Add tests on header to anchor conversion

package.yaml

@@ -90,3 +90,12 @@ executables:
     - -O2
     dependencies:
     - crossref-verifier
+
+tests:
+  crossref-verifier-tests:
+    main:                Main.hs
+    source-dirs:         tests
+    dependencies:
+    - crossref-verifier
+    - hspec
+    - QuickCheck

tests/Main.hs

@@ -0,0 +1,5 @@
+import Spec (spec)
+import Test.Hspec (hspec)
+
+main :: IO ()
+main = hspec spec

tests/Spec.hs

@@ -0,0 +1 @@
+{-# OPTIONS_GHC -F -pgmF hspec-discover -optF --module-name=Spec #-}

tests/Test/Crv/AnchorsSpec.hs

@@ -0,0 +1,14 @@
+module Test.Crv.AnchorsSpec where
+
+import Test.Hspec (Spec, it)
+import Test.QuickCheck (conjoin, (===))
+
+import Crv.Core (headerToAnchor)
+
+spec :: Spec
+spec = do
+    it "Header-to-anchor conversion" $
+        conjoin $ map (\(a, b) -> headerToAnchor a === b) $
+        [
+
+        ]