initial commits

temporal_marshaljson.go

@@ -0,0 +1,30 @@
+package tmp
+
+import (
+	"encoding/json"
+
+	"sourcecode.social/reiver/go-erorr"
+)
+
+var _ json.Marshaler = Nothing[bool]()
+var _ json.Marshaler = Nothing[string]()
+
+// MarshalJSON makes it so json.Marshaler is implemented.
+func (receiver Temporal[T]) MarshalJSON() ([]byte, error) {
+	switch interface{}(receiver.value).(type) {
+	case bool, string,json.Marshaler:
+		// these are OK.
+	default:
+		return nil, erorr.Errorf("tmp: cannot marshal something of type %T into JSON because parameterized type is ‘%T’ rather than ‘bool’, ‘string’, or ‘json.Marshaler’", receiver, receiver.value)
+	}
+
+	if receiver.isnothing() {
+		return nil, erorr.Errorf("tmp: cannot marshal opt.Nothing[%T]() into JSON", receiver.value)
+	}
+
+	if receiver.IsDefunct() {
+		return nil, erorr.Errorf("tmp: cannot marshal defunct %#v into JSON", receiver.value)
+	}
+
+	return json.Marshal(receiver.value)
+}

temporal_marshaljson_bool_test.go

@@ -0,0 +1,96 @@
+package tmp_test
+
+import (
+	"testing"
+
+	"sourcecode.social/reiver/go-tmp"
+)
+
+func TestTemporal_MarshalJSON_bool(t *testing.T) {
+
+	tests := []struct{
+		Value tmp.Temporal[bool]
+		Expected string
+	}{
+		{
+			Value: tmp.Permanent(false),
+			Expected: "false",
+		},
+		{
+			Value: tmp.Permanent(true),
+			Expected: "true",
+		},
+
+
+
+		{
+			Value: tmp.Temporary(false, 9_223_372_036_854_775_807), // supposed to be a time far in the future
+			Expected: "false",
+		},
+		{
+			Value: tmp.Temporary(true, 9_223_372_036_854_775_806), // supposed to be a time far in the future
+			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 TestTemporal_MarshalJSON_bool_fail(t *testing.T) {
+
+	tests := []struct{
+		Value tmp.Temporal[bool]
+	}{
+		{
+			Value: tmp.Nothing[bool](),
+		},
+
+
+
+		{
+			Value: tmp.Temporary(false, 1234), // supposed to be a time that is already expired
+		},
+		{
+			Value: tmp.Temporary(true, 5678), // supposed to be a time that is already expired
+		},
+	}
+
+
+	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
+		}
+	}
+}
+