Adding method to TrustDomain and test

Signed-off-by: Max Lambrecht <maxlambrecht@gmail.com>

java-spiffe-core/src/main/java/spiffe/spiffeid/TrustDomain.java

@@ -50,6 +50,10 @@ public class TrustDomain {
         return new TrustDomain(host);
     }
 
+    public SpiffeId newSpiffeId(String ...path) {
+        return SpiffeId.of(this, path);
+    }
+
     private static void validateHost(String host) {
         if (StringUtils.isBlank(host)) {
             throw new IllegalArgumentException("Trust domain cannot be empty");

java-spiffe-core/src/test/java/spiffe/spiffeid/TrustDomainTest.java

@@ -1,5 +1,6 @@
 package spiffe.spiffeid;
 
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -31,7 +32,7 @@ public class TrustDomainTest {
 
     @ParameterizedTest
     @MethodSource("provideTestTrustDomain")
-    void parseAddressInvalid(String input, Object expected) {
+    void parseTrustDomain(String input, Object expected) {
         TrustDomain result = null;
         try {
             result = TrustDomain.of(input);
@@ -40,4 +41,13 @@ public class TrustDomainTest {
             assertEquals(expected, e.getMessage());
         }
     }
+
+    @Test
+    void newSpiffeId() {
+        TrustDomain trustDomain = TrustDomain.of("test.domain");
+        SpiffeId spiffeId = trustDomain.newSpiffeId("path1", "host");
+
+        assertEquals(trustDomain, spiffeId.getTrustDomain());
+        assertEquals("/path1/host", spiffeId.getPath());
+    }
 }

java-spiffe-core/src/test/java/spiffe/workloadapi/AddressTest.java

@@ -14,7 +14,7 @@ public class AddressTest {
 
     @ParameterizedTest
     @MethodSource("provideTestAddress")
-    void parseAddressInvalid(String input, Object expected) {
+    void parseAddress(String input, Object expected) {
         URI result = null;
         try {
             result = Address.parseAddress(input);