feat(mocktesting): initial implementation

t_go116.go

@@ -0,0 +1,31 @@
+//go:build go1.16
+// +build go1.16
+
+package mocktesting
+
+func (t *T) Setenv(key string, value string) {
+	t.mux.Lock()
+	defer t.mux.Unlock()
+
+	if t.env == nil {
+		t.env = map[string]string{}
+	}
+
+	if key != "" {
+		t.env[key] = value
+	}
+}
+
+// Getenv returns a map[string]string of keys/values given to Setenv().
+func (t *T) Getenv() map[string]string {
+	if t.env == nil {
+		t.mux.Lock()
+		t.env = map[string]string{}
+		t.mux.Unlock()
+	}
+
+	t.mux.RLock()
+	defer t.mux.RUnlock()
+
+	return t.env
+}