[BAEL-1626] testing-modules | A Quick Guide to @TestPropertySource - move to existing submodule (#5292)

* *added tests using testpropertysource

* fix: using property for version in pom file

* fix, added dependency with compile scope to build successfully on mvn clean install

* * moved testpropertysource tests from spring-context-tests to spring-tests submodule

* deleted  submodule created for this article, since it was moved

testing-modules/spring-testing/src/main/java/com/baeldung/testpropertysource/ClassUsingProperty.java

@@ -0,0 +1,15 @@
+package com.baeldung.testpropertysource;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ClassUsingProperty {
+    
+    @Value("${baeldung.testpropertysource.one}")
+    private String propertyOne;
+    
+    public String retrievePropertyOne() {
+        return propertyOne;
+    }
+}