fix: propertly create target file path for --file= with absolute path

src/lib/snyk-test/run-test.ts

@@ -671,7 +671,10 @@ async function assembleLocalPayloads(
 
       // Forcing options.path to be a string as pathUtil requires is to be stringified
       const targetFileRelativePath = targetFile
-        ? pathUtil.join(pathUtil.resolve(`${options.path || root}`), targetFile)
+        ? pathUtil.resolve(
+            pathUtil.resolve(`${options.path || root}`),
+            targetFile,
+          )
         : '';
 
       let targetFileDir;

test/fixtures/npm/with-vulnnerable-lodash-and-snyk-file/.snyk

@@ -0,0 +1,10 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.22.1
+# ignores vulnerabilities until expiry date; change duration by modifying expiry date
+ignore:
+  SNYK-JS-LODASH-590103:
+    - '*':
+        reason: None Given
+        expires: 2021-11-21T21:55:08.466Z
+        created: 2021-10-22T21:55:08.469Z
+patch: {}

test/fixtures/npm/with-vulnnerable-lodash-and-snyk-file/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "with-vulnerable-lodash-dep",
+  "version": "1.2.3",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "license": "ISC",
+  "dependencies": {
+    "lodash": "4.17.15"
+  }
+}