Add integration test.

To make sure that yapfify works with the most recent version of yapf.
Run this test against the master branch.

Author: JorisE

.gitignore

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+.cask 

Cask

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+(source gnu)
+(source melpa)
+
+(package-file "yapfify.el")
+
+(development
+ (depends-on "f")
+ (depends-on "ert-runner"))

README.org

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+[[https://circleci.com/gh/JorisE/yapfify][https://circleci.com/gh/JorisE/yapfify.svg?style=svg]]
+
+
 * Yapfify 
 Yapfify uses yapf to format a Python buffer. It can be called explicitly on a
 certain buffer, but more conveniently, a minor-mode 'yapf-mode' is provided

circle.yml

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+dependencies:
+  pre:
+    - sudo apt-get update; sudo apt-get install emacs
+    - sudo pip install -U git+http://github.com/google/yapf
+    - curl -fsSL https://raw.githubusercontent.com/cask/cask/master/go | python
+
+test:
+  pre:
+    - PATH="/home/ubuntu/.cask:$PATH"./run_tests.sh

run_tests.sh

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+#!/bin/bash
+
+# run_tests.sh is used only to get the DATA_DIR. It feels like there should be a
+# better way to do this.
+DATA_DIR=$(pwd)/test/data/ cask exec ert-runner -l yapfify.el

test/data/.style.yapf

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+[style]
+indent_width=2

test/data/formatted.py

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+import os
+
+
+def function():
+  x = 2

test/data/unformatted.py

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+import os
+
+def function():
+    x = 2

test/yapfify-test.el

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+(ert-deftest test-yapfify-buffers ()
+  "Test that yapfiffy reformats a buffer using the settings in .style.yapf"
+  (let* ((datadir (getenv "DATA_DIR"))
+         (unformatted (f-join datadir "unformatted.py"))
+         (formatted (f-join datadir "formatted.py")))
+    (find-file unformatted)
+    ;; When yapf is called on the unformatted buffer, yapf should exit with status code 1.
+    (should (eq (call-process-region (point-min) (point-max) "diff"  nil nil nil formatted "-") 1))
+    (yapfify-buffer)
+    ;; After yapfify-buffer is used, yapf should exit with exit code 0.
+    (should (eq (call-process-region (point-min) (point-max) "diff"  nil nil nil formatted "-") 0))
+    )
+  )