Minimal project to verify excluded protocols in SslContextFactory

Refs jetty/jetty.project#5531

.github/workflows/build.yml

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+name: Build
+on: push
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: ['8', '11', '15']
+        os: ['ubuntu-latest','macos-latest','windows-latest']
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK
+      uses: actions/setup-java@v1.4.3
+      with:
+        java-version: ${{ matrix.java_version }}
+    - name: Build
+      run: mvn -B -V -ntp verify

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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.github.joschi</groupId>
+    <artifactId>jetty-5531</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <url>https://github.com/eclipse/jetty.project/issues/5531</url>
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.eclipse.jetty</groupId>
+            <artifactId>jetty-util</artifactId>
+            <version>9.4.33.v20201020</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.7.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.18.0</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.8.1</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-surefire-plugin</artifactId>
+                    <version>2.22.2</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>

src/test/java/SslContextFactoryTest.java

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+import org.eclipse.jetty.util.ssl.SslContextFactory;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class SslContextFactoryTest {
+    @Test
+    public void testDumpExcludedProtocols() throws Exception {
+        SslContextFactory.Server cf = new SslContextFactory.Server();
+        cf.setKeyStorePassword("storepwd");
+        cf.setKeyManagerPassword("keypwd");
+        cf.setExcludeProtocols("SSL.*", "TLSv1", "TLSv1\\.[01]");
+        cf.start();
+
+        // Confirm behavior in engine
+        String[] enabledProtocols = cf.newSSLEngine().getEnabledProtocols();
+        assertThat(enabledProtocols).doesNotContain("TLSv1.1");
+    }
+}