Add oving 2

src/test/java/oving2/DigitTest.java

@@ -0,0 +1,75 @@
+package oving2;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+public class DigitTest {
+
+	private Digit digit;
+
+	private void testIncrement(int base, boolean checkValue, boolean checkToString) {
+		digit = new Digit(base);
+		int i = 0;
+		String digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+		while (i < base) {
+			if (checkValue) {
+				assertEquals(i % base, digit.getValue());
+			}
+			if (checkToString) {
+				assertEquals(String.valueOf(digits.charAt(i % base)),
+						digit.toString().toUpperCase());
+			}
+
+			boolean overflow = digit.increment();
+			i++;
+
+			if (checkValue) {
+				assertEquals(i % base == 0, overflow);
+				assertEquals(i % base, digit.getValue());
+			}
+			if (checkToString) {
+				assertEquals(String.valueOf(digits.charAt(i % base)),
+						digit.toString().toUpperCase());
+			}
+		}
+	}
+
+	private void testIncrement(boolean checkValue, boolean checkToString) {
+		for (int base = 2; base <= 16; base++) {
+			this.testIncrement(base, checkValue, checkToString);
+		}
+	}
+
+	@Test
+	@DisplayName("Private fields")
+	public void testPrivateFields() {
+		TestHelper.checkIfFieldsPrivate(Digit.class);
+	}
+
+	@Test
+	public void testDigit() {
+		digit = new Digit(10);
+		assertEquals(0, digit.getValue());
+		assertEquals(10, digit.getBase());
+
+		assertThrows(IllegalArgumentException.class, () -> {
+			digit = new Digit(-1);
+		}, "Should not be able to create digit with negative base");
+	}
+
+	@Test
+	@DisplayName("Digit should increment correctly")
+	public void testIncrement() {
+		this.testIncrement(true, false);
+	}
+
+	@Test
+	@DisplayName("Digit should be displayed by correct characters. For example 10 in base 16 "
+			+ "should be displayed as A")
+	public void testToString() {
+		this.testIncrement(false, true);
+	}
+}