diff --git a/nullable_marshaljson_bool_test.go b/nullable_marshaljson_bool_test.go
new file mode 100644
index 0000000..45c02ad
--- /dev/null
+++ b/nullable_marshaljson_bool_test.go
@@ -0,0 +1,69 @@
+package nul_test
+
+import (
+	"testing"
+
+	"sourcecode.social/reiver/go-nul"
+)
+
+func TestNullable_MarshalJSON_bool(t *testing.T) {
+
+	tests := []struct{
+		Value nul.Nullable[bool]
+		Expected string
+	}{
+		{
+			Value: nul.Null[bool](),
+			Expected: "null",
+		},
+		{
+			Value: nul.Something(false),
+			Expected: "false",
+		},
+		{
+			Value: nul.Something(true),
+			Expected: "true",
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		actualBytes, err := test.Value.MarshalJSON()
+		if nil != err {
+			t.Errorf("For test #%d, did not expect an error but actually got one." , testNumber)
+			t.Logf("ERROR: (%T) %s", err, err)
+			t.Logf("VALUE: %#v", test.Value)
+			continue
+		}
+
+		actual := string(actualBytes)
+		expected := test.Expected
+
+		if expected != actual {
+			t.Errorf("For test #%d, the actual value for the JSON marshaling is not what was expected.", testNumber)
+			t.Logf("EXPECTED: %q", expected)
+			t.Logf("ACTUAL:   %q", actual)
+			t.Logf("VALUE: %#v", test.Value)
+			continue
+		}
+	}
+}
+
+func TestNullable_MarshalJSON_bool_fail(t *testing.T) {
+
+	var nothing nul.Nullable[bool]
+
+	actualBytes, err := nothing.MarshalJSON()
+	if nil == err {
+		t.Error("Expected an error but did not actually get one.")
+		t.Logf("ACTUAL: %q", actualBytes)
+		t.Logf("ERROR: (%T) %s", err, err)
+		return
+	}
+	if nil != actualBytes {
+		t.Error("Expected not bytes but actually get some.")
+		t.Logf("ACTUAL: %q", actualBytes)
+		t.Logf("ERROR: (%T) %s", err, err)
+		return
+	}
+}