diff --git a/Alfons.moon b/Alfons.moon
index db0a766..0591b7f 100644
--- a/Alfons.moon
+++ b/Alfons.moon
@@ -1,6 +1,8 @@
 tasks:
 	build: =>
 		sh "moon bin/moonbuild.moon compile"
+	test: =>
+		sh "busted"
 	install: =>
 		sh "moon bin/moonbuild.moon install"
 	release: =>
diff --git a/moonbuild.lua b/moonbuild.lua
index fbef51e..dd64d16 100644
--- a/moonbuild.lua
+++ b/moonbuild.lua
@@ -28,6 +28,9 @@ makecached = function(fn)
   end
   local get
   get = function(val)
+    if cache == FROZEN then
+      return fn(val)
+    end
     local cached = cache[val]
     if cached ~= FROZEN and cached ~= nil then
       return unpack(cached)
@@ -40,18 +43,30 @@ makecached = function(fn)
     end
     return unpack(ret)
   end
+  local enable
+  enable = function()
+    if cache == FROZEN then
+      cache = { }
+    end
+  end
+  local disable
+  disable = function()
+    cache = FROZEN
+  end
   return setmetatable({
     get = get,
     invalidate = invalidate,
     freeze = freeze,
-    clear = clear
+    clear = clear,
+    enable = enable,
+    disable = disable
   }, {
     __call = function(self, val)
       return get(val)
     end
   })
 end
-return {
+local cached = {
   attributes = makecached(attributes),
   dir = makecached(function(file)
     local _accum_0 = { }
@@ -63,6 +78,31 @@ return {
     return _accum_0
   end)
 }
+local enable
+enable = function()
+  for _, fn in cached do
+    fn:enable()
+  end
+end
+local disable
+disable = function()
+  for _, fn in cached do
+    fn:disable()
+  end
+end
+local clear
+clear = function()
+  for _, fn in cached do
+    fn:clear()
+  end
+end
+return setmetatable({
+  enable = enable,
+  disable = disable,
+  clear = clear
+}, {
+  __index = cached
+})
 
 end
 end
@@ -70,10 +110,10 @@ end
 do
 local _ENV = _ENV
 package.preload[ "moonbuild.fsutil" ] = function( ... ) local arg = _G.arg;
-local dir, attributes
+local dir, attributes, clear, enable, disable
 do
   local _obj_0 = require('moonbuild.fscache')
-  dir, attributes = _obj_0.dir, _obj_0.attributes
+  dir, attributes, clear, enable, disable = _obj_0.dir, _obj_0.attributes, _obj_0.clear, _obj_0.enable, _obj_0.disable
 end
 local gmatch, match, gsub, sub
 do
@@ -98,22 +138,23 @@ normalizepath = function(file)
     parts = _accum_0
   end
   local absolute = (sub(file, 1, 1)) == '/'
-  for i = 1, #parts do
+  local i = 1
+  while i <= #parts do
     local _continue_0 = false
     repeat
       if parts[i] == '.' then
         remove(parts, i)
-        i = i - 1
         _continue_0 = true
         break
       end
-      if parts[i] == '..' and i ~= 1 then
+      if parts[i] == '..' and i ~= 1 and parts[i - 1] ~= '..' then
         remove(parts, i)
         remove(parts, i - 1)
-        i = i - 2
+        i = i - 1
         _continue_0 = true
         break
       end
+      i = i + 1
       _continue_0 = true
     until true
     if not _continue_0 then
@@ -121,7 +162,7 @@ normalizepath = function(file)
     end
   end
   if #parts == 0 then
-    return '.'
+    return absolute and '/' or '.'
   else
     return (absolute and '/' or '') .. concat(parts, '/')
   end
@@ -173,7 +214,12 @@ mtime = function(f)
 end
 local matchglob
 matchglob = function(str, glob)
-  local patt = '^' .. (gsub((gsub(glob, '%*%*', '.*')), '%*', '[^/]*')) .. '$'
+  glob = gsub(glob, '[%[%]%%+.?-]', function(self)
+    return '%' .. self
+  end)
+  local patt = '^' .. (gsub(glob, '%*%*?', function(self)
+    return self == '**' and '.*' or '[^/]*'
+  end)) .. '$'
   local rst
   if (type(str)) == 'table' then
     local results, i = { }, 1
@@ -280,11 +326,6 @@ invalidatecache = function(file)
   dir.invalidate(parentdir(file))
   return attributes.invalidate(file)
 end
-local clearcache
-clearcache = function()
-  dir.clear()
-  return attributes.clear()
-end
 return {
   wildcard = wildcard,
   exists = exists,
@@ -292,9 +333,12 @@ return {
   mtime = mtime,
   normalizepath = normalizepath,
   parentdir = parentdir,
+  matchglob = matchglob,
   freezecache = freezecache,
   invalidatecache = invalidatecache,
-  clearcache = clearcache
+  clearcache = clear,
+  enablecache = enable,
+  disablecache = disable
 }
 
 end
diff --git a/moonbuild/fscache.moon b/moonbuild/fscache.moon
index 8a6e982..d32ae06 100644
--- a/moonbuild/fscache.moon
+++ b/moonbuild/fscache.moon
@@ -16,6 +16,8 @@ makecached = (fn) ->
 		cache = {}
 
 	get = (val) ->
+		if cache == FROZEN
+			return fn val
 		cached = cache[val]
 		if cached!=FROZEN and cached!=nil
 			return unpack cached
@@ -24,10 +26,27 @@ makecached = (fn) ->
 			cache[val] = ret
 		unpack ret
 
-	setmetatable { :get, :invalidate, :freeze, :clear },
+	enable = ->
+		cache = {} if cache==FROZEN
+
+	disable = ->
+		cache = FROZEN
+
+	setmetatable { :get, :invalidate, :freeze, :clear, :enable, :disable },
 		__call: (val) => get val
 
-{
+cached = {
 	attributes: makecached attributes
 	dir: makecached (file) -> [k for k in dir file]
 }
+
+enable = ->
+	fn\enable! for _, fn in cached
+
+disable = ->
+	fn\disable! for _, fn in cached
+
+clear = ->
+	fn\clear! for _, fn in cached
+
+setmetatable { :enable, :disable, :clear }, __index: cached
diff --git a/moonbuild/fsutil.moon b/moonbuild/fsutil.moon
index 7d6f639..7c0214f 100644
--- a/moonbuild/fsutil.moon
+++ b/moonbuild/fsutil.moon
@@ -1,4 +1,4 @@
-import dir, attributes from require 'moonbuild.fscache'
+import dir, attributes, clear, enable, disable from require 'moonbuild.fscache'
 
 import gmatch, match, gsub, sub from string
 import insert, remove, concat from table
@@ -6,18 +6,19 @@ import insert, remove, concat from table
 normalizepath = (file) ->
 	parts = [part for part in gmatch file, '[^/]+']
 	absolute = (sub file, 1, 1)=='/'
-	for i=1, #parts
+	i = 1
+	while i<=#parts
 		if parts[i]=='.'
 			remove parts, i
-			i -= 1
 			continue
-		if parts[i]=='..' and i!=1
+		if parts[i]=='..' and i!=1 and parts[i-1]!='..'
 			remove parts, i
 			remove parts, i-1
-			i -= 2
+			i -= 1
 			continue
+		i += 1
 	if #parts==0
-		'.'
+		absolute and '/' or '.'
 	else
 		(absolute and '/' or '') .. concat parts, '/'
 
@@ -40,7 +41,8 @@ mtime = (f) ->
 	a and a.modification
 
 matchglob = (str, glob) ->
-	patt = '^'..(gsub (gsub glob, '%*%*', '.*'), '%*', '[^/]*')..'$'
+	glob = gsub glob, '[%[%]%%+.?-]', => '%'..@
+	patt = '^'..(gsub glob, '%*%*?', => @=='**' and '.*' or '[^/]*')..'$'
 	rst = if (type str)=='table'
 		results, i = {}, 1
 		for s in *str
@@ -111,14 +113,12 @@ invalidatecache = (file) ->
 	dir.invalidate parentdir file
 	attributes.invalidate file
 
-clearcache = ->
-	dir.clear!
-	attributes.clear!
-
 {
 	:wildcard
 	:exists, :isdir
 	:mtime
 	:normalizepath, :parentdir
-	:freezecache, :invalidatecache, :clearcache
+	:matchglob
+	:freezecache, :invalidatecache
+	clearcache: clear, enablecache: enable, disablecache: disable
 }
diff --git a/moonbuild/stringutil.moon b/moonbuild/stringutil.moon
index 91aeab8..f5d07f3 100644
--- a/moonbuild/stringutil.moon
+++ b/moonbuild/stringutil.moon
@@ -5,13 +5,25 @@ GLOB_PATT='^([^%%]*)%%([^%%]*)$'
 
 patsubst = (str, pattern, replacement) ->
 	return [patsubst s, pattern, replacement for s in *str] if (type str)=='table'
+
+	if str==pattern
+		return replacement
+
 	prefix, suffix = match pattern, GLOB_PATT
-	return str unless prefix
+	if not (prefix or suffix)
+		return str
+
 	reprefix, resuffix = match replacement, GLOB_PATT
-	return replacement unless reprefix
+	if not (reprefix or resuffix)
+		if (#prefix==0 or (sub str, 1, #prefix)==prefix) and (#suffix==0 or (sub str, -#suffix)==suffix)
+			return replacement
+		else
+			return str
 
-	if (sub str, 1, #prefix)==prefix and (sub str, -#suffix)==suffix
-		return reprefix..(sub str, #prefix+1, -#suffix-1)..resuffix
+	if #prefix==0 or (sub str, 1, #prefix)==prefix
+		str = reprefix..(sub str, #prefix+1)
+	if #suffix==0 or (sub str, -#suffix)==suffix
+		str = (sub str, 1, -#suffix-1)..resuffix
 	str
 
 splitsp = (str) ->
diff --git a/moonbuild/tableutil.moon b/moonbuild/tableutil.moon
index cbb4ae2..ea4f687 100644
--- a/moonbuild/tableutil.moon
+++ b/moonbuild/tableutil.moon
@@ -48,7 +48,10 @@ flatten = (tab) ->
 	out = {}
 	for e in *tab
 		if (type e)=='table'
-			insert out, v for v in *flatten e
+			if e[1] == nil and (next e)!=nil
+				insert out, e
+			else
+				insert out, v for v in *flatten e
 		else
 			insert out, e
 	out
diff --git a/spec/fsutil_spec.moon b/spec/fsutil_spec.moon
new file mode 100644
index 0000000..fe24c1c
--- /dev/null
+++ b/spec/fsutil_spec.moon
@@ -0,0 +1,111 @@
+describe 'fsutil', ->
+	describe 'normalizepath', ->
+		import normalizepath from require 'moonbuild.fsutil'
+
+		test = (expected, source) ->
+			it "normalizes #{source} correctly", ->
+				assert.equal expected, normalizepath source
+
+		testall = (tab) ->
+			for a, b in pairs tab
+				test b, a
+
+		describe 'handles already normalized paths', ->
+			testall {
+				'.': '.'
+				'..': '..'
+				'../..': '../..'
+				'/': '/'
+				'/a': '/a'
+				'/a/b': '/a/b'
+				'a': 'a'
+				'a/b': 'a/b'
+			}
+
+		describe 'trims leading slashes', ->
+			testall {
+				'a/': 'a'
+				'a/b/': 'a/b'
+				'/a/': '/a'
+				'/a/b/': '/a/b'
+			}
+
+		describe 'normalizes absolute paths', ->
+			testall {
+				'/a/a/../b': '/a/b'
+				'/a/./b': '/a/b'
+				'/a/b/c/..': '/a/b'
+				'/./a/./b/././.': '/a/b'
+			}
+
+		describe 'normalizes relative paths', ->
+			testall {
+				'../x/../../a': '../../a'
+				'../x/../a': '../a'
+				'x/..': '.'
+				'../.': '..'
+				'./a': 'a'
+			}
+
+	describe 'matchglob', ->
+		import matchglob from require 'moonbuild.fsutil'
+
+		test = (expected, source, glob) ->
+			if expected
+				it "matches #{glob} on #{source}", ->
+					assert.equal source, matchglob source, glob
+			else
+				it "doesn't match #{glob} on #{source}", ->
+					assert.equal nil, matchglob source, glob
+
+		testall = (tab) ->
+			for a, b in pairs tab
+				test b, a[1], a[2]
+
+		describe 'handles literal names', ->
+			testall {
+				[{'a', 'a'}]: true
+				[{'a.b', 'a.b'}]: true
+				[{'a/b', 'a/b'}]: true
+				[{'..', '..'}]: true
+			}
+
+		describe 'doesn\'t treat things as special chars', ->
+			testall {
+				[{'a', '.'}]: false
+				[{'a.b.c', '%S+'}]: false
+				[{'%S+', '%S+'}]: true
+				[{'%d', '%d'}]: true
+				[{'a', '%S'}]: false
+				[{'aaa', 'a+'}]: false
+			}
+
+		describe 'only matches fully', ->
+			testall {
+				[{'abcdef', 'bcde'}]: false
+				[{'a/b/c', 'b/c'}]: false
+				[{'a/b/c', 'a/b'}]: false
+			}
+
+		describe 'handles *', ->
+			testall {
+				[{'abcde', '*'}]: true
+				[{'a/b/c/d', 'a/*/c/d'}]: true
+				[{'a/b/c/d', 'a/*/d'}]: false
+				[{'abcde', 'a*e'}]: true
+				[{'abcde', 'a*f'}]: false
+				[{'a/b/c/d/e', 'a/*/*/*/e'}]: true
+				[{'a/b/c/d/e', 'a*/*/*e'}]: false
+			}
+
+		describe 'handles **', ->
+			testall {
+				[{'abcde', '**'}]: true
+				[{'a/b/c/d', 'a/**/c/d'}]: true
+				[{'abcde', 'a**e'}]: true
+				[{'a/b/c/d/e', 'a/**/**/**/e'}]: true
+				[{'a/b/c/d/e', 'a**e'}]: true
+				[{'a/b/c/d/e', 'a/**/e'}]: true
+				[{'a/b/c/d/e', 'a**f'}]: false
+				[{'abcde', 'a**f'}]: false
+			}
diff --git a/spec/stringutil_spec.moon b/spec/stringutil_spec.moon
new file mode 100644
index 0000000..c49c6d1
--- /dev/null
+++ b/spec/stringutil_spec.moon
@@ -0,0 +1,78 @@
+describe 'stringutil', ->
+	describe 'patsubst', ->
+		import patsubst from require 'moonbuild.stringutil'
+
+		test = (expected, source, patt, subst) ->
+			it "substitutes #{source} into #{expected} with #{patt} and #{subst}", ->
+				assert.equal expected, patsubst source, patt, subst
+
+		testall = (tab) ->
+			for a, b in pairs tab
+				test b, a[1], a[2], a[3]
+
+		describe 'handles just adding pre/suffix', ->
+			testall {
+				[{'a', '%', '_%'}]: '_a'
+				[{'tx', '%', 'a_%'}]: 'a_tx'
+				[{'a', '%', '%_'}]: 'a_'
+				[{'tx', '%', '%_a'}]: 'tx_a'
+				[{'a', '%', '_%_'}]: '_a_'
+			}
+
+		describe 'handles doing nothing', ->
+			for str in *({'a', 'aa', 'tx'})
+				test str, str, '%', '%'
+
+		describe 'handles literal change', ->
+			testall {
+				[{'a', 'a', 'b'}]: 'b'
+				[{'a', 'b', 'c'}]: 'a'
+				[{'aa', 'a', 'b'}]: 'aa'
+			}
+
+		describe 'handles match change', ->
+			testall {
+				[{'-a_', '-%_', 'b'}]: 'b'
+				[{'-a_', '-%', 'b'}]: 'b'
+				[{'-a_', '%_', 'b'}]: 'b'
+				[{'-a_', '_%-', 'b'}]: '-a_'
+			}
+
+		describe 'handles just removing pre/suffix', ->
+			testall {
+				[{'_a', '_%', '%'}]: 'a'
+				[{'a_', '%_', '%'}]: 'a'
+				[{'_a_', '_%_', '%'}]: 'a'
+			}
+
+		describe 'handles not matching', ->
+			testall {
+				[{'a-', '%_', '%'}]: 'a-'
+				[{'-a', '_%', '%'}]: '-a'
+				[{'-a-', '_%_', '%'}]: '-a-'
+			}
+
+		describe 'handles changing pre/suffix', ->
+			testall {
+				[{'a-', '%-', '%_'}]: 'a_'
+				[{'-a', '-%', '_%'}]: '_a'
+				[{'-a', '-%', '%_'}]: 'a_'
+				[{'_a-', '_%-', '-%_'}]: '-a_'
+			}
+
+	describe 'splitsp', ->
+		import splitsp from require 'moonbuild.stringutil'
+
+		test = (expected, source) ->
+			it "splits '#{source}' correctly", ->
+				assert.same expected, splitsp source
+
+		for source, expected in pairs {
+			'a b c': {'a', 'b', 'c'}
+			'abc': {'abc'}
+			'': {}
+			'   a b       c': {'a', 'b', 'c'}
+			'    ': {}
+			' ab c': {'ab', 'c'}
+		}
+			test expected, source
diff --git a/spec/tableutil_spec.moon b/spec/tableutil_spec.moon
new file mode 100644
index 0000000..e9d6ea7
--- /dev/null
+++ b/spec/tableutil_spec.moon
@@ -0,0 +1,82 @@
+describe 'tableutil', ->
+	describe 'sortedpairs', ->
+		import sortedpairs from require 'moonbuild.tableutil'
+
+		for src, dst in pairs {
+			[{a: '1', c: 2, b: 3}]: {'a', '1', 'b', 3, 'c', 2}
+			[{5, 4, 3}]: {1, 5, 2, 4, 3, 3}
+		}
+			it "works for #{src}", ->
+				i = 1
+				for k, v in sortedpairs src
+					assert.equal k, dst[i]
+					assert.equal v, dst[i+1]
+					i += 2
+
+	describe 'min and max', ->
+		import min, max from require 'moonbuild.tableutil'
+
+		for src, dst in pairs {
+			[{1, 2, 3, 4, 5}]: {1, 5}
+			[{5, 4, 3, 2, 1}]: {1, 5}
+			[{2, 4, 5, 1, 3}]: {1, 5}
+			[{1, 1, 1, 1, 1}]: {1, 1}
+			[{1}]: {1, 1}
+		}
+			it "min of #{table.concat src, ','} is #{dst[1]}", ->
+				assert.equal dst[1], min src
+			it "max of #{table.concat src, ','} is #{dst[2]}", ->
+				assert.equal dst[2], max src
+
+	describe 'foreach', ->
+		import foreach from require 'moonbuild.tableutil'
+
+		src = {1, 2, 5, '79'}
+		testall = (name, rst, fn) ->
+			it name, ->
+				assert.same rst, foreach src, fn
+
+
+		testall 'works with tostring', {'1', '2', '5', '79'}, tostring
+		testall 'works with tonumber', {1, 2, 5, 79}, tonumber
+		testall 'works with some mix of tonumber and comparison', {false, false, true, true}, => 3<tonumber @
+
+	describe 'first', ->
+		import first from require 'moonbuild.tableutil'
+
+		test = (name, src, rst, fn) ->
+			it name, ->
+				assert.equal rst, (first src, fn)
+
+		test 'works with == for first of list', {1, 3, 5}, 1, => @==1
+		test 'works with == for something else', {1, 3, 5}, 3, => @==3
+		test 'works with == for absent element', {1, 3, 5}, nil, => @==2
+
+	describe 'exclude', ->
+		import exclude from require 'moonbuild.tableutil'
+		unpack or= table.unpack
+
+		test = (name, src, rst, ...) ->
+			rest = {...}
+			it name, ->
+				assert.equal src, exclude src, unpack rest
+				assert.same rst, src
+
+		test 'works with nothing', {1, 2, 3}, {1, 2, 3}
+		test 'works with absent elements', {1, 2, 3}, {1, 2, 3}, 4, 5, 6
+		test 'works with some elements', {1, 2, 3}, {1}, 2, 3
+		test 'works with all elements', {1, 2, 3}, {}, 1, 2, 3
+		test 'works with a mix', {1, 2, 3}, {1, 3}, 2, 4, 5
+
+	describe 'flatten', ->
+		import flatten from require 'moonbuild.tableutil'
+
+		test = (name, src, rst) ->
+			it name, ->
+				assert.same rst, flatten src
+
+		test 'works with empty table', {}, {}
+		test 'works with flat table', {1, 2, 3}, {1, 2, 3}
+		test 'works with one level', {1, {2}, {3}}, {1, 2, 3}
+		test 'works with multiple levels', {{{1, {{2}}}, 3}}, {1, 2, 3}
+		test 'skips maps', {1, {a: 2}, 3}, {1, {a: 2}, 3}