Merge pull request 'PaymentService 정책 기반 전환' (#1) from forge/BAIS-POLICY-1783705261-attempt-3 into main

.forge/BAIS-POLICY-1783705261-attempt-3.md

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+# BAIS-POLICY-1783705261-attempt-3
+
+Forge 이슈 작업 브랜치 `forge/BAIS-POLICY-1783705261-attempt-3`.

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.example.baispolicy</groupId>
+    <artifactId>bais-policy</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.5.14</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/example/baispolicy/PaymentService.java

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+package com.example.baispolicy;
+
+public class PaymentService {
+    public String approve(String transactionId) {
+        if (transactionId == null || transactionId.isBlank()) {
+            throw new IllegalArgumentException("Transaction ID must not be blank.");
+        }
+        return "APPROVED:" + transactionId;
+    }
+}

src/test/java/com/example/baispolicy/PaymentServiceTest.java

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+package com.example.baispolicy;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class PaymentServiceTest {
+    private final PaymentService paymentService = new PaymentService();
+
+    @Test
+    void testApprove_WithValidTransactionId_ShouldReturnApprovedMessage() {
+        String transactionId = "12345";
+        String result = paymentService.approve(transactionId);
+        assertEquals("APPROVED:12345", result);
+    }
+
+    @Test
+    void testApprove_WithBlankTransactionId_ShouldThrowException() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            paymentService.approve("");
+        });
+        assertThrows(IllegalArgumentException.class, () -> {
+            paymentService.approve(null);
+        });
+    }
+}