FileConventions: add another failing test

Add failing test for DetectUnpinnedNpmPackageInstallVersions
function.

Author: tehraninasab

src/FileConventions.Test/DummyFiles/DummyCIWithUnpinnedNpmPackageInstallVersion3.yml

@@ -0,0 +1,11 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  file-conventions:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install two npm packages, one with version and the other one without version
+        run: sudo npm install --save-dev @prettier/plugin-xml prettier@2.4.0

src/FileConventions.Test/FileConventions.Test.fs

@@ -202,6 +202,22 @@ let DetectUnpinnedNpmPackageInstallVersions3() =
     )
 
 
+[<Test>]
+let DetectUnpinnedNpmPackageInstallVersions4() =
+    let fileInfo =
+        (FileInfo(
+            Path.Combine(
+                dummyFilesDirectory.FullName,
+                "DummyCIWithUnpinnedNpmPackageInstallVersion3.yml"
+            )
+        ))
+
+    Assert.That(
+        DetectUnpinnedNpmPackageInstallVersions fileInfo,
+        Is.EqualTo true
+    )
+
+
 [<Test>]
 let DetectAsteriskInPackageReferenceItems1() =
     let fileInfo =