diff --git a/adr_viewer/__init__.py b/adr_viewer/__init__.py
index 6cc65b9..f3efb2e 100644
--- a/adr_viewer/__init__.py
+++ b/adr_viewer/__init__.py
@@ -25,8 +25,8 @@ def generate_content(path, template_dir_override=None, title=None) -> str:
     }
 
     for index, adr_file in enumerate(files):
-
-        adr_attributes = parse_adr(adr_file)
+        markdown = open(adr_file).read()
+        adr_attributes = parse_adr(markdown)
 
         if adr_attributes:
             adr_attributes.index = index
diff --git a/adr_viewer/parse.py b/adr_viewer/parse.py
index b4b359b..9b51512 100644
--- a/adr_viewer/parse.py
+++ b/adr_viewer/parse.py
@@ -29,8 +29,8 @@ def extract_statuses_from_adr(page_object) -> Iterator[str]:
                 continue
 
 
-def parse_adr(path) -> Optional[Adr]:
-    adr_as_html = mistune.markdown(open(path).read())
+def parse_adr(content: str) -> Optional[Adr]:
+    adr_as_html = mistune.markdown(content)
 
     soup = BeautifulSoup(adr_as_html, features='html.parser')
 
diff --git a/adr_viewer/test_parse.py b/adr_viewer/test_parse.py
index 9783070..eca25ae 100644
--- a/adr_viewer/test_parse.py
+++ b/adr_viewer/test_parse.py
@@ -2,54 +2,63 @@
 
 
 def test_should_extract_title_from_record():
-    adr = parse_adr('doc/adr/0001-record-architecture-decisions.md')
+    markdown = open('doc/adr/0001-record-architecture-decisions.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.title == '1. Record architecture decisions'
 
 
 def test_should_extract_status_from_record():
-    adr = parse_adr('doc/adr/0001-record-architecture-decisions.md')
+    markdown = open('doc/adr/0001-record-architecture-decisions.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'accepted'
 
 
-def test_should_include_adr_as_html():
-    adr = parse_adr('doc/adr/0001-record-architecture-decisions.md')
+def test_should_include_adr_as_markdown():
+    markdown = open('doc/adr/0001-record-architecture-decisions.md').read()
+    adr = parse_adr(markdown)
 
     assert '<h1>1. Record architecture decisions</h1>' in adr.body
 
 
 def test_should_mark_superseded_records():
-    adr = parse_adr('doc/adr/0003-use-same-colour-for-all-headers.md')
+    markdown = open('doc/adr/0003-use-same-colour-for-all-headers.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'superseded'
 
 
 def test_should_mark_amended_records():
-    adr = parse_adr('doc/adr/0004-distinguish-superseded-records-with-colour.md')
+    markdown = open('doc/adr/0004-distinguish-superseded-records-with-colour.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'amended'
 
 
 def test_should_mark_unknown_records():
-    adr = parse_adr('test/adr/0001-unknown-status.md')
+    markdown = open('test/adr/0001-unknown-status.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'unknown'
 
 
 def test_should_mark_pending_records():
-    adr = parse_adr('test/adr/0002-pending-status.md')
+    markdown = open('test/adr/0002-pending-status.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'pending'
 
 
 def test_should_mark_pproposed_records():
-    adr = parse_adr('test/adr/0004-proposed-status.md')
+    markdown = open('test/adr/0004-proposed-status.md').read()
+    adr = parse_adr(markdown)
 
     assert adr.status == 'pending'
 
 
 def test_should_ignore_invalid_files():
-    adr = parse_adr('test/adr/0003-bad-formatting.md')
+    markdown = open('test/adr/0003-bad-formatting.md').read()
+    adr = parse_adr(markdown)
 
     assert adr is None