diff --git a/test/cli/qml_test.py b/test/cli/qml_test.py
index 0d1be1ebd59..81c22cf03b0 100644
--- a/test/cli/qml_test.py
+++ b/test/cli/qml_test.py
@@ -2,27 +2,64 @@
 # python3 -m pytest test-qml.py
 
 import os
-import pytest
 from testutils import cppcheck
 
-PROJECT_DIR = 'QML-Samples-TableView'
+__script_dir = os.path.dirname(os.path.abspath(__file__))
+
+# there are unused functions. But fillSampleData is not unused because that is referenced from main.qml
+__project_dir = os.path.join(__script_dir, 'QML-Samples-TableView')
+__project_dir_sep = __project_dir + os.path.sep
 
 
 def test_unused_functions():
-    ret, stdout, stderr = cppcheck(['--library=qt', '--enable=unusedFunction', PROJECT_DIR])
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--library=qt', '--enable=unusedFunction', __project_dir])
     # there are unused functions. But fillSampleData is not unused because that is referenced from main.qml
-    assert '[unusedFunction]' in stderr
-    assert 'fillSampleData' not in stderr
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}samplemodel.cpp:9:0: style: The function 'rowCount' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:15:0: style: The function 'data' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:38:0: style: The function 'roleNames' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
 
+def test_unused_functions_j():
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--library=qt', '--enable=unusedFunction', '-j2', __project_dir])
+    assert stdout.splitlines() == [
+        "cppcheck: unusedFunction check can't be used with '-j' option. Disabling unusedFunction check."
+    ]
+    assert stderr.splitlines() == []
+    assert ret == 0, stdout # TODO: abil out on this
 
-@pytest.mark.xfail
-def test_unused_functions_j(tmpdir):
+
+# TODO: fillSampleData is not unused
+def test_unused_functions_builddir(tmpdir):
     build_dir = os.path.join(tmpdir, 'b1')
     os.mkdir(build_dir)
-    ret, stdout, stderr = cppcheck(['--library=qt', '--enable=unusedFunction', '-j2', '--cppcheck-build-dir={}'.format(build_dir), PROJECT_DIR])
-    # there are unused functions. But fillSampleData is not unused because that is referenced from main.qml
-    assert '[unusedFunction]' in stderr
-    assert 'fillSampleData' not in stderr
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--library=qt', '--enable=unusedFunction', '--cppcheck-build-dir={}'.format(build_dir), __project_dir])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}samplemodel.cpp:15:0: style: The function 'data' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:47:0: style: The function 'fillSampleData' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:38:0: style: The function 'roleNames' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:9:0: style: The function 'rowCount' is never used. [unusedFunction]".format(__project_dir_sep),
+    ]
+    assert ret == 0, stdout
+
+
+# TODO: fillSampleData is not unused
+def test_unused_functions_builddir_j(tmpdir):
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--library=qt', '--enable=unusedFunction', '-j2', '--cppcheck-build-dir={}'.format(build_dir), __project_dir])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}samplemodel.cpp:15:0: style: The function 'data' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:47:0: style: The function 'fillSampleData' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:38:0: style: The function 'roleNames' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}samplemodel.cpp:9:0: style: The function 'rowCount' is never used. [unusedFunction]".format(__project_dir_sep),
+    ]
+    assert ret == 0, stdout
 
 # TODO: test with project file
 # TODO: test with FileSettings
diff --git a/test/cli/unusedFunction/1.c b/test/cli/unusedFunction/1.c
new file mode 100644
index 00000000000..6e725814d2b
--- /dev/null
+++ b/test/cli/unusedFunction/1.c
@@ -0,0 +1,7 @@
+#include "3.h"
+
+// cppcheck-suppress unusedFunction
+void f1()
+{
+    f3_1();
+}
\ No newline at end of file
diff --git a/test/cli/unusedFunction/2.c b/test/cli/unusedFunction/2.c
new file mode 100644
index 00000000000..c6bf77cea8b
--- /dev/null
+++ b/test/cli/unusedFunction/2.c
@@ -0,0 +1,7 @@
+#include "3.h"
+
+// cppcheck-suppress unusedFunction
+void f2()
+{
+    f3_2();
+}
\ No newline at end of file
diff --git a/test/cli/unusedFunction/3.c b/test/cli/unusedFunction/3.c
new file mode 100644
index 00000000000..876803c585b
--- /dev/null
+++ b/test/cli/unusedFunction/3.c
@@ -0,0 +1,3 @@
+void f3_1() {}
+void f3_2() {}
+void f3_3()  {}
\ No newline at end of file
diff --git a/test/cli/unusedFunction/3.h b/test/cli/unusedFunction/3.h
new file mode 100644
index 00000000000..3b643b42c26
--- /dev/null
+++ b/test/cli/unusedFunction/3.h
@@ -0,0 +1,3 @@
+void f3_1();
+void f3_2();
+void f3_3();
\ No newline at end of file
diff --git a/test/cli/unusedFunction/unusedFunction.cppcheck b/test/cli/unusedFunction/unusedFunction.cppcheck
new file mode 100644
index 00000000000..858bee444a6
--- /dev/null
+++ b/test/cli/unusedFunction/unusedFunction.cppcheck
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="1">
+    <paths>
+        <dir name="1.c"/>
+        <dir name="2.c"/>
+        <dir name="3.c"/>
+    </paths>
+</project>
\ No newline at end of file
diff --git a/test/cli/unused_function_test.py b/test/cli/unused_function_test.py
new file mode 100644
index 00000000000..b15b35540b4
--- /dev/null
+++ b/test/cli/unused_function_test.py
@@ -0,0 +1,213 @@
+
+# python3 -m pytest test-unused_function_test.py
+
+import os
+import json
+from testutils import cppcheck
+
+__script_dir = os.path.dirname(os.path.abspath(__file__))
+
+__project_dir = os.path.join(__script_dir, 'unusedFunction')
+__project_dir_sep = __project_dir + os.path.sep
+
+
+# TODO: make this a generic helper function
+def __create_compdb(tmpdir, projpath):
+    compile_commands = os.path.join(tmpdir, 'compile_commands.json')
+    j = [
+        {
+            'directory': projpath,
+            'file': os.path.join(projpath, '1.c'),
+            'command': 'gcc -c 1.c'
+        },
+        {
+            'directory': projpath,
+            'file': os.path.join(projpath, '2.c'),
+            'command': 'gcc -c 2.c'
+        },
+        {
+            'directory': projpath,
+            'file': os.path.join(projpath, '3.c'),
+            'command': 'gcc -c 3.c'
+        }
+        ]
+    with open(compile_commands, 'wt') as f:
+        f.write(json.dumps(j, indent=4))
+    return compile_commands
+
+
+def test_unused_functions():
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--enable=unusedFunction', '--inline-suppr', __project_dir])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+def test_unused_functions_j():
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--enable=unusedFunction', '--inline-suppr', '-j2', __project_dir])
+    assert stdout.splitlines() == [
+        "cppcheck: unusedFunction check can't be used with '-j' option. Disabling unusedFunction check."
+    ]
+    assert stderr.splitlines() == []
+    assert ret == 0, stdout
+
+
+def test_unused_functions_project():
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(os.path.join(__project_dir, 'unusedFunction.cppcheck'))])
+    assert stdout.splitlines() == []
+    assert [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ] == stderr.splitlines()
+    assert ret == 0, stdout
+
+
+def test_unused_functions_project_j():
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(os.path.join(__project_dir, 'unusedFunction.cppcheck')),
+                                    '-j2'])
+    assert stdout.splitlines() == [
+        "cppcheck: unusedFunction check can't be used with '-j' option. Disabling unusedFunction check."
+    ]
+    assert [] == stderr.splitlines()
+    assert ret == 0, stdout
+
+
+def test_unused_functions_compdb(tmpdir):
+    compdb_file = __create_compdb(tmpdir, __project_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(compdb_file)
+                                    ])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+def test_unused_functions_compdb_j(tmpdir):
+    compdb_file = __create_compdb(tmpdir, __project_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(compdb_file),
+                                    '-j2'
+                                    ])
+    assert stdout.splitlines() == [
+        "cppcheck: unusedFunction check can't be used with '-j' option. Disabling unusedFunction check."
+    ]
+    assert stderr.splitlines() == []
+    assert ret == 0, stdout
+
+
+def test_unused_functions_builddir(tmpdir):
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--enable=unusedFunction', '--inline-suppr', '--cppcheck-build-dir={}'.format(build_dir), __project_dir])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+# TODO: only f3_3 is unused
+def test_unused_functions_builddir_j(tmpdir):
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q', '--template=simple', '--enable=unusedFunction', '--inline-suppr', '-j2', '--cppcheck-build-dir={}'.format(build_dir), __project_dir])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}1.c:4:0: style: The function 'f1' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}2.c:4:0: style: The function 'f2' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+def test_unused_functions_builddir_project(tmpdir):
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(os.path.join(__project_dir, 'unusedFunction.cppcheck')),
+                                    '--cppcheck-build-dir={}'.format(build_dir)])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+# TODO: only f3_3 is unused
+def test_unused_functions_builddir_project_j(tmpdir):
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(os.path.join(__project_dir, 'unusedFunction.cppcheck')),
+                                    '--cppcheck-build-dir={}'.format(build_dir),
+                                    '-j2'])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}1.c:4:0: style: The function 'f1' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}2.c:4:0: style: The function 'f2' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+def test_unused_functions_builddir_compdb(tmpdir):
+    compdb_file = __create_compdb(tmpdir, __project_dir)
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(compdb_file),
+                                    '--cppcheck-build-dir={}'.format(build_dir)
+                                    ])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout
+
+
+# TODO: only f3_3 is unused
+def test_unused_functions_builddir_compdb_j(tmpdir):
+    compdb_file = __create_compdb(tmpdir, __project_dir)
+    build_dir = os.path.join(tmpdir, 'b1')
+    os.mkdir(build_dir)
+    ret, stdout, stderr = cppcheck(['-q',
+                                    '--template=simple',
+                                    '--enable=unusedFunction',
+                                    '--inline-suppr',
+                                    '--project={}'.format(compdb_file),
+                                    '--cppcheck-build-dir={}'.format(build_dir),
+                                    '-j2'
+                                    ])
+    assert stdout.splitlines() == []
+    assert stderr.splitlines() == [
+        "{}1.c:4:0: style: The function 'f1' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}2.c:4:0: style: The function 'f2' is never used. [unusedFunction]".format(__project_dir_sep),
+        "{}3.c:3:0: style: The function 'f3_3' is never used. [unusedFunction]".format(__project_dir_sep)
+    ]
+    assert ret == 0, stdout