diff --git a/design.txt b/design.txt
index eb940ee1..b0657d2c 100644
--- a/design.txt
+++ b/design.txt
@@ -41,6 +41,7 @@ Files:
 		playlist.h
 		prefs.h
 		print.h
+		test.h
 		version.h
 	ocarina/lib/
 		audio.cpp
@@ -53,6 +54,7 @@ Files:
 		library.cpp
 		playlist.cpp
 		prefs.cpp
+		test.cpp
 
 
 
@@ -75,6 +77,19 @@ API:
 
 
 
+Test framework: (lib/test.cpp)
+	Unit tests will require a basic framework for manipulating files and
+	directories in the filesystem.  Compiling the tests/ directory will
+	enable the CONFIG_TEST option, which in turn compiles the test library.
+
+API:
+	void rm_test_config()
+		Remove the $XDG_CONFG_HOME/ocarina-test/ directory.
+	void rm_test_data()
+		Remove the $XDG_DATA_HOME/ocarina-test/ directory.
+
+
+
 Versioning: (include/version.h)
 	This file contains a simple function for returning a string stating
 	the current version.
diff --git a/design/test.txt b/design/test.txt
new file mode 100644
index 00000000..d9d8fb24
--- /dev/null
+++ b/design/test.txt
@@ -0,0 +1,19 @@
+== Files ==
+	ocarina/include/
+		test.h
+	ocarina/lib/
+		test.cpp
+
+== Depends ==
+install
+
+Test framework: (lib/test.cpp)
+	Unit tests will require a basic framework for manipulating files and
+	directories in the filesystem.  Compiling the tests/ directory will
+	enable the CONFIG_TEST option, which in turn compiles the test library.
+
+API:
+	void rm_test_config()
+		Remove the $XDG_CONFG_HOME/ocarina-test/ directory.
+	void rm_test_data()
+		Remove the $XDG_DATA_HOME/ocarina-test/ directory.