diff --git a/src/jsonyx/_encoder.py b/src/jsonyx/_encoder.py
index bea7bb4..3c6ac94 100644
--- a/src/jsonyx/_encoder.py
+++ b/src/jsonyx/_encoder.py
@@ -187,12 +187,13 @@ def write_value(
                 write(encode_string(obj))
             elif obj is None:
                 write("null")
-            elif obj is True:
-                write("true")
-            elif obj is False:
-                write("false")
             elif isinstance(obj, int):
-                write(int_repr(obj))
+                if obj is True:
+                    write("true")
+                elif obj is False:
+                    write("false")
+                else:
+                    write(int_repr(obj))
             elif isinstance(obj, float):
                 write(floatstr(obj))
             elif isinstance(obj, list):
diff --git a/src/jsonyx/test/__init__.py b/src/jsonyx/test/__init__.py
index 0176e38..63857f9 100644
--- a/src/jsonyx/test/__init__.py
+++ b/src/jsonyx/test/__init__.py
@@ -1,5 +1,4 @@
 # Copyright (C) 2024 Nice Zombies
-# TODO(Nice Zombies): test jsonyx.dumps
 """Get JSON module."""
 from __future__ import annotations
 
diff --git a/src/jsonyx/test/test_dumps.py b/src/jsonyx/test/test_dumps.py
new file mode 100644
index 0000000..12b55a1
--- /dev/null
+++ b/src/jsonyx/test/test_dumps.py
@@ -0,0 +1,27 @@
+# Copyright (C) 2024 Nice Zombies
+# TODO(Nice Zombies): add more tests
+"""JSON dumps tests."""
+from __future__ import annotations
+
+__all__: list[str] = []
+
+from typing import TYPE_CHECKING
+
+import pytest
+# pylint: disable-next=W0611
+from jsonyx.test import get_json  # type: ignore # noqa: F401
+
+if TYPE_CHECKING:
+    from types import ModuleType
+
+
+@pytest.mark.parametrize(("obj", "expected"), [
+    (True, "true"),
+    (False, "false"),
+    (None, "null"),
+])
+def test_singletons(
+    json: ModuleType, obj: bool | None, expected: str,  # noqa: FBT001
+) -> None:
+    """Test Python singletons."""
+    assert json.dumps(obj, end="") == expected
diff --git a/src/jsonyx/test/test_jsonyx.py b/src/jsonyx/test/test_jsonyx.py
index 1c3273d..9047ea9 100644
--- a/src/jsonyx/test/test_jsonyx.py
+++ b/src/jsonyx/test/test_jsonyx.py
@@ -98,8 +98,8 @@ def test_format_syntax_error(
 def test_dump(json: ModuleType) -> None:
     """Test JSON dump."""
     fp: StringIO = StringIO()
-    json.dump(0, fp)
-    assert fp.getvalue() == "0\n"
+    json.dump(0, fp, end="")
+    assert fp.getvalue() == "0"
 
 
 def test_load(json: ModuleType) -> None:
diff --git a/src/jsonyx/test/test_loads.py b/src/jsonyx/test/test_loads.py
index 889c753..c0771f2 100644
--- a/src/jsonyx/test/test_loads.py
+++ b/src/jsonyx/test/test_loads.py
@@ -69,15 +69,17 @@ def test_utf8_bom(json: ModuleType) -> None:
     ("false", False),
     ("null", None),
 ])
-def test_keywords(json: ModuleType, s: str, *, expected: bool | None) -> None:
-    """Test JSON keywords."""
+def test_literal_names(
+    json: ModuleType, s: str, expected: bool | None,  # noqa: FBT001
+) -> None:
+    """Test literal names."""
     assert json.loads(s) is expected
 
 
 @pytest.mark.parametrize("s", ["NaN", "Infinity", "-Infinity"])
 @pytest.mark.parametrize("use_decimal", [True, False])
 def test_nan_and_infinity(
-    json: ModuleType, s: str, *, use_decimal: bool,
+    json: ModuleType, s: str, use_decimal: bool,  # noqa: FBT001
 ) -> None:
     """Test NaN and infinity with decimal and float."""
     obj: object = json.loads(
@@ -95,7 +97,7 @@ def test_nan_and_infinity(
 @pytest.mark.parametrize("s", ["NaN", "Infinity", "-Infinity"])
 @pytest.mark.parametrize("use_decimal", [True, False])
 def test_nan_and_infinity_not_allowed(
-    json: ModuleType, s: str, *, use_decimal: bool,
+    json: ModuleType, s: str, use_decimal: bool,  # noqa: FBT001
 ) -> None:
     """Test NaN and infinity with decimal and float if not allowed."""
     with pytest.raises(json.JSONSyntaxError) as exc_info:
@@ -141,7 +143,7 @@ def test_int(json: ModuleType, s: str) -> None:
 ])
 @pytest.mark.parametrize("use_decimal", [True, False])
 def test_decimal_and_float(
-    json: ModuleType, s: str, *, use_decimal: bool,
+    json: ModuleType, s: str, use_decimal: bool,  # noqa: FBT001
 ) -> None:
     """Test decimal and float."""
     obj: object = json.loads(s, use_decimal=use_decimal)
diff --git a/src/jsonyx/test/test_write.py b/src/jsonyx/test/test_write.py
index ca037be..2c4732a 100644
--- a/src/jsonyx/test/test_write.py
+++ b/src/jsonyx/test/test_write.py
@@ -21,20 +21,20 @@ def test_value(json: ModuleType) -> None:
     """Test JSON value."""
     with TemporaryDirectory() as tmpdir:
         filename: Path = Path(tmpdir) / "file.json"
-        json.write(0, filename)
-        assert filename.read_text("utf_8") == "0\n"
+        json.write(0, filename, end="")
+        assert filename.read_text("utf_8") == "0"
 
 
 @pytest.mark.parametrize(("s", "expected"), [
-    ("\ud800", '"\ud800"\n'),
-    ("\ud800$", '"\ud800$"\n'),
-    ("\udf48", '"\udf48"\n'),  # noqa: PT014
+    ("\ud800", '"\ud800"'),
+    ("\ud800$", '"\ud800$"'),
+    ("\udf48", '"\udf48"'),  # noqa: PT014
 ])
 def test_surrogates(json: ModuleType, s: str, expected: str) -> None:
     """Test surrogates."""
     with TemporaryDirectory() as tmpdir:
         filename: Path = Path(tmpdir) / "file.json"
-        json.write(s, filename, allow=SURROGATES)
+        json.write(s, filename, allow=SURROGATES, end="")
         assert filename.read_text("utf_8", "surrogatepass") == expected