feat(ci): add java 17/21/25 matrix and microservice smoke tests

Author: OrionTheProgrammer

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    name: Test (Java ${{ matrix.java }} / ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        java: [17, 21, 25]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+          cache: maven
+
+      - name: Run tests
+        run: mvn -B -ntp clean test
+
+  release-readiness:
+    name: Release Readiness
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: maven
+
+      - name: Verify central release profile
+        run: mvn -B -ntp -Pcentral-release -Dgpg.skip=true -DskipTests=true verify

bpj-starter-smoke/src/main/java/io/github/bpj/smoke/CheckoutService.java

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+package io.github.bpj.smoke;
+
+import io.github.bpj.BPJ;
+
+public final class CheckoutService {
+
+    public String buildOrderSummary(Customer customer, Product product, int quantity) {
+        int subtotal = product.unitPrice() * quantity;
+        int total = subtotal;
+        return BPJ.format("Pedido de {customer.name}: {quantity} x {product.name} = {subtotal}. Total {total}");
+    }
+}

bpj-starter-smoke/src/main/java/io/github/bpj/smoke/Customer.java

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+package io.github.bpj.smoke;
+
+public record Customer(String name) {
+}

bpj-starter-smoke/src/main/java/io/github/bpj/smoke/Product.java

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+package io.github.bpj.smoke;
+
+public record Product(String name, int unitPrice) {
+}

bpj-starter-smoke/src/main/java/io/github/bpj/smoke/WelcomeNotifier.java

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+package io.github.bpj.smoke;
+
+import io.github.bpj.BPJ;
+
+public final class WelcomeNotifier {
+
+    public void printWelcome(Customer customer) {
+        BPJ.println("Bienvenido {customer.name}");
+    }
+}

bpj-starter-smoke/src/test/java/io/github/bpj/smoke/CheckoutServiceTest.java

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+package io.github.bpj.smoke;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class CheckoutServiceTest {
+
+    @Test
+    void shouldInterpolateMicroserviceStyleSummaryWithoutManualContext() {
+        CheckoutService service = new CheckoutService();
+        Customer customer = new Customer("Orion");
+        Product product = new Product("Keyboard", 15);
+
+        String output = service.buildOrderSummary(customer, product, 3);
+
+        assertEquals("Pedido de Orion: 3 x Keyboard = 45. Total 45", output);
+    }
+}

bpj-starter-smoke/src/test/java/io/github/bpj/smoke/WelcomeNotifierTest.java

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+package io.github.bpj.smoke;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+import org.junit.jupiter.api.Test;
+
+class WelcomeNotifierTest {
+
+    @Test
+    void shouldPrintResolvedPlaceholderWithoutManualContext() throws Exception {
+        WelcomeNotifier notifier = new WelcomeNotifier();
+        PrintStream originalOut = System.out;
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+        try (PrintStream capture = new PrintStream(out, true, StandardCharsets.UTF_8)) {
+            System.setOut(capture);
+            notifier.printWelcome(new Customer("Pablo"));
+        } finally {
+            System.setOut(originalOut);
+        }
+
+        assertEquals("Bienvenido Pablo" + System.lineSeparator(), out.toString(StandardCharsets.UTF_8));
+    }
+}