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diff --git a/specs/Specs/KeySequenceSpec.hs b/specs/Specs/KeySequenceSpec.hs
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+module Specs.KeySequenceSpec where
+
+import Chelleport.KeySequence (findMatchPosition, generateKeyCells, nextChars)
+import Test.Hspec
+
+test = do
+  describe "#nextChars" $ do
+    it "filters key sequence and returns next characters" $ do
+      nextChars "AB" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+        `shouldBe` Just "CD"
+      nextChars "A" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+        `shouldBe` Just "BM"
+
+    context "when exact match is present" $ do
+      it "returns next characters" $ do
+        nextChars "ABD" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+          `shouldBe` Just ""
+
+    context "when there are no matches" $ do
+      it "returns nothing" $ do
+        nextChars "FOO" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+          `shouldBe` Nothing
+
+  describe "#generateKeyCells" $ do
+    it "generates grid of key sequences" $ do
+      generateKeyCells (4, 4) "ABCDEF"
+        `shouldBe` [ ["HKA", "HKB", "LKA", "LKB"],
+                     ["HKC", "HKD", "LKC", "LKD"],
+                     ["HJA", "HJB", "LJA", "LJB"],
+                     ["HJC", "HJD", "LJC", "LJD"]
+                   ]
+    context "when the the keys set is too short" $ do
+      it "cycles back to first character" $ do
+        generateKeyCells (4, 4) "AB"
+          `shouldBe` [ ["HKA", "HKB", "LKA", "LKB"],
+                       ["HKA", "HKB", "LKA", "LKB"],
+                       ["HJA", "HJB", "LJA", "LJB"],
+                       ["HJA", "HJB", "LJA", "LJB"]
+                     ]
+
+  describe "#findMatchPosition" $ do
+    it "returns the position of the matching key sequence" $ do
+      findMatchPosition "ABD" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+        `shouldBe` Just (1, 2)
+
+    context "when sequence is incomplete" $ do
+      it "returns nothing" $ do
+        findMatchPosition "AB" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+          `shouldBe` Nothing
+
+    context "when there are no matches" $ do
+      it "returns nothing" $ do
+        findMatchPosition "FOO" [["XYZ", "ABC"], ["AMK", "BBL", "ABD"]]
+          `shouldBe` Nothing