init

config/config_test.go

@@ -0,0 +1,73 @@
+package config
+
+import (
+	"flag"
+	"testing"
+)
+
+func bind(t *testing.T, args ...string) (*Config, error) {
+	t.Helper()
+	fs := flag.NewFlagSet("t", flag.ContinueOnError)
+	c, err := Bind(fs)
+	if err != nil {
+		return nil, err
+	}
+	if err := fs.Parse(args); err != nil {
+		t.Fatal(err)
+	}
+	return c, nil
+}
+
+func TestBindDefaults(t *testing.T) {
+	c, err := bind(t)
+	if err != nil || *c != Default() {
+		t.Fatalf("got %+v, %v", c, err)
+	}
+}
+
+func TestBindEnvAndFlagPrecedence(t *testing.T) {
+	t.Setenv("WH_SEED", "42")
+	t.Setenv("WH_TICKS_PER_DAY", "720")
+	t.Setenv("WH_ASTEROIDS", "60")
+
+	c, err := bind(t)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c.Seed != 42 || c.TicksPerDay != 720 || c.AsteroidCount != 60 || c.CyclesPerTick != Default().CyclesPerTick {
+		t.Fatalf("env not applied: %+v", c)
+	}
+	if err := c.Validate(); err != nil {
+		t.Fatal(err)
+	}
+
+	c, err = bind(t, "-seed", "7")
+	if err != nil || c.Seed != 7 || c.TicksPerDay != 720 {
+		t.Fatalf("flag should override env only for itself: %+v, %v", c, err)
+	}
+}
+
+func TestBindRejectsBadEnv(t *testing.T) {
+	for _, v := range []string{"lots", "-3", "1.5"} {
+		t.Setenv("WH_SEED", v)
+		if _, err := bind(t); err == nil {
+			t.Errorf("WH_SEED=%q should be rejected", v)
+		}
+	}
+	t.Setenv("WH_SEED", "")
+	t.Setenv("WH_COMM_BYTES", "big")
+	if _, err := bind(t); err == nil {
+		t.Error("WH_COMM_BYTES=big should be rejected")
+	}
+}
+
+func TestDatabaseURL(t *testing.T) {
+	t.Setenv("DATABASE_URL", "")
+	if DatabaseURL() != "sqlite:wh.db" {
+		t.Fatal("default")
+	}
+	t.Setenv("DATABASE_URL", "postgres://x")
+	if DatabaseURL() != "postgres://x" {
+		t.Fatal("env")
+	}
+}