chap02. tdd란?

src/main/java/chap02/Calculator.java

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+package chap02;
+
+public class Calculator {
+
+    public static int plus(int a1, int a2) {
+        return a1+a2;
+    }
+}

src/test/java/chap02/CalculatorTest.java

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+package chap02;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class CalculatorTest {
+
+    @Test
+    void plus(){
+        int result = Calculator.plus(1, 2);
+        assertEquals(3, result);
+        assertEquals(5, Calculator.plus(4,1));
+    }
+}

src/test/java/chap02/PasswordStrength.java

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+package chap02;
+
+public enum PasswordStrength {
+    NORMAL, STRONG
+}

src/test/java/chap02/PasswordStrengthMeter.java

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+package chap02;
+
+public class PasswordStrengthMeter {
+    public PasswordStrength meter(String s) {
+        if(s.length() < 8) return PasswordStrength.NORMAL;
+        return PasswordStrength.STRONG;
+    }
+}

src/test/java/chap02/PasswordStrengthMeterTest.java

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+package chap02;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class PasswordStrengthMeterTest {
+    @Test
+    void meetsAllCriteria_Then_Strong(){
+        PasswordStrengthMeter meter = new PasswordStrengthMeter();
+        PasswordStrength result = meter.meter("abcd!@AB");
+        assertEquals(PasswordStrength.STRONG, result);
+        PasswordStrength result2 = meter.meter("abcd!Add");
+        assertEquals(PasswordStrength.STRONG, result2);
+    }
+
+    @Test
+    void meetsOtherCriteria_except_for_Length_Then_Normal(){
+        PasswordStrengthMeter meter = new PasswordStrengthMeter();
+        PasswordStrength result = meter.meter("abcd!@A");
+        assertEquals(PasswordStrength.NORMAL, result);
+        PasswordStrength result2 = meter.meter("abcd!c");
+        assertEquals(PasswordStrength.NORMAL, result2);
+    }
+}