diff --git a/tools/buildman/test.py b/tools/buildman/test.py
index bfad309..ac0a7ab 100644
--- a/tools/buildman/test.py
+++ b/tools/buildman/test.py
@@ -148,6 +148,7 @@
         self.toolchains.Add('arm-linux-gcc', test=False)
         self.toolchains.Add('sparc-linux-gcc', test=False)
         self.toolchains.Add('powerpc-linux-gcc', test=False)
+        self.toolchains.Add('/path/to/aarch64-linux-gcc', test=False)
         self.toolchains.Add('gcc', test=False)
 
         # Avoid sending any output
@@ -868,6 +869,80 @@
             self.assertEqual([4, 5], control.read_procs(tmpdir))
             self.assertEqual(self.finish_time, self.cur_time)
 
+    def call_make_environment(self, tchn, in_env=None):
+        """Call Toolchain.MakeEnvironment() and process the result
+
+        Args:
+            tchn (Toolchain): Toolchain to use
+            in_env (dict): Input environment to use, None to use current env
+
+        Returns:
+            tuple:
+                dict: Changes that MakeEnvironment has made to the environment
+                    key: Environment variable that was changed
+                    value: New value (for PATH this only includes components
+                        which were added)
+                str: Full value of the new PATH variable
+        """
+        env = tchn.MakeEnvironment(env=in_env)
+
+        # Get the original environment
+        orig_env = dict(os.environb if in_env is None else in_env)
+        orig_path = orig_env[b'PATH'].split(b':')
+
+        # Find new variables
+        diff = dict((k, env[k]) for k in env if orig_env.get(k) != env[k])
+
+        # Find new / different path components
+        diff_path = None
+        new_path = None
+        if b'PATH' in diff:
+            new_path = diff[b'PATH'].split(b':')
+            diff_paths = [p for p in new_path if p not in orig_path]
+            diff_path = b':'.join(p for p in new_path if p not in orig_path)
+            if diff_path:
+                diff[b'PATH'] = diff_path
+            else:
+                del diff[b'PATH']
+        return diff, new_path
+
+    def test_toolchain_env(self):
+        """Test PATH and other environment settings for toolchains"""
+        # Use a toolchain which has a path
+        tchn = self.toolchains.Select('aarch64')
+
+        # Normal case
+        diff = self.call_make_environment(tchn)[0]
+        self.assertEqual(
+            {b'CROSS_COMPILE': b'/path/to/aarch64-linux-', b'LC_ALL': b'C'},
+            diff)
+
+        # When overriding the toolchain, only LC_ALL should be set
+        tchn.override_toolchain = True
+        diff = self.call_make_environment(tchn)[0]
+        self.assertEqual({b'LC_ALL': b'C'}, diff)
+
+        # Test that virtualenv is handled correctly
+        tchn.override_toolchain = False
+        sys.prefix = '/some/venv'
+        env = dict(os.environb)
+        env[b'PATH'] = b'/some/venv/bin:other/things'
+        tchn.path = '/my/path'
+        diff, diff_path = self.call_make_environment(tchn, env)
+
+        self.assertNotIn(b'PATH', diff)
+        self.assertEqual(None, diff_path)
+        self.assertEqual(
+            {b'CROSS_COMPILE': b'/my/path/aarch64-linux-', b'LC_ALL': b'C'},
+            diff)
+
+        # Handle a toolchain wrapper
+        tchn.path = ''
+        bsettings.add_section('toolchain-wrapper')
+        bsettings.set_item('toolchain-wrapper', 'my-wrapper', 'fred')
+        diff = self.call_make_environment(tchn)[0]
+        self.assertEqual(
+            {b'CROSS_COMPILE': b'fred aarch64-linux-', b'LC_ALL': b'C'}, diff)
 
 if __name__ == "__main__":
     unittest.main()