Polish "Use milliseconds when configuring awaitTerminationPeriod"

See gh-22604

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/task/TaskExecutorBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/task/TaskExecutorBuilderTests.java

@@ -61,14 +61,10 @@ class TaskExecutorBuilderTests {
 	}
 
 	@Test
-	void awaitTerminationPeriodShouldApply() {
+	void awaitTerminationPeriodShouldApplyWithMillisecondPrecision() {
-		Duration period = Duration.ofMinutes(1);
+		Duration period = Duration.ofMillis(50);
 		ThreadPoolTaskExecutor executor = this.builder.awaitTerminationPeriod(period).build();
 		assertThat(executor).hasFieldOrPropertyWithValue("awaitTerminationMillis", period.toMillis());
-
-		period = Duration.ofMillis(50);
-		executor = this.builder.awaitTerminationPeriod(period).build();
-		assertThat(executor).hasFieldOrPropertyWithValue("awaitTerminationMillis", period.toMillis());
 	}
 
 	@Test