--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_spikes.py	Mon Sep 15 11:37:51 2025 +0200
@@ -0,0 +1,42 @@
+import pymupdf
+import pathlib
+import os
+
+
+def test_spikes():
+    """Check suppression of text spikes caused by long miters."""
+    root = os.path.abspath(f"{__file__}/../..")
+    spikes_yes = pathlib.Path(f"{root}/docs/images/spikes-yes.png")
+    spikes_no = pathlib.Path(f"{root}/docs/images/spikes-no.png")
+    doc = pymupdf.open()
+    text = "NATO MEMBERS"  # some text provoking spikes ("N", "M")
+    point = (10, 35)  # insert point
+
+    # make text provoking spikes
+    page = doc.new_page(width=200, height=50)  # small page
+    page.insert_text(
+        point,
+        text,
+        fontsize=20,
+        render_mode=1,  # stroke text only
+        border_width=0.3,  # causes thick border lines
+        miter_limit=None,  # do not care about miter spikes
+    )
+    # write same text in white over the previous for better demo purpose
+    page.insert_text(point, text, fontsize=20, color=(1, 1, 1))
+    pix1 = page.get_pixmap()
+    assert pix1.tobytes() == spikes_yes.read_bytes()
+
+    # make text suppressing spikes
+    page = doc.new_page(width=200, height=50)
+    page.insert_text(
+        point,
+        text,
+        fontsize=20,
+        render_mode=1,
+        border_width=0.3,
+        miter_limit=1,  # suppress each and every miter spike
+    )
+    page.insert_text(point, text, fontsize=20, color=(1, 1, 1))
+    pix2 = page.get_pixmap()
+    assert pix2.tobytes() == spikes_no.read_bytes()