diff --git a/src/standard_names/cmd/sndump.py b/src/standard_names/cmd/sndump.py
index c7c79d5..0d79a12 100644
--- a/src/standard_names/cmd/sndump.py
+++ b/src/standard_names/cmd/sndump.py
@@ -17,28 +17,6 @@ def main(argv: tuple[str] | None = None) -> int:
     ----------
     args : iterable of str, optional
         Arguments to pass to *parse_args*. If not provided, use ``sys.argv``.
-
-    Examples
-    --------
-    >>> import os
-    >>> from standard_names.registry import NamesRegistry
-    >>> from standard_names.registry import _get_latest_names_file
-    >>> from standard_names.cmd.sndump import main
-
-    >>> (fname, _) = _get_latest_names_file()
-    >>> registry = NamesRegistry.from_path(fname)
-
-    >>> names = main(['-n', fname]).split(os.linesep)
-    >>> len(names) == len(registry)
-    True
-
-    >>> objects = main(['-o', fname]).split(os.linesep)
-    >>> len(objects) == len(registry.objects)
-    True
-
-    >>> names = main(['-n', '-o', fname]).split(os.linesep)
-    >>> len(names) == len(registry) + len(registry.objects)
-    True
     """
     VALID_FIELDS = {
         "op": "operators",
diff --git a/src/standard_names/cmd/snscrape.py b/src/standard_names/cmd/snscrape.py
index c5e6117..7dc2031 100644
--- a/src/standard_names/cmd/snscrape.py
+++ b/src/standard_names/cmd/snscrape.py
@@ -9,53 +9,59 @@
     > data/scraped.yaml
 ```
 """
-
+import argparse
 from collections.abc import Iterable
 
 from standard_names.registry import NamesRegistry
 
 
 def main(argv: tuple[str] | None = None) -> int:
+    parser = argparse.ArgumentParser("Scrape standard names from a file or URL")
+    parser.add_argument("file", nargs="*", metavar="FILE", help="URL or file to scrape")
+
+    args = parser.parse_args(argv)
+
+    registry = scrape_names(args.file)
+    print(registry.dumps(format_="text", fields=("names",)))
+
+    return 0
+
+
+def scrape_names(files: Iterable[str]) -> NamesRegistry:
     """Scrape standard names from a file or URL.
 
+    Parameters
+    ----------
+    files : iterable of str
+        Files to search for names.
+
+    Returns
+    -------
+    NamesRegistry
+        A registry of the names found in the files.
+
     Examples
     --------
-    >>> import os
     >>> import tempfile
-    >>> import standard_names as csn
+    >>> from standard_names.cmd.snscrape import scrape_names
 
-    >>> contents = \"\"\"
+    >>> contents = '''
     ... A file with text and names (air__temperature) mixed in. Some names
     ... have double underscores (like, Water__Temperature) by are not
     ... valid names. Others, like water__temperature, are good.
-    ... \"\"\"
+    ... '''
 
-    >>> (fd, fname) = tempfile.mkstemp()
-    >>> os.close(fd)
-
-    >>> with open(fname, 'w') as fp:
+    >>> with tempfile.NamedTemporaryFile("w") as fp:
     ...     print(contents, file=fp)
-
-    >>> names = csn.cmd.snscrape.main(
-    ...     [fp.name, '--reader=plain_text', '--no-headers'])
-    >>> names.split(os.linesep)
+    ...     _ = fp.seek(0)
+    ...     registry = scrape_names([fp.name])
+    >>> sorted(registry.names)
     ['air__temperature', 'water__temperature']
-
-    >>> os.remove(fname)
     """
-    import argparse
-
-    parser = argparse.ArgumentParser("Scrape standard names from a file or URL")
-    parser.add_argument("file", nargs="*", metavar="FILE", help="URL or file to scrape")
-
-    args = parser.parse_args(argv)
-
     registry = NamesRegistry([])
-    for file in args.file:
+    for file in files:
         registry |= NamesRegistry(search_file_for_names(file))
-    print(registry.dumps(format_="text", fields=("names",)))
-
-    return 0
+    return registry
 
 
 def find_all_names(lines: Iterable[str], engine: str = "peg") -> set[str]:
diff --git a/src/standard_names/cmd/snvalidate.py b/src/standard_names/cmd/snvalidate.py
index 2564560..4e5c042 100644
--- a/src/standard_names/cmd/snvalidate.py
+++ b/src/standard_names/cmd/snvalidate.py
@@ -3,39 +3,14 @@
 
 import argparse
 import os
-import sys
+from collections.abc import Iterator
 
 from standard_names.error import BadRegistryError
 from standard_names.registry import NamesRegistry
 
 
 def main(argv: tuple[str] | None = None) -> int:
-    """Validate a list of names.
-
-    Examples
-    --------
-    >>> import os
-    >>> from standard_names.registry import _get_latest_names_file
-    >>> from standard_names.cmd.snvalidate import main
-
-    >>> (fname, _) = _get_latest_names_file()
-    >>> main([fname])
-    0
-
-    >>> import tempfile
-    >>> (fd, fname) = tempfile.mkstemp()
-    >>> os.close(fd)
-
-    >>> with open(fname, 'w') as fp:
-    ...     print('air__temperature', file=fp)
-    ...     print('Water__temperature', file=fp)
-    ...     print('water_temperature', file=fp)
-
-    >>> main([fp.name])
-    2
-
-    >>> os.remove(fname)
-    """
+    """Validate a list of names."""
     parser = argparse.ArgumentParser("Validate a list of standard names")
 
     parser.add_argument(
@@ -47,14 +22,48 @@ def main(argv: tuple[str] | None = None) -> int:
 
     args = parser.parse_args(argv)
 
-    error_count = 0
+    invalid_names = set()
     for file in args.file:
-        try:
-            NamesRegistry(file)
-        except BadRegistryError as err:
-            print(os.linesep.join(err.names), file=sys.stderr)
-            error_count += len(err.names)
-    return error_count
+        invalid_names |= validate_names(file)
+
+    print(os.linesep.join(invalid_names))
+
+    return len(invalid_names)
+
+
+def validate_names(names: Iterator[str]) -> set[str]:
+    """Find invalid names.
+
+    Examples
+    --------
+    >>> import os
+    >>> import tempfile
+    >>> from standard_names.registry import _get_latest_names_file
+    >>> from standard_names.cmd.snvalidate import validate_names
+
+    >>> (fname, _) = _get_latest_names_file()
+    >>> with open(fname) as fp:
+    ...     invalid_names = validate_names(fp)
+    >>> len(invalid_names)
+    0
+
+    >>> names = [
+    ...     "air__temperature",
+    ...     "Water__temperature",
+    ...     "water_temperature",
+    ... ]
+    >>> invalid_names = validate_names(names)
+    >>> sorted(invalid_names)
+    ['Water__temperature', 'water_temperature']
+    """
+    try:
+        NamesRegistry(names)
+    except BadRegistryError as err:
+        invalid_names = set(err.names)
+    else:
+        invalid_names = set()
+
+    return invalid_names
 
 
 if __name__ == "__main__":