fix: add percent-encoded plus sign in purl version tests (#4939)

test/jest/unit/snyk-dep-graph.spec.ts

@@ -0,0 +1,59 @@
+import { createFromJSON } from '@snyk/dep-graph';
+
+describe('@snyk/dep-graph', () => {
+  describe('createFromJSON', () => {
+    it('supports percent-encoded plus sign in purl version', () => {
+      // Arrange
+      const json = {
+        schemaVersion: '1.3.0',
+        pkgManager: {
+          name: 'deb',
+          repositories: [
+            {
+              alias: 'repository:tag',
+            },
+          ],
+        },
+        pkgs: [
+          {
+            id: 'repository@digest',
+            info: {
+              name: 'repository',
+              version: 'digest',
+            },
+          },
+          {
+            id: 'db5.3/libdb5.3@5.3.28+dfsg1-0.6ubuntu2',
+            info: {
+              name: 'db5.3/libdb5.3',
+              version: '5.3.28+dfsg1-0.6ubuntu2',
+              purl: 'pkg:deb/libdb5.3@5.3.28%2Bdfsg1-0.6ubuntu2?upstream=db5.3',
+            },
+          },
+        ],
+        graph: {
+          rootNodeId: 'root-node',
+          nodes: [
+            {
+              nodeId: 'root-node',
+              pkgId: 'repository@digest',
+              deps: [
+                {
+                  nodeId: 'db5.3/libdb5.3@5.3.28+dfsg1-0.6ubuntu2',
+                },
+              ],
+            },
+            {
+              nodeId: 'db5.3/libdb5.3@5.3.28+dfsg1-0.6ubuntu2',
+              pkgId: 'db5.3/libdb5.3@5.3.28+dfsg1-0.6ubuntu2',
+              deps: [],
+            },
+          ],
+        },
+      };
+
+      // Act
+      createFromJSON(json);
+    });
+  });
+});