diff --git a/nullable_marshaljson_string_test.go b/nullable_marshaljson_string_test.go
new file mode 100644
index 0000000..05647d5
--- /dev/null
+++ b/nullable_marshaljson_string_test.go
@@ -0,0 +1,131 @@
+package nul_test
+
+import (
+	"testing"
+
+	"sourcecode.social/reiver/go-nul"
+)
+
+func TestNullable_MarshalJSON_string(t *testing.T) {
+
+	tests := []struct{
+		Value nul.Nullable[string]
+		Expected string
+	}{
+		{
+			Value: nul.Null[string](),
+			Expected: `null`,
+		},
+
+
+
+		{
+			Value: nul.Something(""),
+			Expected: `""`,
+		},
+
+
+
+		{
+			Value: nul.Something("apple"),
+			Expected: `"apple"`,
+		},
+		{
+			Value: nul.Something("banana"),
+			Expected: `"banana"`,
+		},
+		{
+			Value: nul.Something("cherry"),
+			Expected: `"cherry"`,
+		},
+
+
+
+		{
+			Value: nul.Something("ONCE"),
+			Expected: `"ONCE"`,
+		},
+		{
+			Value: nul.Something("TWICE"),
+			Expected: `"TWICE"`,
+		},
+		{
+			Value: nul.Something("THRICE"),
+			Expected: `"THRICE"`,
+		},
+		{
+			Value: nul.Something("FOURCE"),
+			Expected: `"FOURCE"`,
+		},
+
+
+
+		{
+			Value: nul.Something("🙂"),
+			Expected: `"🙂"`,
+		},
+		{
+			Value: nul.Something("😈"),
+			Expected: `"😈"`,
+		},
+		{
+			Value: nul.Something("❤️"),
+			Expected: `"❤️"`,
+		},
+
+
+
+		{
+			Value: nul.Something("٠١٢٣۴۵۶٧٨٩"),
+			Expected: `"٠١٢٣۴۵۶٧٨٩"`,
+		},
+
+
+
+		{
+			Value: nul.Something("𐏑𐏓𐏕"),
+			Expected: `"𐏑𐏓𐏕"`,
+		},
+	}
+
+	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_string_fail(t *testing.T) {
+
+	var nothing nul.Nullable[string]
+
+	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
+	}
+}