[英]Junit - testing a different class
嗨,我正在努力让我了解Junit测试,我无法找到一种方法来测试另一个类而不将其部分粘贴到其中。说我想测试一下:
import java.io.*;
public class Calculator {
public static void main(String[] args) {
String s1 = getInput("Enter a numeric value: ");
String s2 = getInput("Enter a numeric value: ");
String op = getInput("Enter 1=ADD, 2=Subtract, 3=Multiply, 4=Divide ");
int opInt = Integer.parseInt(op);
double result = 0;
switch (opInt) {
case 1:
result = addValues(s1, s2);
break;
case 2:
result = subtractValues(s1, s2);
break;
case 3:
result = multiplyValues(s1, s2);
break;
case 4:
result = divideValues(s1, s2);
break;
default:
System.out.println("You entered an incorrect value");
return;
}
System.out.println("The answer is " + result);
}
private static double divideValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 / d2;
return result;
}
private static double multiplyValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 * d2;
return result;
}
private static double subtractValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 - d2;
return result;
}
private static double addValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 + d2;
return result;
}
private static String getInput(String prompt) {
BufferedReader stdin = new BufferedReader(
new InputStreamReader(System.in));
System.out.print(prompt);
System.out.flush();
try {
return stdin.readLine();
} catch (Exception e) {
return "error: " + e.getMessage();
}
}
有什么方法可以设置JUnit案例测试来检查其中的部分内容,而无需复制并粘贴到每个测试中或修改原始类。 我是否缺少某些东西,或者Junit无法做到?
这是我到目前为止的内容:
import static org.junit.Assert.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.junit.Test;
public class CalculatorTest {
Calculator mycalculator = new Calculator();
@Test
public void test1( ) {
mycalculator;
assertEquals(d1 + d2, 20);
}
}
您的班级设计并不能真正用于自动化测试。
尝试这样的事情:
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Calculator {
// TODO: Move enum to another file
public static enum OperatorType {
ADD,
SUBTRACT,
MULTIPLY,
DIVIDE
}
public double calculateResult(double operand1, double operand2, OperatorType operator) {
double result = 0;;
switch (operator) {
case ADD:
result = addValues(operand1, operand2);
break;
case DIVIDE:
result = subtractValues(operand1, operand2);
break;
case MULTIPLY:
result = multiplyValues(operand1, operand2);
break;
case SUBTRACT:
result = subtractValues(operand1, operand2);
break;
default:
break;
}
return result;
}
public double divideValues(double d1, double d2) {
double result;
if (d2 != 0) {
result = d1 / d2;
} else {
// Avoid divide-by-zero error (could also throw it if preferred)
result = 0;
}
return result;
}
public double multiplyValues(double d1, double d2) {
double result = d1 * d2;
return result;
}
public double subtractValues(double d1, double d2) {
double result = d1 - d2;
return result;
}
public double addValues(double d1, double d2) {
double result = d1 + d2;
return result;
}
public static void main(String[] args) {
// Get and validate user input
String s1 = getInput("Enter a numeric value: ");
String s2 = getInput("Enter a numeric value: ");
String op = getInput("Enter 1=ADD, 2=Subtract, 3=Multiply, 4=Divide ");
// TODO: Handle NumberFormatExceptions here
double operand1 = Double.parseDouble(s1);
double operand2 = Double.parseDouble(s2);
OperatorType operator;
int opInt = Integer.parseInt(op);
switch (opInt) {
case 1:
operator = OperatorType.ADD;
break;
case 2:
operator = OperatorType.SUBTRACT;
break;
case 3:
operator = OperatorType.MULTIPLY;
break;
case 4:
operator = OperatorType.DIVIDE;
break;
default:
System.out.println("You entered an incorrect value");
return;
}
// Use class to calculate result
Calculator calculator = new Calculator();
double result = calculator.calculateResult(operand1, operand2, operator);
// Output results
System.out.println("The answer is " + result);
}
private static String getInput(String prompt) {
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.print(prompt);
System.out.flush();
try {
return stdin.readLine();
} catch (Exception e) {
return "error: " + e.getMessage();
}
}
}
如果测试类在同一个程序包中(但在测试源中),则将范围限制为包将使您能够测试此类
public class Calculator {
public static void main(String[] args) {
String s1 = getInput("Enter a numeric value: ");
String s2 = getInput("Enter a numeric value: ");
String op = getInput("Enter 1=ADD, 2=Subtract, 3=Multiply, 4=Divide ");
new Calculator().calculate(s1, s2, op);
}
public void calculate(String s1, String s2, String op)
int opInt = Integer.parseInt(op);
double result = 0;
switch (opInt) {
case 1:
result = addValues(s1, s2);
break;
case 2:
result = subtractValues(s1, s2);
break;
case 3:
result = multiplyValues(s1, s2);
break;
case 4:
result = divideValues(s1, s2);
break;
default:
System.out.println("You entered an incorrect value");
return;
}
System.out.println("The answer is " + result);
}
double divideValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 / d2;
return result;
}
double multiplyValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 * d2;
return result;
}
double subtractValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 - d2;
return result;
}
double addValues(String s1, String s2) {
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
double result = d1 + d2;
return result;
}
String getInput(String prompt) {
BufferedReader stdin = new BufferedReader(
new InputStreamReader(System.in));
System.out.print(prompt);
System.out.flush();
try {
return stdin.readLine();
} catch (Exception e) {
return "error: " + e.getMessage();
}
}
在JUnit测试中,您可以在测试文件中包含类。 无需复制和粘贴类中的代码并将其放入测试文件中。 它看起来更像:
计算器c =新的Calculator();
c.myFunction();
您也可以在测试函数中添加断言语句,以确认从函数调用中获得正确的结果。
我仅使用Eclipse完成了JUnit测试,但实际上您创建了一个新的JUnit文件(就像对Class一样),并且该文件自动设置了文件的基本结构。 然后,您可以从那里添加所需的许多测试。 您也可以导入所需的任何类。
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