diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..c125861
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,53 @@
+import env, nose
+from os import environ
+from urlparse import urlparse as _urlparse
+
+searchprefix = 'env1'
+matchdata = {'env1TESTS1': 'aA', 'ENV1tests2': 'bB', 'env1tests3': 'cC'}
+nomatchdata = {'env2TESTS4': 'dD', 'ENV2tests5': 'eE', 'env2tests6': 'fF'}
+
+for matchvalue in matchdata:
+	environ[matchvalue] = matchdata[matchvalue]
+
+for nomatchvalue in nomatchdata:
+	environ[nomatchvalue] = nomatchdata[nomatchvalue]
+
+def compare_values(a, b):
+	assert a == b
+
+def test_lower_dict():
+	lowereddict = env.lower_dict(matchdata)
+
+	yield compare_values, len(lowereddict), len(matchdata)
+
+	for item in matchdata:
+		yield compare_values, matchdata[item], lowereddict[item.lower()]
+
+def test_urlparse():
+	urldata = {'url1': 'http://env1.test', 'url2': 'ftp://env2.test'}
+
+	parseddata = env.urlparse(urldata)
+
+	yield compare_values, len(parseddata), len(urldata)
+
+	for item in urldata:
+		yield compare_values, _urlparse(urldata[item]), parseddata[item]
+
+def test_prefix():
+	prefixsearch = env.prefix(searchprefix)
+
+	yield compare_values, len(prefixsearch), len(matchdata)
+
+	for item in matchdata:
+		yield compare_values, matchdata[item], prefixsearch[item.lower()[len(searchprefix):]]
+
+def test_map():
+	mapdata = {'a': 'env1tests1', 'b': 'env1tests2', 'c': 'env1tests3'}
+	originaldata = {'env1tests1': 'aA', 'env1tests2': 'bB', 'env1tests3': 'cC'}
+
+	mapsearch = env.map(a='env1tests1', b='env1tests2', c='env1tests3')
+
+	yield compare_values, len(mapsearch), len(mapdata)
+
+	for item in mapdata:
+		yield compare_values, originaldata[mapdata[item]], mapsearch[item]