Add tests for import sorting

src-literatetests/10-tests.blt

@@ -1294,6 +1294,29 @@ import qualified Data.List                               as L
 -- Test
 import           Test                                     ( test )
 
+#test sorted-imports
+import           Aaa
+import           Baa
+
+#test sorted-import-groups
+import           Zaa
+import           Zab
+<BLANKLINE>
+import           Aaa
+import           Baa
+
+#test sorted-qualified-imports
+import           Boo
+import qualified Zoo
+
+#test imports-groups-same-module
+import           Boo                                      ( a )
+<BLANKLINE>
+import           Boo                                      ( b )
+
+#test sorted-imports-nested
+import           A.B.C
+import           A.B.D
 
 ###############################################################################
 ###############################################################################

src-literatetests/Main.hs

@@ -159,6 +159,10 @@ main = do
           (Parsec.noneOf "\r\n")
         , _ <- Parsec.eof
         ]
+      , [ NormalLine mempty
+        | _ <- Parsec.try $ Parsec.string "<BLANKLINE>"
+        , _ <- Parsec.eof
+        ]
       ]
     lineMapper :: Text -> InputLine
     lineMapper line = case Parsec.runParser specialLineParser () "" line of