import static org.junit.jupiter.api.Assertions.*; import org.junit.jupiter.api.BeforeEach; import org.junit.jupiter.api.Test; /** * Tests Grid class * @author * @author */ public class GridTest { /** Grid for testing */ private Grid grid; /** * Creates Grid for testing */ @BeforeEach public void setUp() { grid = new Grid(2, 3); } /** Test setSymbol and getSymbol */ @Test public void testSetAndGetSymbol() { grid.setSymbol(0, 2, new Symbol("horse", 8)); assertEquals(new Symbol("horse", 8), grid.getSymbol(0, 2), "setSymbol then getSymbol"); } /** Test toString */ @Test public void testToString() { grid.setSymbol(0, 0, new Symbol("ant", 10)); grid.setSymbol(0, 1, new Symbol("bat", 20)); grid.setSymbol(0, 2, new Symbol("cat", 30)); grid.setSymbol(1, 0, new Symbol("dog", 40)); grid.setSymbol(1, 1, new Symbol("elephant", 50)); grid.setSymbol(1, 2, new Symbol("frog", 60)); String expected = "ant bat cat dog elephant frog "; assertEquals(expected, grid.toString(), "Test toString after constructed"); } /** * Tests exceptions */ @Test public void testExceptions() { // Testing constructor with 0 rows Exception exception = assertThrows(IllegalArgumentException.class, () -> new Grid(0, 2), "Constructor 0 rows"); assertEquals("Invalid rows/cols", exception.getMessage(), "Testing constructor Invalid rows/cols message with 0 rows"); // Testing constructor with negative cols exception = assertThrows(IllegalArgumentException.class, () -> new Grid(3, -4), "Constructor negative cols"); assertEquals("Invalid rows/cols", exception.getMessage(), "Testing constructor Invalid rows/cols message with negative cols"); // Testing setSymbol with null symbol exception = assertThrows(IllegalArgumentException.class, () -> grid.setSymbol(1, 1, null), "setSymbol with null symbol"); assertEquals("Null symbol", exception.getMessage(), "Testing setSymbol Null symbol message"); // Testing setSymbol with row too large exception = assertThrows(IllegalArgumentException.class, () -> grid.setSymbol(2, 1, new Symbol("monkey", 20)), "setSymbol with row too large"); assertEquals("Invalid row", exception.getMessage(), "Testing setSymbol Invalid row message with row too large"); // Testing setSymbol with negative row exception = assertThrows(IllegalArgumentException.class, () -> grid.setSymbol(-1, 1, new Symbol("monkey", 20)), "setSymbol with negative row"); assertEquals("Invalid row", exception.getMessage(), "Testing setSymbol Invalid row message with negative row"); // Testing setSymbol with col too large exception = assertThrows(IllegalArgumentException.class, () -> grid.setSymbol(1, 3, new Symbol("elephant", 45)), "setSymbol with col too large"); assertEquals("Invalid col", exception.getMessage(), "Testing setSymbol Invalid col message with col too large"); // Testing setSymbol with negative col exception = assertThrows(IllegalArgumentException.class, () -> grid.setSymbol(0, -1, new Symbol("elephant", 45)), "setSymbol with negative col"); assertEquals("Invalid col", exception.getMessage(), "Testing setSymbol Invalid col message with negative col"); // Testing getSymbol with row too large exception = assertThrows(IllegalArgumentException.class, () -> grid.getSymbol(2, 1), "getSymbol with row too large"); assertEquals("Invalid row", exception.getMessage(), "Testing getSymbol Invalid row message with row too large"); // Testing getSymbol with negative row exception = assertThrows(IllegalArgumentException.class, () -> grid.getSymbol(-1, 1), "getSymbol with negative row"); assertEquals("Invalid row", exception.getMessage(), "Testing getSymbol Invalid row message with negative row"); // Testing getSymbol with col too large exception = assertThrows(IllegalArgumentException.class, () -> grid.getSymbol(1, 3), "getSymbol with col too large"); assertEquals("Invalid col", exception.getMessage(), "Testing getSymbol Invalid col message with col too large"); // Testing getSymbol with negative col exception = assertThrows(IllegalArgumentException.class, () -> grid.getSymbol(1, -1), "getSymbol with negative col"); assertEquals("Invalid col", exception.getMessage(), "Testing getSymbol Invalid col message with negative col"); } }

public class Grid { private int rows; private int cols; private Symbol symbols[][]; public Grid(int rows, int cols) { if (rows < 1 || cols < 1) { throw new IllegalArgumentException("Invalid rows/cols"); } this.rows = rows; this.cols = cols; symbols = new Symbol[rows][cols]; } public int getRows() { return rows; } public int getCols() { return cols; } public void setSymbol(int row, int col, Symbol symbol) { if (symbol == null) { throw new IllegalArgumentException("Null symbol"); } if (row < 0 || row >= rows) { throw new IllegalArgumentException("Invalid row"); } if (col < 0 || col >= cols) { throw new IllegalArgumentException("Invalid col"); } symbols[row][col] = symbol; } public Symbol getSymbol(int row, int col) { if (row < 0 || row >= rows) { throw new IllegalArgumentException("Invalid row"); } if (col < 0 || col >= cols) { throw new IllegalArgumentException("Invalid col"); } return symbols[row][col]; } public String toString() { StringBuilder sb = new StringBuilder(); for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { sb.append(symbols[i][j].getName() + " "); } sb.append(" "); } return sb.toString(); } }