test(lotw): VUCC up to 4 grids in one contact; clarify comment

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/LoTWRepository.kt

@@ -194,8 +194,9 @@ class LoTWRepository : ILoTWRepository {
                 line.startsWith("<BAND:") && !line.startsWith("<BAND_RX:") ->
                     bandDown = adifValue(line).uppercase()
                 line.startsWith("<GRIDSQUARE:") || line.startsWith("<VUCC_GRIDS:") -> {
-                    // VUCC_GRIDS holds a comma-separated PAIR of grids
+                    // VUCC_GRIDS holds a comma-separated list of grids
-                    // ("EN52en,EN53fa"); split and keep every 4-char field.
+                    // ("EN52en,EN53fa"), up to four for contacts spanning
+                    // several squares; split and keep every 4-char field.
                     adifValue(line).split(',').forEach { grid ->
                         val field = grid.trim().uppercase()
                         if (field.length >= 4) gridsInRecord.add(field.take(4))

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/LoTWRepositoryTest.kt

@@ -111,6 +111,17 @@ class LoTWRepositoryTest {
         assertEquals(result["EN52"]!!.first(), result["EN53"]!!.first())
     }
 
+    @Test
+    fun parseQsosVuccQuadrupleFeedsAllFourGrids() {
+        // VUCC allows up to four grids in one contact.
+        val qso = "<PROP_MODE:3>SAT\n<SAT_NAME:5>SO-50\n" +
+            "<QSO_DATE:8>20260819\n<TIME_ON:4>1231\n" +
+            "<VUCC_GRIDS:23>EN52en,EN53fa,EN42gj,EN43kh\n<EOR>\n"
+        val result = repo.parseConfirmedGridQsos(report(qso))!!
+        assertEquals(setOf("EN52", "EN53", "EN42", "EN43"), result.keys)
+        result.values.forEach { assertEquals(1, it.size) }
+    }
+
     @Test
     fun parseQsosRejectsBodyWithoutEoh() {
         assertNull(repo.parseConfirmedGridQsos("<HTML>Username/password incorrect</HTML>"))