✅ Add settings specs

To support the changes in #6, this spec suite performs an empty diff
file load, adds some text with trailing spaces, and saves it.

With the default settings for the package, it should never trim
whiespace if the whitespace package is enabled.

Signed-off-by: Mike Fiedler <[email protected]>

Author: miketheman

spec/settings-spec.coffee

@@ -0,0 +1,32 @@
+path = require 'path'
+temp = require 'temp'
+
+describe 'Settings', ->
+  editor = []
+
+  beforeEach ->
+    directory = temp.mkdirSync()
+    atom.project.setPaths([directory])
+    filePath = path.join(directory, 'atom.diff')
+
+    waitsForPromise ->
+      atom.workspace.open(filePath).then (o) -> editor = o
+    waitsForPromise ->
+      atom.packages.activatePackage('whitespace')
+    waitsForPromise ->
+      atom.packages.activatePackage('language-diff')
+
+  it 'loads both packages', ->
+    expect(atom.packages.isPackageActive('whitespace')).toBe true
+    expect(atom.packages.isPackageActive('language-diff')).toBe true
+
+  it 'sets the grammar', ->
+    expect(editor.getGrammar().name).toBe 'Diff'
+
+  it 'sets the whitespace config to false', ->
+    expect(editor.config.get('whitespace.removeTrailingWhitespace', scope: ['.source.diff'])).toBe false
+
+  it 'does not trim trailing whitespace', ->
+    editor.insertText "+def fib(n, sequence = [1])    \n"
+    editor.save()
+    expect(editor.getText()).toBe "+def fib(n, sequence = [1])    \n"