FileConventions.Test: add failing test

Add failing test for detecting unpinned version in npm package
installations.

src/FileConventions.Test/DummyFiles/DummyCIWithUnpinnedNpmPackageInstallVersion.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 prettier without specifying its version
+        run: npm install prettier

src/FileConventions.Test/FileConventions.Test.fs

@@ -154,6 +154,22 @@ let DetectUnpinnedDotnetToolInstallVersions2() =
     )
 
 
+[<Test>]
+let DetectUnpinnedNpmPackageInstallVersions1() =
+    let fileInfo =
+        (FileInfo(
+            Path.Combine(
+                dummyFilesDirectory.FullName,
+                "DummyCIWithUnpinnedNpmPackageInstallVersion.yml"
+            )
+        ))
+
+    Assert.That(
+        DetectUnpinnedNpmPackageInstallVersions fileInfo,
+        Is.EqualTo true
+    )
+
+
 [<Test>]
 let DetectAsteriskInPackageReferenceItems1() =
     let fileInfo =

src/FileConventions/Library.fs

@@ -67,6 +67,10 @@ let DetectUnpinnedDotnetToolInstallVersions(fileInfo: FileInfo) =
 
     unpinnedDotnetToolInstallVersions
 
+let DetectUnpinnedNpmPackageInstallVersions(fileInfo: FileInfo) =
+    printfn "File Path: %s" fileInfo.FullName
+    false
+
 let DetectAsteriskInPackageReferenceItems(fileInfo: FileInfo) =
     assert (fileInfo.FullName.EndsWith "proj")
     use streamReader = new StreamReader(fileInfo.FullName)