Add test

Author: utahta

installer/installer_python_test.go

@@ -23,8 +23,8 @@ func TestPython_Install(t *testing.T) {
 	testcases := []struct {
 		version string
 	}{
-		{"3.4.8"},
-		{"3.5.5"},
+		{"3.6.4"},
+		{"https://www.python.org/ftp/python/3.7.0/Python-3.7.0b1.tgz"},
 	}
 
 	for _, testcase := range testcases {