[test] Add test for jpeg and clean code

We can remove the `get_recipe_env` because the environment that we use is already using a clang as default compiler (not the case when we migrated the jpeg recipe to use `cmake`)...so we can do a little refactor :)

Author: opacam

pythonforandroid/recipes/jpeg/__init__.py

@@ -2,7 +2,6 @@
 from pythonforandroid.logger import shprint
 from pythonforandroid.util import current_directory
 from os.path import join
-from os import environ, uname
 import sh
 
 
@@ -35,10 +34,9 @@ def build_arch(self, arch):
                     '-DCMAKE_POSITION_INDEPENDENT_CODE=1',
                     '-DCMAKE_ANDROID_ARCH_ABI={arch}'.format(arch=arch.arch),
                     '-DCMAKE_ANDROID_NDK=' + self.ctx.ndk_dir,
-                    '-DCMAKE_C_COMPILER={toolchain}/bin/clang'.format(
-                        toolchain=env['TOOLCHAIN']),
-                    '-DCMAKE_CXX_COMPILER={toolchain}/bin/clang++'.format(
-                        toolchain=env['TOOLCHAIN']),
+                    '-DCMAKE_C_COMPILER={cc}'.format(cc=arch.get_clang_exe()),
+                    '-DCMAKE_CXX_COMPILER={cc_plus}'.format(
+                        cc_plus=arch.get_clang_exe(plus_plus=True)),
                     '-DCMAKE_BUILD_TYPE=Release',
                     '-DCMAKE_INSTALL_PREFIX=./install',
                     '-DCMAKE_TOOLCHAIN_FILE=' + toolchain_file,
@@ -54,16 +52,5 @@ def build_arch(self, arch):
                     _env=env)
             shprint(sh.make, _env=env)
 
-    def get_recipe_env(self, arch=None, with_flags_in_cc=False):
-        env = environ.copy()
-
-        build_platform = '{system}-{machine}'.format(
-            system=uname()[0], machine=uname()[-1]).lower()
-        env['TOOLCHAIN'] = join(self.ctx.ndk_dir, 'toolchains/llvm/'
-                                'prebuilt/{build_platform}'.format(
-                                    build_platform=build_platform))
-
-        return env
-
 
 recipe = JpegRecipe()

tests/recipes/test_jpeg.py

@@ -0,0 +1,9 @@
+import unittest
+from tests.recipes.recipe_lib_test import BaseTestForCmakeRecipe
+
+
+class TestJpegRecipe(BaseTestForCmakeRecipe, unittest.TestCase):
+    """
+    An unittest for recipe :mod:`~pythonforandroid.recipes.jpeg`
+    """
+    recipe_name = "jpeg"