid\":0,\"pid\":0,\"ts\":0.2}\n" +
+                ",{\"name\":\"hello2\",\"ph\":\"E\",\"tid\":0,\"pid\":0,\"ts\":0.3}\n" +
+                ",{\"name\":\"hello\",\"ph\":\"E\",\"tid\":0,\"pid\":0,\"ts\":0.4}\n" +
+                "]}", new String(baos.toByteArray()));
+
+    }
+}