Fix relative IRIs containing a forward slash before a colon being incorrectly treated as absolute

.gitignore

@@ -1,4 +1,5 @@
 node_modules
+package-lock.json
 .idea
 lerna-debug.log
 yarn-error.log

lib/Resolve.ts

@@ -47,10 +47,15 @@ export function resolve(relativeIRI: string, baseIRI?: string): string {
     return removeDotSegmentsOfPath(relativeIRI, relativeColonPos);
   }
 
-  // Ignore baseIRI if the value is absolute
+  // Ignore baseIRI if the value is absolute.
+  // Per RFC 3986, a URI scheme cannot contain a '/', so if a '/' appears before the first ':',
+  // the IRI is a relative path (not an absolute IRI).
   const valueColonPos: number = relativeIRI.indexOf(':');
   if (valueColonPos >= 0) {
-    return removeDotSegmentsOfPath(relativeIRI, valueColonPos);
+    const valueSlashPos: number = relativeIRI.indexOf('/');
+    if (valueSlashPos < 0 || valueColonPos < valueSlashPos) {
+      return removeDotSegmentsOfPath(relativeIRI, valueColonPos);
+    }
   }
 
   // At this point, the baseIRI MUST be absolute, otherwise we error

test/Resolve-test.ts

@@ -441,6 +441,21 @@ describe('#resolve', () => {
     expect(resolve('../.../../../', 'http://example.org/a/b/c/'))
       .toEqual('http://example.org/a/');
   });
+
+  it('create an IRI from a relative IRI with a slash before a colon and a baseIRI with trailing slash', () => {
+    expect(resolve('x/y:z', 'http://base.org/path/'))
+      .toEqual('http://base.org/path/x/y:z');
+  });
+
+  it('create an IRI from a relative IRI with a slash before a colon and a baseIRI without trailing slash', () => {
+    expect(resolve('x/y:z', 'http://base.org/path'))
+      .toEqual('http://base.org/x/y:z');
+  });
+
+  it('create an IRI from a relative IRI with multiple colons after a slash', () => {
+    expect(resolve('x/y:z:w', 'http://base.org/path/'))
+      .toEqual('http://base.org/path/x/y:z:w');
+  });
 });
 
 describe('#removeDotSegments', () => {