added a new method minify_css with parameters level and gzip of default values none. Also added tests

Author: gowthamraj198

filestack/mixins/imagetransformation.py

@@ -126,6 +126,9 @@ def pdf_info(self, colorinfo=None):
     def pdf_convert(self, pageorientation=None, pageformat=None, pages=None):
         return self._add_transform_task('pdfconvert', locals())
 
+    def minify_css(self,level=None, gzip=None):
+        return self._add_transform_task('minify_css',locals())
+
     def av_convert(self, *, preset=None, force=None, title=None, extname=None, filename=None,
                    width=None, height=None, upscale=None, aspect_mode=None, two_pass=None,
                    video_bitrate=None, fps=None, keyframe_interval=None, location=None,

tests/transformation_test.py

@@ -258,6 +258,18 @@ def test_pdf_convert(transform):
     result = transform.pdf_convert(pageorientation='landscape')
     assert result.url == target_url
 
+def test_minify_css(transform):
+    target_url = '{}/{}/minify_css/{}'.format(config.CDN_URL, APIKEY, EXTERNAL_URL)
+    result = transform.minify_css()
+    assert result.url == target_url
+
+
+def test_minify_css_with_params(transform):
+    target_url = '{}/{}/minify_css=gzip:fals    e,level:1/{}'.format(config.CDN_URL, APIKEY, EXTERNAL_URL)
+    result = transform.minify_css(level=1,gzip=False)
+    print(result.url)
+    print(target_url)
+    assert result.url == target_url    
 
 def quality(transform):
     target_url = '{}/{}/quality=value:75/{}'.format(config.CDN_URL, APIKEY, EXTERNAL_URL)