Update RefUtilsTest.java

Add tests

Author: jweisman

modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/util/RefUtilsTest.java

@@ -298,6 +298,10 @@ public void testPathJoin1() {
     public void testPathJoin2() {
         assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "../newFile.yaml"), "http://foo.bar.com/my/newFile.yaml");
         assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "../../newFile.yaml"), "http://foo.bar.com/newFile.yaml");
+        assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "./newFile.yaml"), "http://foo.bar.com/my/dir/newFile.yaml");
+        assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "../second/newFile.yaml"), "http://foo.bar.com/my/second/newFile.yaml");
+        assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "../../otherDir/newFile.yaml"), "http://foo.bar.com/otherDir/newFile.yaml");
+        assertEquals(RefUtils.buildUrl("http://foo.bar.com/file.yaml", "./newFile.yaml"), "http://foo.bar.com/newFile.yaml");        
         assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "/newFile.yaml"), "http://foo.bar.com/newFile.yaml");
         assertEquals(RefUtils.buildUrl("http://foo.bar.com/my/dir/file.yaml", "/my/newFile.yaml"), "http://foo.bar.com/my/newFile.yaml");
     }