added code examples for consumer-driven-contract tests with Pact

pact-spring-data-rest-provider/src/test/java/com/example/framework/PactProperties.java

@@ -0,0 +1,61 @@
+package com.example.framework;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+@ConfigurationProperties("pact")
+public class PactProperties {
+
+  private Map<String, String> databaseStates;
+
+  /**
+   * Retrieves a map with the names of the configured database states as keys and {@link DatabaseState} objects
+   * as values.
+   */
+  public List<DatabaseState> getDatabaseStatesList() {
+    List<DatabaseState> databaseStatesList = new ArrayList<>();
+    for (Map.Entry<String, String> entry : databaseStates.entrySet()) {
+      String stateName = entry.getKey();
+
+      // When reading a property as a Map, as is done for databaseStates, Spring Boot automatically adds numeric
+      // keys and moves the actual key into the value, separated by a comma. Thus, we have all entries duplicated
+      // and have to remove the entries with numeric keys.
+
+      if(!stateName.matches("^[0-9]+$")) {
+        String sqlScriptsString = entry.getValue();
+        String[] sqlScripts = sqlScriptsString.split(",");
+        databaseStatesList.add(new DatabaseState(stateName, sqlScripts));
+      }
+    }
+    return databaseStatesList;
+  }
+
+
+  static List<String> toCommandLineArguments(List<DatabaseState> databaseStates) {
+    List<String> args = new ArrayList<>();
+    for (DatabaseState databaseState : databaseStates) {
+      String argString = String.format("--pact.databaseStates.%s=", databaseState.getStateName());
+      int i = 0;
+      for (String scriptPath : databaseState.getSqlscripts()) {
+        argString += String.format("%s", scriptPath);
+        if (i < databaseState.getSqlscripts().length - 1) {
+          argString += ",";
+        }
+        i++;
+      }
+      args.add(argString);
+    }
+    return args;
+  }
+
+  public Map<String, String> getDatabaseStates() {
+    return databaseStates;
+  }
+
+  public void setDatabaseStates(Map<String, String> databaseStates) {
+    this.databaseStates = databaseStates;
+  }
+}