diff --git a/src/diffenator2/data/test_strings.json b/src/diffenator2/data/test_strings.json
new file mode 100644
index 0000000..0e15c7d
--- /dev/null
+++ b/src/diffenator2/data/test_strings.json
@@ -0,0 +1,110 @@
+{
+    "GF_Latin_Core": {
+        "Letter Groups": [
+            {
+                "string": "EFHIJLTU AVWXZ KMNY",
+                "lang": "en"
+            },
+            {
+                "string": "COQS BPRDGÞẞ",
+                "lang": "en"
+            },
+            {
+                "string": "hmnu ceogðsß abdpqþ",
+                "lang": "en"
+            },
+            {
+                "string": "kvwxyz fijltr",
+                "lang": "en"
+            },
+            {
+                "string": "0123456789",
+                "lang": "en"
+            },
+            {
+                "string": ".,:;/|?!-–—&@%([{}])°",
+                "lang": "en"
+            },
+            {
+                "string": "+−×÷=≠><≥≤±≈~¬∞",
+                "lang": "en"
+            }
+        ],
+        "Spacing": [
+            {
+                "string": "HHOHHOOHOO HIHOIO",
+                "lang": "en"
+            },
+            {
+                "string": "uuonouonoo ninoioolonlniuo",
+                "lang": "en"
+            },
+            {
+                "string": "010 080 030 020 050 060 070",
+                "lang": "en"
+            },
+            {
+                "string": "3+4=7 5>2 2x²−(8×7)÷9≈1",
+                "lang": "en"
+            },
+            {
+                "string": "L·L l·l",
+                "lang": "ca"
+            }
+        ],
+        "Kerning": [
+            {
+                "string": "HHAVAHH OXOWAFAPATAUAYAÞYLYTJLVÆAVAOYO HH",
+                "lang": "en"
+            },
+            {
+                "string": "Ti Tí Tî Tï Tì Tī Vă Tä Tü Tõ Tŭ Tř",
+                "lang": "en"
+            },
+            {
+                "string": "HHTan oTo yTy vAv oVo oWo eYe Ly Ky Ac Ay gj",
+                "lang": "en"
+            },
+            {
+                "string": "nin non nvn ovo oxo ayn fl fi fj ft gj ko rento",
+                "lang": "en"
+            },
+            {
+                "string": "ďá ďu gj ľk włw yły ółr fħ ílïlîl",
+                "lang": "en"
+            },
+            {
+                "string": "H.Y-Y.T,F.P,V:Y„V-T-A*A’A“A’A-AL–L—L-",
+                "lang": "en"
+            },
+            {
+                "string": "n.r.r,y.y,(o)(i)(d)(j)(f)[j]{f}",
+                "lang": "en"
+            },
+            {
+                "string": "¿o,O? w@y «n•n» n*",
+                "lang": "en"
+            },
+            {
+                "string": "080 076 474 973 94 7078 54 24 272 679",
+                "lang": "en"
+            },
+            {
+                "string": "P4T47A .47,9.7-»4",
+                "lang": "en"
+            },
+            {
+                "string": "42°21′29″N 71°03′49″W",
+                "lang": "en"
+            },
+            {
+                "string": "d² m³ 15°C/26°F",
+                "lang": "en"
+            },
+            {
+                "string": "0/0\\0",
+                "lang": "en"
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/src/diffenator2/html.py b/src/diffenator2/html.py
index e25530d..814457a 100644
--- a/src/diffenator2/html.py
+++ b/src/diffenator2/html.py
@@ -6,8 +6,7 @@
 import os
 import shutil
 from diffenator2.template_elements import CSSFontStyle, CSSFontFace
-from diffenator2.utils import font_sample_text, characters_in_string
-from glyphsets import GFTestData
+from diffenator2.utils import font_sample_text, characters_in_string, GFTestData
 import re
 from pathlib import Path
 from diffenator2.shape import parse_wordlist
diff --git a/src/diffenator2/utils.py b/src/diffenator2/utils.py
index de153df..f9e0ef3 100644
--- a/src/diffenator2/utils.py
+++ b/src/diffenator2/utils.py
@@ -27,6 +27,10 @@
 from zipfile import ZipFile
 import re
 import json
+from glyphsets import get_glyphsets_fulfilled
+
+
+TEST_STRINGS_DATA = os.path.join(os.path.dirname(__file__), "data", "test_strings.json")
 
 
 def dict_coords_to_string(coords: dict[str, float]) -> str:
@@ -195,3 +199,27 @@ def re_filter_characters(font, pattern):
 
 def characters_in_string(string, characters):
     return all(g in characters for g in string)
+
+
+
+class _TestDocData:
+    def __init__(
+        self,
+        data=json.load(open(TEST_STRINGS_DATA, encoding="utf8")),
+    ):
+        self._data = data
+
+    def test_strings_in_font(self, ttFont, threshold=0.95):
+        res = {}
+        glyphsets_in_font = get_glyphsets_fulfilled(ttFont)
+        for glyphset, coverage in glyphsets_in_font.items():
+            if coverage["percentage"] < threshold:
+                continue
+            test_strings = self._data.get(glyphset)
+            if not test_strings:
+                continue
+            res[glyphset] = test_strings
+        return res
+
+
+GFTestData = _TestDocData()