diff --git a/test/HashSetUtilsSpec.hs b/test/HashSetUtilsSpec.hs
new file mode 100644
index 0000000..545bd74
--- /dev/null
+++ b/test/HashSetUtilsSpec.hs
@@ -0,0 +1,23 @@
+module HashSetUtilsSpec (hashSetTestCases) where
+
+import qualified Data.HashMap.Strict as HM
+import Data.HashSet
+import HashSetUtils
+import Test.HUnit
+
+testMaybeNesEmptyHashSet :: Test
+testMaybeNesEmptyHashSet = TestCase $ assertEqual "maybeNes empty HashSet" Nothing (maybeNes (empty :: HashSet Int))
+
+testMaybeNesNonEmptyHashSet :: Test
+testMaybeNesNonEmptyHashSet = TestCase $ assertEqual "maybeNes non-empty HashSet" (Just $ (fromList [1, 2, 3] :: HashSet Int)) (maybeNes $ fromList [1, 2, 3])
+
+fromHashMapTest :: Test
+fromHashMapTest = TestCase $ assertEqual "fromHashMap" (fromList [(1, "a"), (2, "b"), (3, "c")] :: HashSet (Int, String)) (fromHashMap $ HM.fromList [(1, "a"), (2, "b"), (3, "c")])
+
+hashSetTestCases :: Test
+hashSetTestCases =
+  TestList
+    [ testMaybeNesEmptyHashSet,
+      testMaybeNesNonEmptyHashSet,
+      fromHashMapTest
+    ]
\ No newline at end of file
diff --git a/test/SequenceUtilsSpec.hs b/test/SequenceUtilsSpec.hs
new file mode 100644
index 0000000..e4018fe
--- /dev/null
+++ b/test/SequenceUtilsSpec.hs
@@ -0,0 +1,34 @@
+module SequenceUtilsSpec (seqTestCases) where
+
+import Data.Sequence
+import SequenceUtils
+import Test.HUnit
+
+testMaybeNesEmptySequence :: Test
+testMaybeNesEmptySequence = TestCase $ assertEqual "maybeNes empty sequence" Nothing (maybeNes (empty :: Seq Int))
+
+testMaybeNesNonEmptySequence :: Test
+testMaybeNesNonEmptySequence = TestCase $ assertEqual "maybeNes non-empty sequence" (Just $ fromList [1, 2, 3]) (maybeNes $ fromList [1, 2, 3])
+
+testUniqEmptySequence :: Test
+testUniqEmptySequence = TestCase $ assertEqual "uniq empty sequence" (empty :: Seq Int) (uniq (empty :: Seq Int))
+
+testUniqNonEmptySequence :: Test
+testUniqNonEmptySequence = TestCase $ assertEqual "uniq non-empty sequence" (fromList [1, 2, 3]) (uniq $ fromList [1, 2, 2, 3])
+
+testMapMaybeEmptySequence :: Test
+testMapMaybeEmptySequence = TestCase $ assertEqual "mapMaybe empty sequence" (empty :: Seq Int) (mapMaybe (const Nothing) (empty :: Seq Int))
+
+testMapMaybeNonEmptySequence :: Test
+testMapMaybeNonEmptySequence = TestCase $ assertEqual "mapMaybe non-empty sequence" (fromList [1, 3]) (mapMaybe (\x -> if x == 2 then Nothing else Just x) $ fromList [1, 2, 3])
+
+seqTestCases :: Test
+seqTestCases =
+  TestList
+    [ testMaybeNesEmptySequence,
+      testMaybeNesNonEmptySequence,
+      testUniqEmptySequence,
+      testUniqNonEmptySequence,
+      testMapMaybeEmptySequence,
+      testMapMaybeNonEmptySequence
+    ]
\ No newline at end of file
diff --git a/test/Spec.hs b/test/Spec.hs
index 4e50657..46da303 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -1,4 +1,17 @@
+import HashSetUtilsSpec
+import SequenceUtilsSpec
 import Test.HUnit
+import System.Exit (exitFailure)
+
+processCounts :: Counts -> IO ()
+processCounts counts = do
+  if errors counts + failures counts == 0
+  then return ()
+  else exitFailure
 
 main :: IO ()
-main = putStrLn "Test suite not yet implemented"
\ No newline at end of file
+main = do
+  hsCounts <- runTestTT hashSetTestCases
+  processCounts hsCounts
+  seqCounts <- runTestTT seqTestCases
+  processCounts seqCounts
\ No newline at end of file