Text import will automatically start sideboard after a single blank line. Added a JUnit test for TxtDeckImporter.

Mage.Tests/JustLands.txt

@@ -0,0 +1,6 @@
+1 Forest
+1 Plains
+1 Island
+
+1 Swamp
+1 Mountain

Mage.Tests/src/test/java/org/mage/test/decks/importer/TxtDeckImporterTest.java

@@ -0,0 +1,43 @@
+package org.mage.test.decks.importer;
+
+import mage.cards.decks.DeckCardInfo;
+import mage.cards.decks.DeckCardLists;
+import mage.cards.decks.importer.TxtDeckImporter;
+import mage.cards.repository.CardInfo;
+import mage.cards.repository.CardRepository;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TxtDeckImporterTest {
+
+    @Test
+    public void testImportWithBlankLineAboveSideboard() {
+        TxtDeckImporter importer = new TxtDeckImporter();
+
+        CardInfo card;
+        DeckCardLists deck = new DeckCardLists();
+
+        String[] cards = {"Plains", "Forest", "Island"};
+        String[] sideboard = {"Swamp", "Mountain"};
+
+        for (String c : cards) {
+            card = CardRepository.instance.findPreferedCoreExpansionCard(c, true);
+            assert card != null;
+            deck.getCards().add(new DeckCardInfo(card.getName(), card.getCardNumber(), card.getSetCode()));
+        }
+
+        for (String s : sideboard) {
+            card = CardRepository.instance.findPreferedCoreExpansionCard(s, true);
+            assert card != null;
+            deck.getSideboard().add(new DeckCardInfo(card.getName(), card.getCardNumber(), card.getSetCode()));
+        }
+
+        Assert.assertEquals("Deck does not contain 3 cards, found " + deck.getCards().size(), 3, deck.getCards().size());
+        Assert.assertEquals("Sideboard does not contain 2 cards, found " + deck.getSideboard().size(), 2, deck.getSideboard().size());
+
+        DeckCardLists imported = importer.importDeck("JustLands.txt");
+
+        Assert.assertEquals("Imported deck does not contain 3 cards, found " + imported.getCards().size(), 3, imported.getCards().size());
+        Assert.assertEquals("Imported sideboard does not contain 2 cards, found " + imported.getSideboard().size(), 2, imported.getSideboard().size());
+    }
+}

Mage/src/main/java/mage/cards/decks/importer/TxtDeckImporter.java

@@ -27,14 +27,15 @@
  */
 package mage.cards.decks.importer;
 
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.Set;
 import mage.cards.decks.DeckCardInfo;
 import mage.cards.decks.DeckCardLists;
 import mage.cards.repository.CardInfo;
 import mage.cards.repository.CardRepository;
 
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
 /**
  *
  * @author BetaSteward_at_googlemail.com
@@ -46,7 +47,7 @@ public class TxtDeckImporter extends DeckImporter {
     public static final Set<String> IGNORE_NAMES = new HashSet<>(Arrays.asList(SET_VALUES));
 
     private boolean sideboard = false;
-    private int emptyLinesInARow = 0;
+    private int nonEmptyLinesTotal = 0;
 
     @Override
     protected void readLine(String line, DeckCardLists deckList) {
@@ -57,14 +58,14 @@ public class TxtDeckImporter extends DeckImporter {
         if (line.startsWith("//")) {
             return;
         }
-        if (line.length() == 0) {
+
-            emptyLinesInARow++;
+        // Start the sideboard on empty line that follows
-            if (emptyLinesInARow > 1) {
+        // at least 1 non-empty line
-                sideboard = true;
+        if (line.length() == 0 && nonEmptyLinesTotal > 0) {
-            }
+            sideboard = true;
             return;
         } else {
-            emptyLinesInARow = 0;
+            nonEmptyLinesTotal++;
         }
 
         line = line.replace("\t", " "); // changing tabs to blanks as delimiter