feat: complete contract-driven business development and MySQL integration

config/projectAdvanced_test.go

@@ -0,0 +1,61 @@
+package config
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestConfigFilePreservesDefaultsWithoutSharingMutableData(t *testing.T) {
+	type cfg struct {
+		Writer io.Writer                `json:"-"`
+		Secret string                   `json:"-"`
+		Values map[string]int64         `json:"values"`
+		Timers map[string]time.Duration `json:"timers"`
+		ID     int64                    `json:"id"`
+	}
+	var writer bytes.Buffer
+	base := cfg{Writer: &writer, Secret: "borrowedSecret", Values: map[string]int64{"old": 7}, ID: 9007199254740993}
+	file := filepath.Join(t.TempDir(), "config.json")
+	if err := os.WriteFile(file, []byte(`{"values":{"new":2},"timers":{"retry":"2s"}}`), 0600); err != nil {
+		t.Fatal(err)
+	}
+	next, err := DecodeFile(file, base)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if next.Writer != &writer || next.Secret != base.Secret || next.ID != base.ID || next.Timers["retry"] != 2*time.Second || len(base.Values) != 1 {
+		t.Fatal("defaults lost or mutated")
+	}
+	next.Values["old"] = 9
+	if base.Values["old"] != 7 {
+		t.Fatal("defaults shared map")
+	}
+	if err = os.WriteFile(file, []byte(`{"values":{"secretValue":"credential-super-secret"}}`), 0600); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = DecodeFile(file, base); err == nil || strings.Contains(err.Error(), "credential-super-secret") {
+		t.Fatal("decode error leaked contents", err)
+	}
+}
+func TestEnvCollectionPrecisionAndDurationMaps(t *testing.T) {
+	type cfg struct {
+		IDs    []int64                  `json:"ids"`
+		Timers map[string]time.Duration `json:"timers"`
+	}
+	lookup := func(key string) (string, bool) {
+		v, ok := map[string]string{"IDS": "[9007199254740993]", "TIMERS": `{"backoff":"250ms"}`}[key]
+		return v, ok
+	}
+	c, err := OverlayEnv(cfg{}, EnvOptions{Lookup: lookup})
+	if err != nil || c.IDs[0] != 9007199254740993 || c.Timers["backoff"] != 250*time.Millisecond {
+		t.Fatal(c, err)
+	}
+	if _, err = OverlayEnv(cfg{}, EnvOptions{Lookup: func(key string) (string, bool) { return `{"x":"1s","x":"2s"}`, key == "TIMERS" }}); err == nil {
+		t.Fatal("duplicate map key accepted")
+	}
+}