Java 學習記錄108 — Parameterized Testing

今天要學的是把測試方法加上參數的應用

BankAccountTestParameterized.java

package bankAcoount;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.util.Arrays;
import java.util.Collection;
import static org.junit.Assert.assertEquals;
@RunWith(Parameterized.class)
public class BankAccountTestParameterized {
    private BankAccount account;
    private double amount;
    private  boolean branch;
    private double expected;
    public BankAccountTestParameterized(double amount, boolean branch, double expected) {
        this.amount = amount;
        this.branch = branch;
        this.expected = expected;
    }
    @Before
    public void setup() {
        account = new BankAccount("Tim", "Jimmy", 1000.00, BankAccount.CHECKING);
        System.out.println("Running a test...");
    }
    @Parameterized.Parameters
    public static Collection<Object[]> testConditions() {
        return Arrays.asList(new Object[][]{
                {100.00, true, 1100.00},
                {200.00, true, 1200.00},
                {325.14, true, 1325.14},
                {489.33, true, 1489.33},
                {1000.00, true, 2000.00},
        });
    }
    @Test
    public void getBalance_deposit() {
        account.deposit(amount, branch);
        assertEquals(expected, account.getBalance(), 0);
    }
}

測試結果：

Running a test…

Running a test…

Running a test…

java.lang.AssertionError:

Expected :1325.14

Actual :1325.1399999999999

<Click to see difference>

at org.junit.Assert.fail(Assert.java:89)

at org.junit.Assert.failNotEquals(Assert.java:835)

Running a test…

Running a test…

看起來複雜了一些，但其實還好

我們設定的參數就在 testConditions() 裡面

其他就是 filed 跟 construcetor

還有 setup() （每個測試案例都會運行一次）

這些測試數據傳給測試案例 getBalance_deposit()

裡面報了一個錯，因為 double 的關係，有時候會有這個誤差

修正的方法也很簡單

@Test
public void getBalance_deposit() {
    account.deposit(amount, branch);
    assertEquals(expected, account.getBalance(), 0.1);
}

把 assertEquals() 第三個參數 delta 增加一點就好

只要符合這個誤差值內就算通過

測試結果：

全部通過

上面代碼全都紀錄在我的 Github