diff --git a/addons/findcasts.py b/addons/findcasts.py
index 41fbf2d9b..d4842b229 100755
--- a/addons/findcasts.py
+++ b/addons/findcasts.py
@@ -4,7 +4,6 @@
 #
 
 import cppcheck
-import sys
 
 @cppcheck.checker
 def cast(cfg, data):
diff --git a/addons/y2038.py b/addons/y2038.py
index 2c3856c5d..7c8f409dc 100755
--- a/addons/y2038.py
+++ b/addons/y2038.py
@@ -16,7 +16,6 @@ from __future__ import print_function
 
 import cppcheckdata
 import sys
-import os
 import re
 
 
diff --git a/test/cli/test-other.py b/test/cli/test-other.py
index e4641d6e3..d79f25101 100644
--- a/test/cli/test-other.py
+++ b/test/cli/test-other.py
@@ -255,10 +255,14 @@ def test_addon_y2038(tmpdir):
     # TODO: trigger warning
     with open(test_file, 'wt') as f:
         f.write("""
-typedef int MISRA_5_6_VIOLATION;
+extern void f()
+{
+    time_t t = std::time(nullptr);
+    (void)t;
+}
         """)
 
-    args = ['--addon=y2038', '--enable=all', test_file]
+    args = ['--addon=y2038', '--enable=all', '--template={file}:{line}:{column}: {severity}:{inconclusive:inconclusive:} {message} [{id}]', test_file]
 
     exitcode, stdout, stderr = cppcheck(args)
     assert exitcode == 0
@@ -266,18 +270,20 @@ typedef int MISRA_5_6_VIOLATION;
     assert lines == [
         'Checking {} ...'.format(test_file)
     ]
-    assert stderr == ''
+    assert stderr == '{}:4:21: warning: time is Y2038-unsafe [y2038-unsafe-call]\n'.format(test_file)
 
 
 def test_addon_threadsafety(tmpdir):
     test_file = os.path.join(tmpdir, 'test.cpp')
-    # TODO: trigger warning
     with open(test_file, 'wt') as f:
         f.write("""
-typedef int MISRA_5_6_VIOLATION;
+extern const char* f()
+{
+    return strerror(1);
+}
         """)
 
-    args = ['--addon=y2038', '--enable=all', test_file]
+    args = ['--addon=threadsafety', '--enable=all', '--template={file}:{line}:{column}: {severity}:{inconclusive:inconclusive:} {message} [{id}]', test_file]
 
     exitcode, stdout, stderr = cppcheck(args)
     assert exitcode == 0
@@ -285,18 +291,29 @@ typedef int MISRA_5_6_VIOLATION;
     assert lines == [
         'Checking {} ...'.format(test_file)
     ]
-    assert stderr == ''
+    assert stderr == '{}:4:12: warning: strerror is MT-unsafe [threadsafety-unsafe-call]\n'.format(test_file)
 
 
 def test_addon_naming(tmpdir):
+    # the addon does nothing without a config
+    addon_file = os.path.join(tmpdir, 'naming1.json')
+    with open(addon_file, 'wt') as f:
+        f.write("""
+{
+    "script": "addons/naming.py",
+    "args": [
+        "--var=[_a-z].*"
+    ]
+}
+                """)
+
     test_file = os.path.join(tmpdir, 'test.cpp')
-    # TODO: trigger warning
     with open(test_file, 'wt') as f:
         f.write("""
-typedef int MISRA_5_6_VIOLATION;
+int Var;
         """)
 
-    args = ['--addon=y2038', '--enable=all', test_file]
+    args = ['--addon={}'.format(addon_file), '--enable=all', '--template={file}:{line}:{column}: {severity}:{inconclusive:inconclusive:} {message} [{id}]', test_file]
 
     exitcode, stdout, stderr = cppcheck(args)
     assert exitcode == 0
@@ -304,9 +321,11 @@ typedef int MISRA_5_6_VIOLATION;
     assert lines == [
         'Checking {} ...'.format(test_file)
     ]
-    assert stderr == ''
+    assert stderr == '{}:2:1: style: Variable Var violates naming convention [naming-varname]\n'.format(test_file)
 
 
+# the namingng addon only works standalone and not in CLI mode - see #12005
+@pytest.mark.skip
 def test_addon_namingng(tmpdir):
     test_file = os.path.join(tmpdir, 'test.cpp')
     # TODO: trigger warning
@@ -315,7 +334,7 @@ def test_addon_namingng(tmpdir):
 typedef int MISRA_5_6_VIOLATION;
         """)
 
-    args = ['--addon=y2038', '--enable=all', test_file]
+    args = ['--addon=namingng', '--enable=all', test_file]
 
     exitcode, stdout, stderr = cppcheck(args)
     assert exitcode == 0
@@ -326,6 +345,49 @@ typedef int MISRA_5_6_VIOLATION;
     assert stderr == ''
 
 
+def test_addon_findcasts(tmpdir):
+    test_file = os.path.join(tmpdir, 'test.cpp')
+    with open(test_file, 'wt') as f:
+        f.write("""
+        extern void f(char c)
+        {
+            int i = (int)c;
+            (void)i;
+        }
+        """)
+
+    args = ['--addon=findcasts', '--enable=all', '--template={file}:{line}:{column}: {severity}:{inconclusive:inconclusive:} {message} [{id}]', test_file]
+
+    exitcode, stdout, stderr = cppcheck(args)
+    assert exitcode == 0
+    lines = stdout.splitlines()
+    assert lines == [
+        'Checking {} ...'.format(test_file)
+    ]
+    assert stderr == '{}:4:21: information: found a cast [findcasts-cast]\n'.format(test_file)
+
+
+def test_addon_misc(tmpdir):
+    test_file = os.path.join(tmpdir, 'test.cpp')
+    with open(test_file, 'wt') as f:
+        f.write("""
+extern void f()
+{
+    char char* [] = {"a" "b"}
+}
+        """)
+
+    args = ['--addon=misc', '--enable=all', '--template={file}:{line}:{column}: {severity}:{inconclusive:inconclusive:} {message} [{id}]', test_file]
+
+    exitcode, stdout, stderr = cppcheck(args)
+    assert exitcode == 0
+    lines = stdout.splitlines()
+    assert lines == [
+        'Checking {} ...'.format(test_file)
+    ]
+    assert stderr == '{}:4:26: style: String concatenation in array initialization, missing comma? [misc-stringConcatInArrayInit]\n'.format(test_file)
+
+
 def test_invalid_addon_json(tmpdir):
     addon_file = os.path.join(tmpdir, 'addon1.json')
     with open(addon_file, 'wt') as f: