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[英]Is there a way for a JUnit test to pass iff method implementation is correct AND recursive?
[英]Recursive JUnit Test
因此,我正在嘗試編寫 3 個測試用例來查找我編寫的遞歸方法是否正確。 我對 JUnit 不太好,但這就是我到目前為止所得到的。
如何證明我的遞歸方法在 JUnit 中是正確的(如果是)?
這是我的班級:
public class Rhino {
private String co; //The country in which this Rhino was born. Not null
private Rhino parent; //null if this Rhino has no known parent
/** Constructor : an instance born in country c with parent p.
* Precondition : c is not null . */
public Rhino(String c, Rhino p) {
co = c;
parent = p;
}
/** Return the number of Rhinos in this Rhino 's family that
were
* born in country c. This Rhino 's family consists of this
Rhino , its
* parent , its parent 's parent , its parent 's parent 's parent ,
etc . */
public int numCountry(String c) {
if (parent == null){return co.equals(c) ? 1:0;}
return(co.equals(c) ? 1:0) + parent.numCountry(c);
}
}
到目前為止,這是我的 JUnit 測試:
import static org.junit.Assert.assertEquals;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
class RhinoTest {
@Test
public void testCountry() {
Rhino testCP = new Rhino("USA", null);
assertEquals("USA", testCP.numCountry(""));
assertNotEquals(testCP, null);
}
}
試試這個基本測試,讓你開始:
public void testCountry() {
Rhino rA = new Rhino("USA", null);
Rhino rB = new Rhino("USA", rA);
Rhino rC = new Rhino("CANADA", rB);
Rhino rD = new Rhino("USA", rC);
int expectedResult = 3;
assertEquals(expectedResult, rD.numCountry("USA"));
}
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