Fix pretty-printing nested empty lists and add test suite

The earlier "test" was just hitting the code without actually checking the
output.  This new suite is a set of pretty-printed documents which serd must
reproduce from a model exactly to pass.  This should make it easy to add cases
in the future, since each case is just a document, as it should look.

1 files changed, 153 insertions, 0 deletions

diff --git a/test/run_pretty_suite.py b/test/run_pretty_suite.py
new file mode 100755
index 00000000..a17dd0f8
--- /dev/null
+++ b/test/run_pretty_suite.py
@@ -0,0 +1,153 @@
+#!/usr/bin/env python3
+
+"""Run the RDF-based test suite for serd-filter."""
+
+import serd_test_util
+
+import argparse
+import datetime
+import difflib
+import itertools
+import os
+import re
+import shlex
+import subprocess
+import sys
+import tempfile
+import urllib.parse
+
+
+def log_error(message):
+    """Log an error message to stderr"""
+
+    sys.stderr.write("error: ")
+    sys.stderr.write(message)
+
+
+def _uri_path(test_dir, uri):
+    path = urllib.parse.urlparse(uri).path
+    drive = os.path.splitdrive(path[1:])[0]
+    path = path if not drive else path[1:]
+    return os.path.join(test_dir, os.path.basename(path))
+
+
+def test_suite(
+    manifest_path,
+    base_uri,
+    command_prefix,
+    out_dir,
+):
+    """Run all tests in the manifest."""
+
+    mf = "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#"
+    suite_dir = os.path.dirname(manifest_path)
+
+    model, instances = serd_test_util.load_rdf(
+        command_prefix + ["-B", base_uri], manifest_path
+    )
+
+    os.makedirs(out_dir, exist_ok=True)
+
+    class Results:
+        def __init__(self):
+            self.n_tests = 0
+            self.n_failures = 0
+
+    def run_test(entry, results):
+        """Run a single test entry from the manifest."""
+
+        input_uri = model[entry][mf + "action"][0]
+        input_path = _uri_path(suite_dir, input_uri)
+
+        output_path = os.path.join(out_dir, os.path.basename(input_path))
+
+        command = command_prefix + [
+            "-B",
+            base_uri,
+            "-O",
+            "turtle",
+            "-o",
+            output_path,
+            input_path,
+        ]
+
+        # Read the flat input and pretty-print output
+        results.n_tests += 1
+        try:
+            subprocess.run(command, check=True)
+
+            # Check that the output is exactly the same as the expected result
+            if not serd_test_util.file_equals(input_path, output_path):
+                results.n_failures += 1
+                log_error(
+                    "Output {} differs from {}\n".format(
+                        output_path, input_path
+                    )
+                )
+
+        except Exception as e:
+            log_error(str(e))
+            results.n_failures += 1
+
+    # Run all test types in the test suite
+    results = Results()
+    for klass, instances in instances.items():
+        if klass == "http://drobilla.net/ns/serd#TestTurtlePrint":
+            for entry in instances:
+                run_test(entry, results)
+
+    # Print result summary
+    if results.n_failures > 0:
+        log_error(
+            "{}/{} tests failed\n".format(results.n_failures, results.n_tests)
+        )
+    else:
+        sys.stdout.write("All {} tests passed\n".format(results.n_tests))
+
+    return results.n_failures
+
+
+def main():
+    """Run the command line tool."""
+
+    parser = argparse.ArgumentParser(
+        usage="%(prog)s [OPTION]... MANIFEST -- [TOOL_OPTION]...",
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+
+    parser.add_argument("--tool", default="tools/serd-sort", help="executable")
+    parser.add_argument("--wrapper", default="", help="executable wrapper")
+
+    parser.add_argument(
+        "-o", "--out-dir", default="test/pretty", help="output directory"
+    )
+
+    parser.add_argument(
+        "--base-uri",
+        default="http://drobilla.net/sw/serd/test/",
+        help="base URI",
+    )
+    parser.add_argument("manifest", help="test suite manifest.ttl file")
+
+    args = parser.parse_args(sys.argv[1:])
+    wrapper_prefix = shlex.split(args.wrapper)
+    command_prefix = wrapper_prefix + [args.tool]
+
+    return test_suite(
+        args.manifest,
+        args.base_uri,
+        command_prefix,
+        args.out_dir,
+    )
+
+
+if __name__ == "__main__":
+    try:
+        sys.exit(main())
+    except subprocess.CalledProcessError as e:
+        if e.stderr is not None:
+            sys.stderr.write(e.stderr.decode("utf-8"))
+
+        sys.stderr.write("error: %s\n" % e)
+        sys.exit(e.returncode)