App 2.31.1: log the cruise control while driving, with every assist value

The 2.27.3 log wrote a line only when the target speed changed, so the
car showed one line at the start. Now a line is written on any change of
a mode or the target and every 2 s while driving, with the raw
driver-assistance properties (target speed, assist and speed-assist
modes, the followed object) and the reason for any unread value. The
last 600 lines are kept in an appended file; the Logs tab shows 150.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/src/test/java/com/evsuite/abrp/CruiseLogTest.java

@@ -1,18 +1,54 @@
 package com.evsuite.abrp;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
 
 import org.junit.Test;
 
-/** The cruise control log's value format — pure JVM. */
+/** The cruise control debug log's lines and when it writes one — pure JVM. */
 public class CruiseLogTest {
 
+    private static List<String[]> readings(String cc, String ica, String dist) {
+        return Arrays.asList(new String[] { "cc", cc }, new String[] { "ica", ica },
+                new String[] { "dist", dist });
+    }
+
     @Test
-    public void oneDecimalOrUnread() {
-        assertEquals("120.0", CruiseLog.format(120f));
-        assertEquals("33.3", CruiseLog.format(33.33f));
-        assertEquals("0.0", CruiseLog.format(0f));
-        assertEquals("unread", CruiseLog.format(null));
-        assertEquals("unread", CruiseLog.format(Float.NaN));
+    public void lineHasEveryValue() {
+        assertEquals("cc 120.00  ica 1  dist 35.20", CruiseLog.values(readings("120.00", "1", "35.20")));
+        assertEquals("cc unread (not available)  ica 0  dist unread",
+                CruiseLog.values(readings("unread (not available)", "0", "unread")));
+    }
+
+    @Test
+    public void followedObjectAloneIsNoChange() {
+        assertEquals(CruiseLog.steady(readings("120.00", "1", "35.20")),
+                CruiseLog.steady(readings("120.00", "1", "12.00")));
+        assertFalse(CruiseLog.steady(readings("120.00", "1", "1")).contains("dist"));
+    }
+
+    @Test
+    public void writesOnChangeAndEveryTwoSecondsWhileDriving() {
+        String a = CruiseLog.steady(readings("120.00", "1", "35"));
+        String b = CruiseLog.steady(readings("110.00", "1", "35"));
+        assertTrue(CruiseLog.due(a, null, 0, 0, false));
+        assertTrue(CruiseLog.due(b, a, 1000, 500, false));
+        assertFalse(CruiseLog.due(a, a, 1000, 500, true));
+        assertTrue(CruiseLog.due(a, a, 2500, 500, true));
+        // Parked: nothing new, nothing written.
+        assertFalse(CruiseLog.due(a, a, 60_000, 500, false));
+    }
+
+    @Test
+    public void drivingIsDOrROrMoving() {
+        assertTrue(CruiseLog.driving(null, 4));
+        assertTrue(CruiseLog.driving(0f, 2));
+        assertTrue(CruiseLog.driving(30f, 3));
+        assertFalse(CruiseLog.driving(0f, 1));
+        assertFalse(CruiseLog.driving(null, null));
     }
 }