diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,11 @@
 # Revision history for hslua-module-text
 
+## 0.1.2.1  -- 2017-11-24
+
+- Add missing test file in the sources archive. This oversight had
+  caused some stackage test failures.
+
+
 ## 0.1.2  -- 2017-11-17
 
 - Run tests with Travis CI.
diff --git a/hslua-module-text.cabal b/hslua-module-text.cabal
--- a/hslua-module-text.cabal
+++ b/hslua-module-text.cabal
@@ -1,5 +1,5 @@
 name:                hslua-module-text
-version:             0.1.2
+version:             0.1.2.1
 synopsis:            Lua module for text
 description:         UTF-8 aware subset of Lua's `string` module.
 homepage:            https://github.com/hslua/hslua-module-test
@@ -11,6 +11,7 @@
 category:            Foreign
 build-type:          Simple
 extra-source-files:  ChangeLog.md
+                     test/hstext-test.lua
 cabal-version:       >=1.10
 
 source-repository head
diff --git a/test/hstext-test.lua b/test/hstext-test.lua
new file mode 100644
--- /dev/null
+++ b/test/hstext-test.lua
@@ -0,0 +1,29 @@
+--
+-- Tests for the hstext module
+--
+local hstext = require 'hstext'
+
+assert(hstext.lower 'YELLING' == 'yelling')
+assert(hstext.upper 'silence' == 'SILENCE')
+assert(hstext.len 'five' == 4)
+
+-- Test UTF-8
+assert(hstext.upper 'Lübeck' == 'LÜBECK')
+assert(hstext.upper 'Spaß' == 'SPASS')
+
+assert(hstext.len 'Straße' == 6)
+assert(hstext.len 'Charité' == 7)
+assert(hstext.len '☃' == 1)
+
+assert(hstext.reverse 'être' == 'ertê')
+assert(hstext.reverse 'être' == 'ertê')
+
+local hw = 'Hello, World'
+assert(string.sub(hw, 6)      == hstext.sub(hw, 6))
+assert(string.sub(hw, -1, -1) == hstext.sub(hw, -1, -1))
+assert(string.sub(hw, -7, -2) == hstext.sub(hw, -7, -2))
+assert(string.sub(hw,  7, -2) == hstext.sub(hw, 7, -2))
+assert(string.sub(hw,  1,  5) == hstext.sub(hw, 1, 5))
+assert(string.sub(hw,  5,  0) == hstext.sub(hw, 5, 0))
+assert(string.sub(hw,  0,  2) == hstext.sub(hw, 0, 2))
+assert(string.sub(hw, -19, 5) == hstext.sub(hw, -19, 5))