#!/usr/bin/env python

# Copyright (c) 2012 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for the common.py file."""

import gyp.common
import unittest
import sys


class TestTopologicallySorted(unittest.TestCase):
    def test_Valid(self):
        """Test that sorting works on a valid graph with one possible order."""
        graph = {
            "a": ["b", "c"],
            "b": [],
            "c": ["d"],
            "d": ["b"],
        }

        def GetEdge(node):
            return tuple(graph[node])

        self.assertEqual(
            gyp.common.TopologicallySorted(graph.keys(), GetEdge), ["a", "c", "d", "b"]
        )

    def test_Cycle(self):
        """Test that an exception is thrown on a cyclic graph."""
        graph = {
            "a": ["b"],
            "b": ["c"],
            "c": ["d"],
            "d": ["a"],
        }

        def GetEdge(node):
            return tuple(graph[node])

        self.assertRaises(
            gyp.common.CycleError, gyp.common.TopologicallySorted, graph.keys(), GetEdge
        )


class TestGetFlavor(unittest.TestCase):
    """Test that gyp.common.GetFlavor works as intended"""

    original_platform = ""

    def setUp(self):
        self.original_platform = sys.platform

    def tearDown(self):
        sys.platform = self.original_platform

    def assertFlavor(self, expected, argument, param):
        sys.platform = argument
        self.assertEqual(expected, gyp.common.GetFlavor(param))

    def test_platform_default(self):
        self.assertFlavor("freebsd", "freebsd9", {})
        self.assertFlavor("freebsd", "freebsd10", {})
        self.assertFlavor("openbsd", "openbsd5", {})
        self.assertFlavor("solaris", "sunos5", {})
        self.assertFlavor("solaris", "sunos", {})
        self.assertFlavor("linux", "linux2", {})
        self.assertFlavor("linux", "linux3", {})
        self.assertFlavor("linux", "linux", {})

    def test_param(self):
        self.assertFlavor("foobar", "linux2", {"flavor": "foobar"})


if __name__ == "__main__":
    unittest.main()