Add unit tests for GnuPG command-line generator

Extract a function to calculate GPG commands to be executed and cover it with
unit tests.

GnuPG/__init__.py

@@ -31,8 +31,12 @@ LINE_USER_ID = 'uid'
 
 POS_FINGERPRINT = 9
 
+def build_command(key_home, *args, **kwargs):
+	cmd = ["gpg", '--homedir', key_home] + list(args)
+	return cmd
+
 def private_keys( keyhome ):
-	cmd = ['/usr/bin/gpg', '--homedir', keyhome, '--list-secret-keys', '--with-colons']
+	cmd = build_command(keyhome, '--list-secret-keys', '--with-colons')
 	p = subprocess.Popen( cmd, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
 	p.wait()
 	keys = dict()
@@ -46,7 +50,7 @@ def private_keys( keyhome ):
 	return keys
 
 def public_keys( keyhome ):
-	cmd = ['/usr/bin/gpg', '--homedir', keyhome, '--list-keys', '--with-colons']
+	cmd = build_command(keyhome, '--list-keys', '--with-colons')
 	p = subprocess.Popen( cmd, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
 	p.wait()
 
@@ -78,7 +82,7 @@ def confirm_key( content, email ):
 	os.mkdir(tmpkeyhome)
 	localized_env = os.environ.copy()
 	localized_env["LANG"] = "C"
-	p = subprocess.Popen( ['/usr/bin/gpg', '--homedir', tmpkeyhome, '--import', '--batch'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=localized_env )
+	p = subprocess.Popen( build_command(tmpkeyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=localized_env )
 	result = p.communicate(input=content)[1]
 	confirmed = False
 
@@ -97,7 +101,7 @@ def confirm_key( content, email ):
 
 # adds a key and ensures it has the given email address
 def add_key( keyhome, content ):
-	p = subprocess.Popen( ['/usr/bin/gpg', '--homedir', keyhome, '--import', '--batch'], stdin=subprocess.PIPE, stdout=subprocess.PIPE,stderr=subprocess.PIPE )
+	p = subprocess.Popen( build_command(keyhome, '--import', '--batch'), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
 	p.communicate(input=content)
 	p.wait()
 
@@ -107,7 +111,7 @@ def delete_key( keyhome, email ):
 
 	if result[1]:
 		# delete all keys matching this email address
-		p = subprocess.Popen( ['/usr/bin/gpg', '--homedir', keyhome, '--delete-key', '--batch', '--yes', result[1]], stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
+		p = subprocess.Popen( build_command(keyhome, '--delete-key', '--batch', '--yes', result[1]), stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE )
 		p.wait()
 		return True
 
@@ -131,7 +135,7 @@ class GPGEncryptor:
 		return (encdata, p.returncode)
 
 	def _command(self):
-		cmd = ["/usr/bin/gpg", "--trust-model", "always", "--homedir", self._keyhome, "--batch", "--yes", "--pgp7", "--no-secmem-warning", "-a", "-e"]
+		cmd = build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--pgp7", "--no-secmem-warning", "-a", "-e")
 
 		# add recipients
 		for recipient in self._recipients:
@@ -159,6 +163,4 @@ class GPGDecryptor:
 		return (decdata, p.returncode)
 
 	def _command(self):
-		cmd = ["/usr/bin/gpg", "--trust-model", "always", "--homedir", self._keyhome, "--batch", "--yes", "--no-secmem-warning", "-a", "-d"]
-
-		return cmd
+		return build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--no-secmem-warning", "-a", "-d")

Makefile

@@ -2,9 +2,22 @@ PYTHON = python2.7
 
 .PHONY: test pre-clean clean
 
+#
+# Run a set of end-to-end tests.
+#
+# Test scenarios are described and configured by the test/e2e.ini
+# file.  Basically this is just a script that feeds GPG Mailgate with
+# known input and checks whether output meets expectations.
+#
 test: test/tmp test/logs pre-clean
 	$(PYTHON) test/e2e_test.py
 
+#
+# Run unit tests
+#
+unittest:
+	$(PYTHON) -m unittest discover -s test
+
 pre-clean:
 	rm -fv test/gpg-mailgate.conf
 	rm -f test/logs/*.log

test/test_gnupg.py

@@ -0,0 +1,16 @@
+import GnuPG
+
+import unittest
+
+class GnuPGUtilitiesTest(unittest.TestCase):
+	def test_build_default_command(self):
+		cmd = GnuPG.build_command("test/keyhome")
+		self.assertEqual(cmd, ["gpg", "--homedir", "test/keyhome"])
+
+	def test_build_command_extended_with_args(self):
+		cmd = GnuPG.build_command("test/keyhome", "--foo", "--bar")
+		self.assertEqual(cmd, ["gpg", "--homedir", "test/keyhome", "--foo", "--bar"])
+
+
+if __name__ == '__main__':
+	unittest.main()