addons/namingng.py: Add unit test for standalone mode.

This reuses the existing unit test, running the addon on the dump file created.

The format of the standalone mode is different so the expected output is
slightly transformed before checking.

This implicitly also tests `cppcheck --dump`, i.e. whether checking 1 file
leads to 1 dump file, and whether the dump filename is indeed file+'.dump'.
This is relevant as some code simply assumes this to be the case.

test/cli/test-other.py

@@ -2,10 +2,12 @@
 # python -m pytest test-other.py
 
 import os
+from glob import glob
+import re
 import sys
 import pytest
 
-from testutils import cppcheck, assert_cppcheck
+from testutils import cppcheck, assert_cppcheck, addon_standalone
 
 
 def __test_missing_include(tmpdir, use_j):
@@ -325,17 +327,18 @@ def test_addon_naming(tmpdir):
 
 
 def test_addon_namingng(tmpdir):
+    addon_py = 'namingng.py'
     addon_file = os.path.join(tmpdir, 'namingng.json')
     addon_config_file = os.path.join(tmpdir, 'namingng.config.json')
     with open(addon_file, 'wt') as f:
         f.write("""
 {
-    "script": "addons/namingng.py",
+    "script": "addons/%s",
     "args": [
         "--configfile=%s"
     ]
 }
-                """%(addon_config_file).replace('\\','\\\\'))
+                """%(addon_py,addon_config_file.replace('\\','\\\\')))
 
     with open(addon_config_file, 'wt') as f:
         f.write("""
@@ -424,7 +427,7 @@ class _clz {
 namespace _invalid_namespace { }
         """%(test_include_file_basename))
 
-    args = ['--addon='+addon_file, '--verbose', '--enable=all', test_file]
+    args = ['--addon='+addon_file, '--dump', '--verbose', '--enable=all', test_file]
 
     exitcode, stdout, stderr = cppcheck(args)
     assert exitcode == 0
@@ -505,6 +508,32 @@ class _clz {
     expect.sort()
     assert lines == expect
 
+    # Perform same analysis again, but now in standalone mode.
+    dump_files = glob(os.path.join(tmpdir,'*.dump'))
+    assert len(dump_files) == 1
+
+    dump_file = dump_files[0]
+    assert dump_file == test_file+'.dump'
+
+    args = ['--configfile='+addon_config_file,dump_file]
+    exitcode, stdout, stderr = addon_standalone(addon_py,args)
+    assert exitcode == 0
+    lines = stdout.splitlines()
+    assert lines == [
+        'Checking {}...'.format(dump_file),
+        'Checking config ...',
+    ]
+
+    # Trim column information and adapt to standalone output format.
+    lines = [line for line in stderr.splitlines() if line != '']
+    def standaloneize(line):
+        pat = '([^:]+):([0-9]+):[0-9]+: ([^:]+): (.*)'
+        repl = '[\\1:\\2] (\\3) \\4'
+        return re.sub(pat,repl,line,1)
+    expect_standalone = [standaloneize(line) for line in lines if line.strip() != '^']
+    lines.sort()
+    expect_standalone.sort()
+    assert lines == expect_standalone
 
 def test_addon_namingng_config(tmpdir):
     addon_file = os.path.join(tmpdir, 'namingng.json')