tests: move/rename/cleanup vspec based tests (#860)

The main motivation is to being able to use normal/other pytest based
tests.

Therefore this moves everything from conftest into test_integration
itself.

test/vspec/documentation.vim

@@ -0,0 +1,31 @@
+source plugin/jedi.vim
+
+describe 'documentation docstrings'
+    before
+        set filetype=python
+    end
+
+    after
+        try | %bwipeout! | catch | endtry
+    end
+
+    it 'simple'
+        Expect maparg('K') == ':call jedi#show_documentation()<CR>'
+        put = 'ImportError'
+        normal GK
+        Expect bufname('%') == "__doc__"
+        Expect &filetype == 'rst'
+        let content = join(getline(1,'$'), "\n")
+        Expect stridx(content, "Import can't find module") > 0
+        normal K
+        Expect bufname('%') == ''
+    end
+
+    it 'no documentation'
+        put = 'x = 2'
+        normal o<ESC>GK
+        Expect bufname('%') == ''
+    end
+end
+
+" vim: et:ts=4:sw=4