diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 000000000..aa7a96c27
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,6 @@
+coverage:
+  status:
+    patch:
+      default:
+        # allowed to drop X% and still result in a "success" commit status
+        threshold: 0.05
diff --git a/CHANGES b/CHANGES
index 5ba7946a6..bcfe2b92d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,8 @@ Bugs fixed
 * #4608: epub: Invalid meta tag is generated
 * #4260: autodoc: keyword only argument separator is not disappeared if it is
   appeared at top of the argument list
+* #4622: epub: :confval:`epub_scheme` does not effect to content.opf
+* #4627: graphviz: Fit graphviz images to page
 * #4617: quickstart: PROJECT_DIR argument is required
 
 Testing
diff --git a/sphinx/ext/graphviz.py b/sphinx/ext/graphviz.py
index 2986bf9c1..08707b733 100644
--- a/sphinx/ext/graphviz.py
+++ b/sphinx/ext/graphviz.py
@@ -341,7 +341,7 @@ def render_dot_latex(self, node, code, options, prefix='graphviz'):
                 post = r'\hspace*{\fill}}'
         self.body.append('\n%s' % pre)
 
-    self.body.append(r'\includegraphics{%s}' % fname)
+    self.body.append(r'\sphinxincludegraphics[]{%s}' % fname)
 
     if not is_inline:
         self.body.append('%s\n' % post)
diff --git a/sphinx/templates/epub3/content.opf_t b/sphinx/templates/epub3/content.opf_t
index faabc86df..c201e49d6 100644
--- a/sphinx/templates/epub3/content.opf_t
+++ b/sphinx/templates/epub3/content.opf_t
@@ -11,7 +11,7 @@
     <dc:contributor>{{ contributor }}</dc:contributor>
     <dc:publisher>{{ publisher }}</dc:publisher>
     <dc:rights>{{ copyright }}</dc:rights>
-    <dc:identifier id="{{ uid }}">{{ id }}</dc:identifier>
+    <dc:identifier id="{{ uid }}" opf:scheme="{{ scheme }}">{{ id }}</dc:identifier>
     <dc:date>{{ date }}</dc:date>
     <meta property="dcterms:modified">{{ date }}</meta>
     <meta property="ibooks:version">{{ version }}</meta>
diff --git a/tests/test_build_latex.py b/tests/test_build_latex.py
index af4b771d8..1057a6867 100644
--- a/tests/test_build_latex.py
+++ b/tests/test_build_latex.py
@@ -767,7 +767,8 @@ def test_image_in_section(app, status, warning):
     assert ('\\chapter{Another section}' in result)
 
 
-@pytest.mark.sphinx('latex', confoverrides={'latex_logo': 'notfound.jpg'})
+@pytest.mark.sphinx('latex', testroot='basic',
+                    confoverrides={'latex_logo': 'notfound.jpg'})
 def test_latex_logo_if_not_found(app, status, warning):
     try:
         app.builder.build_all()
diff --git a/tests/test_ext_graphviz.py b/tests/test_ext_graphviz.py
index ef77135d7..3efab6b56 100644
--- a/tests/test_ext_graphviz.py
+++ b/tests/test_ext_graphviz.py
@@ -91,20 +91,20 @@ def test_graphviz_latex(app, status, warning):
 
     content = (app.outdir / 'SphinxTests.tex').text()
     macro = ('\\\\begin{figure}\\[htbp\\]\n\\\\centering\n\\\\capstart\n\n'
-             '\\\\includegraphics{graphviz-\\w+.pdf}\n'
+             '\\\\sphinxincludegraphics\\[\\]{graphviz-\\w+.pdf}\n'
              '\\\\caption{caption of graph}\\\\label{.*}\\\\end{figure}')
     assert re.search(macro, content, re.S)
 
-    macro = 'Hello \\\\includegraphics{graphviz-\\w+.pdf} graphviz world'
+    macro = 'Hello \\\\sphinxincludegraphics\\[\\]{graphviz-\\w+.pdf} graphviz world'
     assert re.search(macro, content, re.S)
 
     macro = ('\\\\begin{wrapfigure}{r}{0pt}\n\\\\centering\n'
-             '\\\\includegraphics{graphviz-\\w+.pdf}\n'
+             '\\\\sphinxincludegraphics\\[\\]{graphviz-\\w+.pdf}\n'
              '\\\\caption{on right}\\\\label{.*}\\\\end{wrapfigure}')
     assert re.search(macro, content, re.S)
 
     macro = (r'\{\\hfill'
-             r'\\includegraphics{graphviz-.*}'
+             r'\\sphinxincludegraphics\[\]{graphviz-.*}'
              r'\\hspace\*{\\fill}}')
     assert re.search(macro, content, re.S)
 
diff --git a/tests/test_ext_inheritance_diagram.py b/tests/test_ext_inheritance_diagram.py
index ed79729e6..ad106e6c6 100644
--- a/tests/test_ext_inheritance_diagram.py
+++ b/tests/test_ext_inheritance_diagram.py
@@ -40,7 +40,7 @@ def test_inheritance_diagram_latex(app, status, warning):
     content = (app.outdir / 'Python.tex').text()
 
     pattern = ('\\\\begin{figure}\\[htbp]\n\\\\centering\n\\\\capstart\n\n'
-               '\\\\includegraphics{inheritance-\\w+.pdf}\n'
+               '\\\\sphinxincludegraphics\\[\\]{inheritance-\\w+.pdf}\n'
                '\\\\caption{Test Foo!}\\\\label{\\\\detokenize{index:id1}}\\\\end{figure}')
     assert re.search(pattern, content, re.M)