diff --git a/tests/syntax-tests/create_highlighted_versions.py b/tests/syntax-tests/create_highlighted_versions.py
index c03a0742..b82cc8cd 100755
--- a/tests/syntax-tests/create_highlighted_versions.py
+++ b/tests/syntax-tests/create_highlighted_versions.py
@@ -16,6 +16,17 @@ BAT_OPTIONS = [
     "--italic-text=always",
 ]
 
+SKIP_FILENAMES = [
+    "LICENSE.md",
+    "README.md",
+    "bat_options",
+]
+
+
+def get_extra_options(source):
+    with open(path.join(source, "bat_options"), "r") as f:
+        return list(map(lambda x: x.rstrip(), f.readlines()))
+
 
 def create_highlighted_versions(output_basepath):
     root = os.path.dirname(os.path.abspath(__file__))
@@ -31,16 +42,23 @@ def create_highlighted_versions(output_basepath):
             env.pop("BAT_TABS", None)
             env["COLORTERM"] = "truecolor"  # make sure to output 24bit colors
 
-            bat_output = subprocess.check_output(
-                ["bat"] + BAT_OPTIONS + [source], stderr=subprocess.PIPE, env=env,
-            )
-
-            source_dirname = path.basename(path.dirname(source))
+            source_dirpath = path.dirname(source)
+            source_dirname = path.basename(source_dirpath)
             source_filename = path.basename(source)
 
-            if source_filename == "LICENSE.md":
+            if source_filename in SKIP_FILENAMES:
                 continue
 
+            options = BAT_OPTIONS.copy()
+            # If a directory is empty, `files` could possibly be 0-length
+            if path.exists(path.join(source_dirpath, "bat_options")):
+                options += get_extra_options(source_dirpath)
+
+            bat_output = subprocess.check_output(
+                ["bat"] + options + [source],
+                stderr=subprocess.PIPE, env=env,
+            )
+
             output_dir = path.join(output_basepath, source_dirname)
             output_path = path.join(output_dir, source_filename)
 
diff --git a/tests/syntax-tests/highlighted/Plaintext/plaintext.txt b/tests/syntax-tests/highlighted/Plaintext/plaintext.txt
new file mode 100644
index 00000000..807728e1
--- /dev/null
+++ b/tests/syntax-tests/highlighted/Plaintext/plaintext.txt
@@ -0,0 +1,178 @@
+␀␊
+\u{1}␊
+\u{2}␊
+\u{3}␊
+\u{4}␊
+\u{5}␊
+\u{6}␊
+␇␊
+␈␊
+├──┤␊
+␊
+␊
+\u{b}␊
+\u{c}␊
+␊
+\u{e}␊
+\u{f}␊
+\u{10}␊
+\u{11}␊
+\u{12}␊
+\u{13}␊
+\u{14}␊
+\u{15}␊
+\u{16}␊
+\u{17}␊
+\u{18}␊
+\u{19}␊
+\u{1a}␊
+␛␊
+\u{1c}␊
+\u{1d}␊
+\u{1e}␊
+\u{1f}␊
+·␊
+!␊
+"␊
+#␊
+$␊
+%␊
+&␊
+'␊
+(␊
+)␊
+*␊
++␊
+,␊
+-␊
+.␊
+/␊
+0␊
+1␊
+2␊
+3␊
+4␊
+5␊
+6␊
+7␊
+8␊
+9␊
+:␊
+;␊
+<␊
+=␊
+>␊
+?␊
+@␊
+A␊
+B␊
+C␊
+D␊
+E␊
+F␊
+G␊
+H␊
+I␊
+J␊
+K␊
+L␊
+M␊
+N␊
+O␊
+P␊
+Q␊
+R␊
+S␊
+T␊
+U␊
+V␊
+W␊
+X␊
+Y␊
+Z␊
+[␊
+\␊
+]␊
+^␊
+_␊
+`␊
+a␊
+b␊
+c␊
+d␊
+e␊
+f␊
+g␊
+h␊
+i␊
+j␊
+k␊
+l␊
+m␊
+n␊
+o␊
+p␊
+q␊
+r␊
+s␊
+t␊
+u␊
+v␊
+w␊
+x␊
+y␊
+z␊
+{␊
+|␊
+}␊
+~␊
+\u{7f}␊
+\u{80}␊
+\u{81}␊
+\u{82}␊
+\u{83}␊
+\u{84}␊
+\u{85}␊
+\u{86}␊
+\u{87}␊
+\u{88}␊
+\u{89}␊
+\u{8a}␊
+\u{8b}␊
+\u{8c}␊
+\u{8d}␊
+\u{8e}␊
+\u{8f}␊
+\u{90}␊
+\u{91}␊
+\u{92}␊
+\u{93}␊
+\u{94}␊
+\u{95}␊
+\u{96}␊
+\u{97}␊
+\u{98}␊
+\u{99}␊
+\u{9a}␊
+\u{9b}␊
+\u{9c}␊
+\u{9d}␊
+\u{9e}␊
+\u{9f}␊
+\u{a0}␊
+\u{a1}␊
+\u{a2}␊
+\u{a3}␊
+\u{a4}␊
+\u{a5}␊
+\u{a6}␊
+\u{a7}␊
+\u{a8}␊
+\u{a9}␊
+\u{aa}␊
+\u{ab}␊
+\u{ac}␊
+\u{ad}␊
+\u{ae}␊
+␊
+Here's·a·line·with·multiple·characters.
diff --git a/tests/syntax-tests/source/Plaintext/README.md b/tests/syntax-tests/source/Plaintext/README.md
new file mode 100644
index 00000000..95679324
--- /dev/null
+++ b/tests/syntax-tests/source/Plaintext/README.md
@@ -0,0 +1,10 @@
+This text file was generated with the following script. Certain invalid characters were removed manually:
+
+```python
+with open("plaintext.txt", "w"):
+    for i in range(0x10FFFF):
+        try:
+            f.write(chr(i) + "\n")
+        except:
+            pass
+```
diff --git a/tests/syntax-tests/source/Plaintext/bat_options b/tests/syntax-tests/source/Plaintext/bat_options
new file mode 100644
index 00000000..e5dd9b4e
--- /dev/null
+++ b/tests/syntax-tests/source/Plaintext/bat_options
@@ -0,0 +1 @@
+--show-all
diff --git a/tests/syntax-tests/source/Plaintext/plaintext.txt b/tests/syntax-tests/source/Plaintext/plaintext.txt
new file mode 100644
index 00000000..42da1207
Binary files /dev/null and b/tests/syntax-tests/source/Plaintext/plaintext.txt differ