diff --git a/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborDecoderTests.kt b/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborDecoderTests.kt
index 88933457bc5..bfba56dd4b3 100644
--- a/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborDecoderTests.kt
+++ b/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborDecoderTests.kt
@@ -20,7 +20,7 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.cbor.Cbor
 import kotlinx.serialization.serializer
-import org.assertj.core.api.Assertions
+import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
@@ -45,17 +45,17 @@ class KotlinSerializationCborDecoderTests : AbstractDecoderTests<KotlinSerializa
 	@Suppress("UsePropertyAccessSyntax", "DEPRECATION")
 	@Test
 	override fun canDecode() {
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), null)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(String::class.java), null)).isFalse()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), null)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClass(String::class.java), null)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
 
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
 	}
 
 	@Test
diff --git a/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborEncoderTests.kt b/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborEncoderTests.kt
index 0695e002477..e5e27ce1ad5 100644
--- a/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborEncoderTests.kt
+++ b/spring-web/src/test/kotlin/org/springframework/http/codec/cbor/KotlinSerializationCborEncoderTests.kt
@@ -20,7 +20,7 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.cbor.Cbor
 import kotlinx.serialization.encodeToByteArray
-import org.assertj.core.api.Assertions
+import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
@@ -47,14 +47,14 @@ class KotlinSerializationCborEncoderTests : AbstractEncoderTests<KotlinSerializa
 	@Test
 	override fun canEncode() {
 		val pojoType = ResolvableType.forClass(Pojo::class.java)
-		Assertions.assertThat(encoder.canEncode(pojoType, MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(encoder.canEncode(pojoType, null)).isTrue()
+		assertThat(encoder.canEncode(pojoType, MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(encoder.canEncode(pojoType, null)).isTrue()
 
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_CBOR)).isTrue()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
 	}
 
 	@Test
@@ -90,11 +90,11 @@ class KotlinSerializationCborEncoderTests : AbstractEncoderTests<KotlinSerializa
 
 	@Test
 	fun canNotEncode() {
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(String::class.java), null)).isFalse()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClass(String::class.java), null)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
 		val sseType = ResolvableType.forClass(ServerSentEvent::class.java)
-		Assertions.assertThat(encoder.canEncode(sseType, MediaType.APPLICATION_CBOR)).isFalse()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
+		assertThat(encoder.canEncode(sseType, MediaType.APPLICATION_CBOR)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClass(Ordered::class.java), MediaType.APPLICATION_CBOR)).isFalse()
 	}
 
 
diff --git a/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufDecoderTests.kt b/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufDecoderTests.kt
index 5fcbeaa3579..7f15d7c000a 100644
--- a/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufDecoderTests.kt
+++ b/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufDecoderTests.kt
@@ -20,7 +20,7 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.protobuf.ProtoBuf
 import kotlinx.serialization.serializer
-import org.assertj.core.api.Assertions
+import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import org.springframework.core.Ordered
 import org.springframework.core.ResolvableType
@@ -44,18 +44,18 @@ class KotlinSerializationCborDecoderTests : AbstractDecoderTests<KotlinSerializa
 	@Test
 	override fun canDecode() {
 		for (mimeType in listOf(MediaType.APPLICATION_PROTOBUF, MediaType.APPLICATION_OCTET_STREAM, MediaType("application", "vnd.google.protobuf"))) {
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java),mimeType)).isTrue()
+			assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java),mimeType)).isTrue()
 
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), mimeType)).isTrue()
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), mimeType)).isFalse()
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), mimeType)).isTrue()
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), mimeType)).isTrue()
-			Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Ordered::class.java), mimeType)).isFalse()
+			assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), mimeType)).isTrue()
+			assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), mimeType)).isFalse()
+			assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), mimeType)).isTrue()
+			assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), mimeType)).isTrue()
+			assertThat(decoder.canDecode(ResolvableType.forClass(Ordered::class.java), mimeType)).isFalse()
 		}
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), null)).isTrue()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(String::class.java), null)).isFalse()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
-		Assertions.assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), null)).isTrue()
+		assertThat(decoder.canDecode(ResolvableType.forClass(String::class.java), null)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
+		assertThat(decoder.canDecode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
 	}
 
 	@Test
diff --git a/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufEncoderTests.kt b/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufEncoderTests.kt
index fdd86e46cda..4f0412733f3 100644
--- a/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufEncoderTests.kt
+++ b/spring-web/src/test/kotlin/org/springframework/http/codec/protobuf/KotlinSerializationProtobufEncoderTests.kt
@@ -20,7 +20,7 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.encodeToByteArray
 import kotlinx.serialization.protobuf.ProtoBuf
-import org.assertj.core.api.Assertions
+import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import org.springframework.core.Ordered
 import org.springframework.core.ResolvableType
@@ -52,18 +52,18 @@ class KotlinSerializationProtobufEncoderTests : AbstractEncoderTests<KotlinSeria
 	@Test
 	override fun canEncode() {
 		val pojoType = ResolvableType.forClass(Pojo::class.java)
-		Assertions.assertThat(encoder.canEncode(pojoType, null)).isTrue()
+		assertThat(encoder.canEncode(pojoType, null)).isTrue()
 
 		for (mimeType in ProtobufCodecSupport.MIME_TYPES) {
 			val mediaType = MediaType(mimeType)
-			Assertions.assertThat(encoder.canEncode(pojoType, mediaType)).isTrue()
+			assertThat(encoder.canEncode(pojoType, mediaType)).isTrue()
 
-			Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), mimeType)).isTrue()
-			Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), mimeType)).isFalse()
-			Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), mimeType)).isTrue()
-			Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), mimeType)).isTrue()
+			assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Int::class.java), mimeType)).isTrue()
+			assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Ordered::class.java), mimeType)).isFalse()
+			assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(List::class.java, Pojo::class.java), mimeType)).isTrue()
+			assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), mimeType)).isTrue()
 		}
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClassWithGenerics(ArrayList::class.java, Int::class.java), MediaType.APPLICATION_PDF)).isFalse()
 	}
 
 	@Test
@@ -99,12 +99,12 @@ class KotlinSerializationProtobufEncoderTests : AbstractEncoderTests<KotlinSeria
 
 	@Test
 	fun canNotEncode() {
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(String::class.java), null)).isFalse()
-		Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClass(String::class.java), null)).isFalse()
+		assertThat(encoder.canEncode(ResolvableType.forClass(Pojo::class.java), MediaType.APPLICATION_XML)).isFalse()
 		val sseType = ResolvableType.forClass(ServerSentEvent::class.java)
 		for (mediaType in mediaTypes) {
-			Assertions.assertThat(encoder.canEncode(sseType, mediaType)).isFalse()
-			Assertions.assertThat(encoder.canEncode(ResolvableType.forClass(Ordered::class.java), mediaType)).isFalse()
+			assertThat(encoder.canEncode(sseType, mediaType)).isFalse()
+			assertThat(encoder.canEncode(ResolvableType.forClass(Ordered::class.java), mediaType)).isFalse()
 		}
 	}