adding cli tests

As title

pixie/tests/test_cli.py

@@ -0,0 +1,51 @@
+import os
+import subprocess
+import textwrap
+
+from pixie.cli import pixie_cythonize
+from pixie.tests.support import PixieTestCase
+
+class TestCLI(PixieTestCase):
+
+    def test_pixie_cc(self):
+        cfile_name = "test.c"
+        cfile_source = textwrap.dedent("""
+            #include<math.h>
+
+            void f(double* x, double* result){
+                *result = cos(*x) + 1;
+            }
+        """)
+        pixie_cc_test_dir = os.path.join(self.tmpdir.name, "pixie_cc_test")
+        os.mkdir(pixie_cc_test_dir)
+        cfile_path = os.path.join(pixie_cc_test_dir, cfile_name)
+        with open(cfile_path, "wt") as f:
+            f.write(cfile_source)
+        testlib_name = "testctlib"
+        command = ["pixie-cc", cfile_name, "-o", testlib_name]
+        subprocess.run(command, check=True, cwd=pixie_cc_test_dir)
+        files = sorted(os.listdir(pixie_cc_test_dir))
+        self.assertEqual(2, len(files))
+        self.assertEqual(files[0], cfile_name)
+        self.assertTrue(files[1].startswith(testlib_name))
+
+    def test_pixie_cythonize(self):
+        cyfile_name = "test.pyx"
+        cfile_name = "test.c"
+        cyfile_source = textwrap.dedent("""
+            def addone_function(int x):
+                return x + 1
+        """)
+        pixie_cythonize_test_dir = os.path.join(self.tmpdir.name, "pixie_cythonize_test")
+        os.mkdir(pixie_cythonize_test_dir)
+        cyfile_path = os.path.join(pixie_cythonize_test_dir, cyfile_name)
+        with open(cyfile_path, "wt") as f:
+            f.write(cyfile_source)
+        testlib_name = "testcylib"
+        command = ["pixie-cythonize", cyfile_name, "-o", testlib_name]
+        subprocess.run(command, check=True, cwd=pixie_cythonize_test_dir)
+        files = sorted(os.listdir(pixie_cythonize_test_dir))
+        self.assertEqual(3, len(files))
+        self.assertEqual(files[0], cfile_name)
+        self.assertEqual(files[1], cyfile_name)
+        self.assertTrue(files[2].startswith(testlib_name))