Fix deprecation warnings

* Use `MatcherAssert.assertThat()`
instead of deprecated `Assert.assertThat()`
* Use `IntegrationFlows.fromSupplier(Supplier)`
instead of removed `IntegrationFlows.from(Supplier)`
* Use `org.springframework.integration:spring-integration-test`
throughout the project for more testing utilities

advanced/advanced-testing-examples/pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.integration.samples</groupId>
   <artifactId>advanced-testing-examples</artifactId>
-  <version>5.3.0.RELEASE</version>
+  <version>5.4.0</version>
   <name>Advanced Testing Examples</name>
   <description>Advanced Testing Examples</description>
   <url>https://projects.spring.io/spring-integration</url>
@@ -146,8 +146,8 @@
       </exclusions>
     </dependency>
     <dependency>
-      <groupId>org.springframework</groupId>
-      <artifactId>spring-test</artifactId>
+      <groupId>org.springframework.integration</groupId>
+      <artifactId>spring-integration-test</artifactId>
       <scope>test</scope>
       <exclusions>
         <exclusion>
@@ -181,14 +181,14 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-framework-bom</artifactId>
-        <version>5.2.7.RELEASE</version>
+        <version>5.3.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>
       <dependency>
         <groupId>org.springframework.integration</groupId>
         <artifactId>spring-integration-bom</artifactId>
-        <version>5.3.1.RELEASE</version>
+        <version>5.4.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>

advanced/dynamic-ftp/pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.integration.samples</groupId>
   <artifactId>dynamic-ftp</artifactId>
-  <version>5.3.0.RELEASE</version>
+  <version>5.4.0</version>
   <name>Dynamic FTP Demo</name>
   <description>Dynamic FTP Demo</description>
   <url>https://projects.spring.io/spring-integration</url>
@@ -123,8 +123,8 @@
       </exclusions>
     </dependency>
     <dependency>
-      <groupId>org.springframework</groupId>
-      <artifactId>spring-test</artifactId>
+      <groupId>org.springframework.integration</groupId>
+      <artifactId>spring-integration-test</artifactId>
       <scope>test</scope>
       <exclusions>
         <exclusion>
@@ -158,14 +158,14 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-framework-bom</artifactId>
-        <version>5.2.7.RELEASE</version>
+        <version>5.3.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>
       <dependency>
         <groupId>org.springframework.integration</groupId>
         <artifactId>spring-integration-bom</artifactId>
-        <version>5.3.1.RELEASE</version>
+        <version>5.4.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>

advanced/dynamic-ftp/src/test/java/org/springframework/integration/samples/ftp/FtpOutboundChannelAdapterSample.java

@@ -15,9 +15,9 @@
  */
 package org.springframework.integration.samples.ftp;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;

advanced/dynamic-tcp-client/pom.xml

@@ -4,11 +4,11 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.3.1.RELEASE</version>
+    <version>2.4.0-SNAPSHOT</version>
   </parent>
   <groupId>org.springframework.integration.samples</groupId>
   <artifactId>dynamic-tcp-client</artifactId>
-  <version>5.3.0.RELEASE</version>
+  <version>5.4.0</version>
   <name>Dynamic TCP Client</name>
   <description>Dynamic TCP Client</description>
   <url>https://projects.spring.io/spring-integration</url>
@@ -127,8 +127,8 @@
       </exclusions>
     </dependency>
     <dependency>
-      <groupId>org.springframework</groupId>
-      <artifactId>spring-test</artifactId>
+      <groupId>org.springframework.integration</groupId>
+      <artifactId>spring-integration-test</artifactId>
       <scope>test</scope>
       <exclusions>
         <exclusion>
@@ -174,7 +174,7 @@
       <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-dependencies</artifactId>
-        <version>2.3.1.RELEASE</version>
+        <version>2.4.0-SNAPSHOT</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>
@@ -188,14 +188,14 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-framework-bom</artifactId>
-        <version>5.2.7.RELEASE</version>
+        <version>5.3.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>
       <dependency>
         <groupId>org.springframework.integration</groupId>
         <artifactId>spring-integration-bom</artifactId>
-        <version>5.3.1.RELEASE</version>
+        <version>5.4.0-M1</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>

advanced/pom.xml

@@ -4,7 +4,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.integration.samples</groupId>
   <artifactId>advanced</artifactId>
-  <version>5.3.0.RELEASE</version>
+  <version>5.4.0</version>
   <url>https://projects.spring.io/spring-integration</url>
   <organization>
     <name>SpringIO</name>