How to use the pluggy._TagTracer function in pluggy

def test_simple(self):
        rootlogger = _TagTracer()
        log = rootlogger.get("pytest")
        log("hello")
        l = []
        rootlogger.setwriter(l.append)
        log("world")
        assert len(l) == 1
        assert l[0] == "world [pytest]\n"
        sublog = log.get("collection")
        sublog("hello")
        assert l[1] == "hello [pytest:collection]\n"

def test_setprocessor():
    rootlogger = _TagTracer()
    log = rootlogger.get("1")
    log2 = log.get("2")
    assert log2.tags == tuple("12")
    out = []
    rootlogger.setprocessor(tuple("12"), lambda *args: out.append(args))
    log("not seen")
    log2("seen")
    assert len(out) == 1
    tags, args = out[0]
    assert "1" in tags
    assert "2" in tags
    assert args == ("seen",)
    l2 = []
    rootlogger.setprocessor("1:2", lambda *args: l2.append(args))
    log2("seen")
    tags, args = l2[0]

def test_readable_output_dictargs():
    rootlogger = _TagTracer()

    out = rootlogger.format_message(['test'], [1])
    assert out == ['1 [test]\n']

    out2 = rootlogger.format_message(['test'], ['test', {'a': 1}])
    assert out2 == [
        'test [test]\n',
        '    a: 1\n'
    ]

def test_simple():
    rootlogger = _TagTracer()
    log = rootlogger.get("pytest")
    log("hello")
    out = []
    rootlogger.setwriter(out.append)
    log("world")
    assert len(out) == 1
    assert out[0] == "world [pytest]\n"
    sublog = log.get("collection")
    sublog("hello")
    assert out[1] == "hello [pytest:collection]\n"

def test_setmyprocessor(self):
        rootlogger = _TagTracer()
        log = rootlogger.get("1")
        log2 = log.get("2")
        l = []
        log2.setmyprocessor(lambda *args: l.append(args))
        log("not seen")
        assert not l
        log2(42)
        assert len(l) == 1
        tags, args = l[0]
        assert "1" in tags
        assert "2" in tags
        assert args == (42,)

def test_indent(self):
        rootlogger = _TagTracer()
        log = rootlogger.get("1")
        l = []
        log.root.setwriter(lambda arg: l.append(arg))
        log("hello")
        log.root.indent += 1
        log("line1")
        log("line2")
        log.root.indent += 1
        log("line3")
        log("line4")
        log.root.indent -= 1
        log("line5")
        log.root.indent -= 1
        log("last")
        assert len(l) == 7
        names = [x[:x.rfind(' [')] for x in l]

def test_setmyprocessor():
    rootlogger = _TagTracer()
    log = rootlogger.get("1")
    log2 = log.get("2")
    out = []
    log2.setmyprocessor(lambda *args: out.append(args))
    log("not seen")
    assert not out
    log2(42)
    assert len(out) == 1
    tags, args = out[0]
    assert "1" in tags
    assert "2" in tags
    assert args == (42,)

def test_readable_output_dictargs(self):
        rootlogger = _TagTracer()

        out = rootlogger.format_message(['test'], [1])
        assert out == ['1 [test]\n']

        out2 = rootlogger.format_message(['test'], ['test', {'a': 1}])
        assert out2 == [
            'test [test]\n',
            '    a: 1\n'
        ]

def test_setprocessor(self):
        rootlogger = _TagTracer()
        log = rootlogger.get("1")
        log2 = log.get("2")
        assert log2.tags == tuple("12")
        l = []
        rootlogger.setprocessor(tuple("12"), lambda *args: l.append(args))
        log("not seen")
        log2("seen")
        assert len(l) == 1
        tags, args = l[0]
        assert "1" in tags
        assert "2" in tags
        assert args == ("seen",)
        l2 = []
        rootlogger.setprocessor("1:2", lambda *args: l2.append(args))
        log2("seen")
        tags, args = l2[0]

def test_indent():
    rootlogger = _TagTracer()
    log = rootlogger.get("1")
    out = []
    log.root.setwriter(lambda arg: out.append(arg))
    log("hello")
    log.root.indent += 1
    log("line1")
    log("line2")
    log.root.indent += 1
    log("line3")
    log("line4")
    log.root.indent -= 1
    log("line5")
    log.root.indent -= 1
    log("last")
    assert len(out) == 7
    names = [x[:x.rfind(' [')] for x in out]