Add environment update needed for issue #510 test

issue.features/environment.py

@@ -6,11 +6,48 @@
   * active tags
 """
 
+from __future__ import print_function
 from behave.tag_matcher import ActiveTagMatcher, setup_active_tag_values
 from behave4cmd0.setup_command_shell import setup_command_shell_processors4behave
 import six
 import sys
 import platform
+import os.path
+
+
+def require_tool(tool_name):
+    """Check if a tool (an executable program) is provided on this platform.
+
+    :params tool_name:  Name of the tool to check if it is available.
+    :return: True, if tool is found.
+    :return: False, if tool is not available (or not in search path).
+    """
+    # print("CHECK-TOOL: %s" % tool_name)
+    path = os.environ.get("PATH")
+    if not path:
+        return False
+
+    for searchdir in path.split(os.pathsep):
+        executable1 = os.path.normpath(os.path.join(searchdir, tool_name))
+        executables = [executable1]
+        if sys.platform.startswith("win"):
+            executables.append(executable1 + ".exe")
+
+        for executable in executables:
+            # print("TOOL-CHECK: %s" % os.path.abspath(executable))
+            if os.path.isfile(executable):
+                # print("TOOL-FOUND: %s" % os.path.abspath(executable))
+                return True
+    # -- OTHERWISE: Tool not found
+    # print("TOOL-NOT-FOUND: %s" % tool_name)
+    return False
+
+def as_bool_string(value):
+    if bool(value):
+        return "yes"
+    else:
+        return "no"
+
 
 # -- MATCHES ANY TAGS: @use.with_{category}={value}
 # NOTE: active_tag_value_provider provides category values for active tags.
@@ -21,6 +58,7 @@
     "python.implementation": platform.python_implementation().lower(),
     "pypy":    str("__pypy__" in sys.modules).lower(),
     "os":      sys.platform,
+    "xmllint": as_bool_string(require_tool("xmllint")),
 }
 active_tag_matcher = ActiveTagMatcher(active_tag_value_provider)
 
@@ -38,3 +76,4 @@ def before_feature(context, feature):
 def before_scenario(context, scenario):
     if active_tag_matcher.should_exclude_with(scenario.effective_tags):
         scenario.skip(reason=active_tag_matcher.exclude_reason)
+