diff --git a/temporal_marshaljson_string_test.go b/temporal_marshaljson_string_test.go
new file mode 100644
index 0000000..c8fff12
--- /dev/null
+++ b/temporal_marshaljson_string_test.go
@@ -0,0 +1,208 @@
+package tmp_test
+
+import (
+	"testing"
+
+	"time"
+
+	"sourcecode.social/reiver/go-tmp"
+)
+
+func TestNullable_MarshalJSON_string(t *testing.T) {
+
+	tests := []struct{
+		Value tmp.Temporal[string]
+		Expected string
+	}{
+		{
+			Value: tmp.Permanent(""),
+			Expected: `""`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("", time.Unix(9_223_372_036_854_775_807,0)), // this is supposed to be some time far in the future
+			Expected: `""`,
+		},
+
+
+
+		{
+			Value: tmp.Permanent("apple"),
+			Expected: `"apple"`,
+		},
+		{
+			Value: tmp.Permanent("banana"),
+			Expected: `"banana"`,
+		},
+		{
+			Value: tmp.Permanent("cherry"),
+			Expected: `"cherry"`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("apple", time.Unix(9_223_372_036_854_775_806,0)), // this is supposed to be some time far in the future
+			Expected: `"apple"`,
+		},
+		{
+			Value: tmp.Temporary("banana", time.Unix(9_223_372_036_854_775_805,0)), // this is supposed to be some time far in the future
+			Expected: `"banana"`,
+		},
+		{
+			Value: tmp.Temporary("cherry", time.Unix(9_223_372_036_854_775_804,0)), // this is supposed to be some time far in the future
+			Expected: `"cherry"`,
+		},
+
+
+
+		{
+			Value: tmp.Permanent("ONCE"),
+			Expected: `"ONCE"`,
+		},
+		{
+			Value: tmp.Permanent("TWICE"),
+			Expected: `"TWICE"`,
+		},
+		{
+			Value: tmp.Permanent("THRICE"),
+			Expected: `"THRICE"`,
+		},
+		{
+			Value: tmp.Permanent("FOURCE"),
+			Expected: `"FOURCE"`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("ONCE", time.Unix(9_223_372_036_854_775_803,0)), // this is supposed to be some time far in the future
+			Expected: `"ONCE"`,
+		},
+		{
+			Value: tmp.Temporary("TWICE", time.Unix(9_223_372_036_854_775_802,0)), // this is supposed to be some time far in the future
+			Expected: `"TWICE"`,
+		},
+		{
+			Value: tmp.Temporary("THRICE", time.Unix(9_223_372_036_854_775_801,0)), // this is supposed to be some time far in the future
+			Expected: `"THRICE"`,
+		},
+		{
+			Value: tmp.Temporary("FOURCE", time.Unix(9_223_372_036_854_775_800,0)), // this is supposed to be some time far in the future
+			Expected: `"FOURCE"`,
+		},
+
+
+
+		{
+			Value: tmp.Permanent("🙂"),
+			Expected: `"🙂"`,
+		},
+		{
+			Value: tmp.Permanent("😈"),
+			Expected: `"😈"`,
+		},
+		{
+			Value: tmp.Permanent("❤️"),
+			Expected: `"❤️"`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("🙂", time.Unix(9_223_372_036_854_775_799,0)), // this is supposed to be some time far in the future
+			Expected: `"🙂"`,
+		},
+		{
+			Value: tmp.Temporary("😈", time.Unix(9_223_372_036_854_775_798,0)), // this is supposed to be some time far in the future
+			Expected: `"😈"`,
+		},
+		{
+			Value: tmp.Temporary("❤️", time.Unix(9_223_372_036_854_775_797,0)), // this is supposed to be some time far in the future
+			Expected: `"❤️"`,
+		},
+
+
+
+		{
+			Value: tmp.Permanent("٠١٢٣۴۵۶٧٨٩"),
+			Expected: `"٠١٢٣۴۵۶٧٨٩"`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("٠١٢٣۴۵۶٧٨٩", time.Unix(9_223_372_036_854_775_796,0)), // this is supposed to be some time far in the future
+			Expected: `"٠١٢٣۴۵۶٧٨٩"`,
+		},
+
+
+
+		{
+			Value: tmp.Permanent("𐏑𐏓𐏕"),
+			Expected: `"𐏑𐏓𐏕"`,
+		},
+
+
+
+		{
+			Value: tmp.Temporary("𐏑𐏓𐏕", time.Unix(9_223_372_036_854_775_795,0)), // this is supposed to be some time far in the future
+			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) {
+
+	tests := []struct{
+		Value tmp.Temporal[string]
+	}{
+		{
+			Value: tmp.Nothing[string](),
+		},
+		{
+			Value: tmp.Temporary("expired", time.Unix(11,0)),
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		actualBytes, err := test.Value.MarshalJSON()
+		if nil == err {
+			t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
+			t.Logf("ACTUAL: %q", actualBytes)
+			t.Logf("ERROR: (%T) %s", err, err)
+			continue
+		}
+		if nil != actualBytes {
+			t.Errorf("For test #%d, expected not bytes but actually get some.", testNumber)
+			t.Logf("ACTUAL: %q", actualBytes)
+			t.Logf("ERROR: (%T) %s", err, err)
+			continue
+		}
+	}
+}