Fix large grid displays

game-of-life/src/main/java/fr/ippon/life/Grid.java

@@ -8,10 +8,12 @@ import java.util.stream.Stream;
 
 public class Grid {
 
+  private final Set<Cell> aliveCells;
   private final Set<Cell> deadCells;
   private final Box border;
 
   Grid(Set<Cell> aliveCells) {
+    this.aliveCells = aliveCells;
     this.deadCells = buildDeadCells(aliveCells);
     border = new Box(aliveCells);
   }
@@ -25,6 +27,10 @@ public class Grid {
       .collect(Collectors.toUnmodifiableSet());
   }
 
+  public boolean isAlive(Cell cell) {
+    return aliveCells.contains(cell);
+  }
+
   public Collection<Cell> deadCells() {
     return deadCells;
   }

game-of-life/src/main/java/fr/ippon/life/StringRenderer.java

@@ -33,16 +33,12 @@ public class StringRenderer implements Renderer<String> {
 
     private IntFunction<String> cellRepresentation(Integer row) {
       return column -> {
-        if (aliveCell(row, column)) {
+        if (grid.isAlive(new Cell(row, column))) {
           return "o";
         }
 
         return "x";
       };
     }
-
-    private boolean aliveCell(Integer row, int column) {
-      return !grid.deadCells().contains(new Cell(row, column));
-    }
   }
 }

game-of-life/src/test/java/fr/ippon/life/StringRendererUnitTest.java

@@ -22,6 +22,11 @@ class StringRendererUnitTest {
     assertThat(renderer.run(grid().alive(1, 1).alive(1, 3).build())).isEqualTo(join("xxxxx", "xoxox", "xxxxx"));
   }
 
+  @Test
+  void shouldDisplayGridWithTwoDistantAliveCell() {
+    assertThat(renderer.run(grid().alive(1, 1).alive(1, 7).build())).isEqualTo(join("xxxxxxxxx", "xoxxxxxox", "xxxxxxxxx"));
+  }
+
   private static String join(String... parts) {
     return Arrays.stream(parts).collect(Collectors.joining(System.lineSeparator(), "", System.lineSeparator()));
   }