Add test data

Author: dwalluck

src/main/java/com/github/packageurl/PackageURL.java

@@ -412,7 +412,7 @@ private String validateSubpath(final String value) throws MalformedPackageURLExc
         return validatePath(value.split("/"), true);
     }
 
-    private static boolean shouldKeepSegment(String segment, boolean isSubpath) {
+    private static boolean shouldKeepSegment(final String segment, final boolean isSubpath) {
         return (!isSubpath || (!segment.isEmpty() && !".".equals(segment) && !"..".equals(segment)));
     }
 

src/test/resources/test-suite-data.json

@@ -47,6 +47,30 @@
     "subpath": "googleapis/api/annotations",
     "is_invalid": false
   },
+  {
+    "description": "invalid subpath - unencoded subpath cannot contain '..'",
+    "purl": "pkg:GOLANG/google.golang.org/genproto@abcdedf#/googleapis/%2E%2E/api/annotations/",
+    "canonical_purl": "pkg:golang/google.golang.org/genproto@abcdedf#googleapis/api/annotations",
+    "type": "golang",
+    "namespace": "google.golang.org",
+    "name": "genproto",
+    "version": "abcdedf",
+    "qualifiers": null,
+    "subpath": "googleapis/api/annotations",
+    "is_invalid": false
+  },
+  {
+    "description": "invalid subpath - unencoded subpath cannot contain '.'",
+    "purl": "pkg:GOLANG/google.golang.org/genproto@abcdedf#/googleapis/%2E/api/annotations/",
+    "canonical_purl": "pkg:golang/google.golang.org/genproto@abcdedf#googleapis/api/annotations",
+    "type": "golang",
+    "namespace": "google.golang.org",
+    "name": "genproto",
+    "version": "abcdedf",
+    "qualifiers": null,
+    "subpath": "googleapis/api/annotations",
+    "is_invalid": false
+  },
   {
     "description": "bitbucket namespace and name should be lowercased",
     "purl": "pkg:bitbucket/birKenfeld/pyGments-main@244fd47e07d1014f0aed9c",