diff --git a/tests/__init__.py b/tests/__init__.py
index 8c9e503d..8e916266 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,3 +1,6 @@
+"""Utilities used by HTTPie tests.
+
+"""
 import os
 import sys
 import time
@@ -5,7 +8,7 @@ import json
 import shutil
 import tempfile
 
-from httpie import ExitStatus
+import httpie
 from httpie.models import Environment
 from httpie.core import main
 from httpie.compat import bytes, str
@@ -74,49 +77,14 @@ class TestEnvironment(Environment):
             self._shutil.rmtree(self.config_dir)
 
 
-class Response(object):
-    stderr = None
-    json = None
-    exit_status = None
-
-
-class BytesResponse(bytes, Response):
-    pass
-
-
-class StrResponse(str, Response):
-
-    @property
-    def json(self):
-        if not hasattr(self, '_json'):
-            self._json = None
-            # De-serialize JSON body if possible.
-            if COLOR in self:
-                # Colorized output cannot be parsed.
-                pass
-            elif self.strip().startswith('{'):
-                # Looks like JSON body.
-                self._json = json.loads(self)
-            elif self.count('Content-Type:') == 1 and 'application/json' in self:
-                # Looks like a JSON HTTP message, try to extract its body.
-                try:
-                    j = self.strip()[self.strip().rindex('\r\n\r\n'):]
-                except ValueError:
-                    pass
-                else:
-                    try:
-                        self._json = json.loads(j)
-                    except ValueError:
-                        pass
-        return self._json
-
-
 def http(*args, **kwargs):
     """
     Invoke `httpie.core.main()` with `args` and `kwargs`,
-    and return a unicode response.
+    and return a `CLIResponse` subclass.
+
+    It is either a `StrResponse`, or `BytesResponse`
+    if unable to decode the output.
 
-    Return a `StrResponse`, or `BytesResponse` if unable to decode the output.
     The response has the following attributes:
 
         `stderr`: text written to stderr
@@ -125,6 +93,30 @@ def http(*args, **kwargs):
 
     Exceptions are propagated except for SystemExit.
 
+    $ http GET example.org:
+
+        >>> r = http('GET', 'example.org')
+        >>> type(r) == StrCLIResponse
+        True
+        >>> r.exit_status
+        0
+        >>> r.stderr
+        ''
+        >>> 'HTTP/1.1 200 OK' in r
+        True
+        >>> r.json is None
+        True
+
+    $ http --version:
+
+        >>> r = http('--version')
+        >>> r.exit_status
+        1
+        >>> r.stderr.strip() == httpie.__version__
+        True
+        >>> r == ''
+        True
+
     """
     env = kwargs.get('env')
     if not env:
@@ -136,7 +128,6 @@ def http(*args, **kwargs):
 
     if '--debug' not in args and '--traceback' not in args:
         args = ['--traceback'] + args
-    print(args)
     try:
         try:
             exit_status = main(args=args, **kwargs)
@@ -147,15 +138,17 @@ def http(*args, **kwargs):
             sys.stderr.write(stderr.read())
             raise
         except SystemExit:
-            exit_status = ExitStatus.ERROR
+            exit_status = httpie.ExitStatus.ERROR
 
         stdout.seek(0)
         stderr.seek(0)
         output = stdout.read()
         try:
-            r = StrResponse(output.decode('utf8'))
+            # noinspection PyArgumentList
+            r = StrCLIResponse(output.decode('utf8'))
         except UnicodeDecodeError:
-            r = BytesResponse(output)
+            # noinspection PyArgumentList
+            r = BytesCLIResponse(output)
         r.stderr = stderr.read()
         r.exit_status = exit_status
 
@@ -165,3 +158,55 @@ def http(*args, **kwargs):
         stdout.close()
         stderr.close()
 
+
+class BaseCLIResponse(object):
+    """
+    Represents the result of simulated `$ http' invocation  via `http()`.
+
+    Holds and provides access to:
+
+        - stdout output: print(self)
+        - stderr output: print(self.stderr)
+        - exit_status output: print(self.exit_status)
+
+    """
+    stderr = None
+    json = None
+    exit_status = None
+
+
+class BytesCLIResponse(bytes, BaseCLIResponse):
+    """
+    Used as a fallback when a StrCLIResponse cannot be used.
+
+    E.g. the output contains binary data. `.json` will always be None.
+
+    """
+
+
+class StrCLIResponse(str, BaseCLIResponse):
+
+    @property
+    def json(self):
+        if not hasattr(self, '_json'):
+            self._json = None
+            # De-serialize JSON body if possible.
+            if COLOR in self:
+                # Colorized output cannot be parsed.
+                pass
+            elif self.strip().startswith('{'):
+                # Looks like JSON body.
+                self._json = json.loads(self)
+            elif (self.count('Content-Type:') == 1
+                    and 'application/json' in self):
+                # Looks like a JSON HTTP message, try to extract its body.
+                try:
+                    j = self.strip()[self.strip().rindex('\r\n\r\n'):]
+                except ValueError:
+                    pass
+                else:
+                    try:
+                        self._json = json.loads(j)
+                    except ValueError:
+                        pass
+        return self._json