diff --git a/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootContextLoader.java b/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootContextLoader.java
index e90d067a5f..91630ea97b 100644
--- a/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootContextLoader.java
+++ b/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootContextLoader.java
@@ -153,8 +153,11 @@ public class SpringBootContextLoader extends AbstractContextLoader {
 	}
 
 	private void setActiveProfiles(ConfigurableEnvironment environment, String[] profiles) {
-		TestPropertyValues.of("spring.profiles.active=" + StringUtils.arrayToCommaDelimitedString(profiles))
-				.applyTo(environment);
+		String[] pairs = new String[profiles.length];
+		for (int i = 0; i < profiles.length; i++) {
+			pairs[i] = "spring.profiles.active[" + i + "]=" + profiles[i];
+		}
+		TestPropertyValues.of(pairs).applyTo(environment);
 	}
 
 	protected String[] getInlinedProperties(MergedContextConfiguration config) {
diff --git a/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootContextLoaderTests.java b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootContextLoaderTests.java
index 0ca15147de..e34568306f 100644
--- a/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootContextLoaderTests.java
+++ b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootContextLoaderTests.java
@@ -21,7 +21,9 @@ import java.util.Map;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.TestContext;
@@ -41,41 +43,41 @@ class SpringBootContextLoaderTests {
 
 	@Test
 	void environmentPropertiesSimple() {
-		Map<String, Object> config = getEnvironmentProperties(SimpleConfig.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(SimpleConfig.class);
 		assertKey(config, "key", "myValue");
 		assertKey(config, "anotherKey", "anotherValue");
 	}
 
 	@Test
 	void environmentPropertiesSimpleNonAlias() {
-		Map<String, Object> config = getEnvironmentProperties(SimpleConfigNonAlias.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(SimpleConfigNonAlias.class);
 		assertKey(config, "key", "myValue");
 		assertKey(config, "anotherKey", "anotherValue");
 	}
 
 	@Test
 	void environmentPropertiesOverrideDefaults() {
-		Map<String, Object> config = getEnvironmentProperties(OverrideConfig.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(OverrideConfig.class);
 		assertKey(config, "server.port", "2345");
 	}
 
 	@Test
 	void environmentPropertiesAppend() {
-		Map<String, Object> config = getEnvironmentProperties(AppendConfig.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(AppendConfig.class);
 		assertKey(config, "key", "myValue");
 		assertKey(config, "otherKey", "otherValue");
 	}
 
 	@Test
 	void environmentPropertiesSeparatorInValue() {
-		Map<String, Object> config = getEnvironmentProperties(SameSeparatorInValue.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(SameSeparatorInValue.class);
 		assertKey(config, "key", "my=Value");
 		assertKey(config, "anotherKey", "another:Value");
 	}
 
 	@Test
 	void environmentPropertiesAnotherSeparatorInValue() {
-		Map<String, Object> config = getEnvironmentProperties(AnotherSeparatorInValue.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(AnotherSeparatorInValue.class);
 		assertKey(config, "key", "my:Value");
 		assertKey(config, "anotherKey", "another=Value");
 	}
@@ -84,12 +86,33 @@ class SpringBootContextLoaderTests {
 	@Disabled
 	void environmentPropertiesNewLineInValue() {
 		// gh-4384
-		Map<String, Object> config = getEnvironmentProperties(NewLineInValue.class);
+		Map<String, Object> config = getMergedContextConfigurationProperties(NewLineInValue.class);
 		assertKey(config, "key", "myValue");
 		assertKey(config, "variables", "foo=FOO\n bar=BAR");
 	}
 
-	private Map<String, Object> getEnvironmentProperties(Class<?> testClass) {
+	@Test
+	void noActiveProfiles() {
+		assertThat(getActiveProfiles(SimpleConfig.class)).isEmpty();
+	}
+
+	@Test
+	void multipleActiveProfiles() {
+		assertThat(getActiveProfiles(MultipleActiveProfiles.class)).containsExactly("profile1", "profile2");
+	}
+
+	@Test
+	void activeProfileWithComma() {
+		assertThat(getActiveProfiles(ActiveProfileWithComma.class)).containsExactly("profile1,2");
+	}
+
+	private String[] getActiveProfiles(Class<?> testClass) {
+		TestContext testContext = new ExposedTestContextManager(testClass).getExposedTestContext();
+		ApplicationContext applicationContext = testContext.getApplicationContext();
+		return applicationContext.getEnvironment().getActiveProfiles();
+	}
+
+	private Map<String, Object> getMergedContextConfigurationProperties(Class<?> testClass) {
 		TestContext context = new ExposedTestContextManager(testClass).getExposedTestContext();
 		MergedContextConfiguration config = (MergedContextConfiguration) ReflectionTestUtils.getField(context,
 				"mergedContextConfiguration");
@@ -143,6 +166,20 @@ class SpringBootContextLoaderTests {
 
 	}
 
+	@SpringBootTest
+	@ActiveProfiles({ "profile1", "profile2" })
+	@ContextConfiguration(classes = Config.class)
+	static class MultipleActiveProfiles {
+
+	}
+
+	@SpringBootTest
+	@ActiveProfiles({ "profile1,2" })
+	@ContextConfiguration(classes = Config.class)
+	static class ActiveProfileWithComma {
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class Config {