update to add tests

datastores/sql/postgres/postgres_test.go

@@ -0,0 +1,164 @@
+package postgres
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestDSN(t *testing.T) {
+	c := &Config{
+		Host:     "db.example.com",
+		Port:     "5433",
+		User:     "alice",
+		Password: "s3cret",
+		DBName:   "mydb",
+		SSLMode:  "require",
+	}
+
+	want := "host=db.example.com port=5433 user=alice password=s3cret dbname=mydb sslmode=require"
+	if got := c.DSN(); got != want {
+		t.Errorf("DSN() = %q, want %q", got, want)
+	}
+}
+
+func TestNewConfig_defaults(t *testing.T) {
+	// Clear all env vars that NewConfig reads so we get pure defaults.
+	for _, key := range []string{"DB_HOST", "DB_PORT", "DB_USER", "DB_PASSWORD", "DB_NAME", "DB_SSL_MODE"} {
+		t.Setenv(key, "")
+	}
+
+	c := NewConfig()
+
+	if c.Host != "localhost" {
+		t.Errorf("Host = %q, want %q", c.Host, "localhost")
+	}
+	if c.Port != "5432" {
+		t.Errorf("Port = %q, want %q", c.Port, "5432")
+	}
+	if c.User != "postgres" {
+		t.Errorf("User = %q, want %q", c.User, "postgres")
+	}
+	if c.Password != "postgres" {
+		t.Errorf("Password = %q, want %q", c.Password, "postgres")
+	}
+	if c.DBName != "" {
+		t.Errorf("DBName = %q, want empty", c.DBName)
+	}
+	if c.SSLMode != "disable" {
+		t.Errorf("SSLMode = %q, want %q", c.SSLMode, "disable")
+	}
+}
+
+func TestNewConfig_envOverrides(t *testing.T) {
+	t.Setenv("DB_HOST", "remotehost")
+	t.Setenv("DB_PORT", "9999")
+	t.Setenv("DB_USER", "bob")
+	t.Setenv("DB_PASSWORD", "hunter2")
+	t.Setenv("DB_NAME", "testdb")
+	t.Setenv("DB_SSL_MODE", "verify-full")
+
+	c := NewConfig()
+
+	if c.Host != "remotehost" {
+		t.Errorf("Host = %q, want %q", c.Host, "remotehost")
+	}
+	if c.Port != "9999" {
+		t.Errorf("Port = %q, want %q", c.Port, "9999")
+	}
+	if c.User != "bob" {
+		t.Errorf("User = %q, want %q", c.User, "bob")
+	}
+	if c.Password != "hunter2" {
+		t.Errorf("Password = %q, want %q", c.Password, "hunter2")
+	}
+	if c.DBName != "testdb" {
+		t.Errorf("DBName = %q, want %q", c.DBName, "testdb")
+	}
+	if c.SSLMode != "verify-full" {
+		t.Errorf("SSLMode = %q, want %q", c.SSLMode, "verify-full")
+	}
+}
+
+func TestNewConfig_withContext(t *testing.T) {
+	ctx := context.WithValue(context.Background(), struct{}{}, "test")
+	c := NewConfig(WithContext(ctx))
+
+	if c.Context() != ctx {
+		t.Error("WithContext option did not set the context")
+	}
+}
+
+func TestContext_default(t *testing.T) {
+	c := &Config{}
+	ctx := c.Context()
+	if ctx == nil {
+		t.Fatal("Context() returned nil")
+	}
+	// Should return background context.
+	if ctx != context.Background() {
+		t.Error("Context() should return context.Background() when none set")
+	}
+}
+
+func TestContext_set(t *testing.T) {
+	ctx := t.Context()
+	c := &Config{ctx: ctx}
+	if c.Context() != ctx {
+		t.Error("Context() did not return the set context")
+	}
+}
+
+func TestDialect_Placeholder(t *testing.T) {
+	d := Dialect{}
+	tests := []struct {
+		n    int
+		want string
+	}{
+		{1, "$1"},
+		{2, "$2"},
+		{10, "$10"},
+		{100, "$100"},
+	}
+	for _, tt := range tests {
+		if got := d.Placeholder(tt.n); got != tt.want {
+			t.Errorf("Placeholder(%d) = %q, want %q", tt.n, got, tt.want)
+		}
+	}
+}
+
+func TestDialect_TableExistsQuery(t *testing.T) {
+	q := Dialect{}.TableExistsQuery()
+	if q == "" {
+		t.Fatal("TableExistsQuery() returned empty string")
+	}
+	// Should reference information_schema and use $1 placeholder.
+	if got := q; got != "SELECT EXISTS (SELECT FROM information_schema.tables WHERE table_name = $1)" {
+		t.Errorf("TableExistsQuery() = %q", got)
+	}
+}
+
+func TestDefaultPoolConfig(t *testing.T) {
+	pc := DefaultPoolConfig()
+
+	if pc.MaxConns != 10 {
+		t.Errorf("MaxConns = %d, want 10", pc.MaxConns)
+	}
+	if pc.MinConns != 2 {
+		t.Errorf("MinConns = %d, want 2", pc.MinConns)
+	}
+	if pc.MaxConnLifetime != time.Hour {
+		t.Errorf("MaxConnLifetime = %v, want %v", pc.MaxConnLifetime, time.Hour)
+	}
+	if pc.MaxConnIdleTime != 30*time.Minute {
+		t.Errorf("MaxConnIdleTime = %v, want %v", pc.MaxConnIdleTime, 30*time.Minute)
+	}
+	if pc.HealthCheckPeriod != time.Minute {
+		t.Errorf("HealthCheckPeriod = %v, want %v", pc.HealthCheckPeriod, time.Minute)
+	}
+}
+
+func TestClosePool_nil(t *testing.T) {
+	// Should not panic.
+	ClosePool(nil)
+}