fix: StartParameters on Windows (#146)

* change string delimiting char based on os

* test StartParameters in platform_test

* explanatory comment

* use double quotes instead of single quotes for parameter values on all platforms

embedded_postgres.go

@@ -201,8 +201,10 @@ func (ep *EmbeddedPostgres) Stop() error {
 func encodeOptions(port uint32, parameters map[string]string) string {
 	options := []string{fmt.Sprintf("-p %d", port)}
 	for k, v := range parameters {
-		// Single-quote parameter values - they may have spaces.
-		options = append(options, fmt.Sprintf("-c %s='%s'", k, v))
+		// Double-quote parameter values - they may have spaces.
+		// Careful: CMD on Windows uses only double quotes to delimit strings.
+		// It treats single quotes as regular characters.
+		options = append(options, fmt.Sprintf("-c %s=\"%s\"", k, v))
 	}
 	return strings.Join(options, " ")
 }

platform-test/platform_test.go

@@ -42,10 +42,14 @@ func Test_AllMajorVersions(t *testing.T) {
 			port := uint32(5555 + testNumber)
 			runtimePath := filepath.Join(tempExtractLocation, string(version))
 
+			maxConnections := 150
 			database := embeddedpostgres.NewDatabase(embeddedpostgres.DefaultConfig().
 				Version(version).
 				Port(port).
-				RuntimePath(runtimePath))
+				RuntimePath(runtimePath).
+				StartParameters(map[string]string{
+					"max_connections": fmt.Sprintf("%d", maxConnections),
+				}))
 
 			if err := database.Start(); err != nil {
 				shutdownDBAndFail(t, err, database, version)
@@ -64,6 +68,24 @@ func Test_AllMajorVersions(t *testing.T) {
 				shutdownDBAndFail(t, err, database, version)
 			}
 
+			rows, err = db.Query(`SELECT setting::int max_conn FROM pg_settings WHERE name = 'max_connections';`)
+			if err != nil {
+				shutdownDBAndFail(t, err, database, version)
+			}
+			if !rows.Next() {
+				shutdownDBAndFail(t, fmt.Errorf("no rows returned for max_connections"), database, version)
+			}
+			var maxConnReturned int
+			if err := rows.Scan(&maxConnReturned); err != nil {
+				shutdownDBAndFail(t, err, database, version)
+			}
+			if maxConnReturned != maxConnections {
+				shutdownDBAndFail(t, fmt.Errorf("max_connections is %d, not %d as expected", maxConnReturned, maxConnections), database, version)
+			}
+			if err := rows.Close(); err != nil {
+				shutdownDBAndFail(t, err, database, version)
+			}
+
 			if err := db.Close(); err != nil {
 				shutdownDBAndFail(t, err, database, version)
 			}