JDK 14 RFR of JDK-8233940: Preview API tests for String methods should use ${jdk.version} as -source arg

[Joe Darcy]

Hello,

To remove the need to modify tests when the JDK version is updated, the 
tests of the preview API in String should use "${jdk.version}" as an 
argument to -source rather than a fixed version string:

     JDK-8233940: Preview API tests for String methods should use 
${jdk.version} as -source arg
     http://cr.openjdk.java.net/~darcy/8233940.0/

The new TEST.properties file only affects tests in the java/lang/String 
directory. Some additional work is needed before jtreg "smart actions" 
can be enabled throughout the tests in the "jdk" directory as they are 
already in "langtools".

Patch below.

Thanks,

-Joe

--- old/test/jdk/java/lang/String/Formatted.java    2019-11-11 
22:09:42.692005000 -0800
+++ new/test/jdk/java/lang/String/Formatted.java    2019-11-11 
22:09:42.476005000 -0800
@@ -25,7 +25,7 @@
   * @test
   * bug 8203444
   * @summary Unit tests for instance versions of String#format
- * @compile --enable-preview -source 14 Formatted.java
+ * @compile --enable-preview -source ${jdk.version} Formatted.java
   * @run main/othervm --enable-preview Formatted
   */

--- old/test/jdk/java/lang/String/StripIndent.java    2019-11-11 
22:09:43.376005000 -0800
+++ new/test/jdk/java/lang/String/StripIndent.java    2019-11-11 
22:09:43.120005000 -0800
@@ -25,7 +25,7 @@
   * @test
   * @bug 8223775
   * @summary This exercises String#stripIndent patterns and limits.
- * @compile --enable-preview -source 14 StripIndent.java
+ * @compile --enable-preview -source ${jdk.version} StripIndent.java
   * @run main/othervm --enable-preview StripIndent
   */

--- old/test/jdk/java/lang/String/TranslateEscapes.java  2019-11-11 
22:09:44.020005000 -0800
+++ new/test/jdk/java/lang/String/TranslateEscapes.java  2019-11-11 
22:09:43.776005000 -0800
@@ -25,7 +25,7 @@
   * @test
   * @bug 8223780
   * @summary This exercises String#translateEscapes patterns and limits.
- * @compile --enable-preview -source 14 TranslateEscapes.java
+ * @compile --enable-preview -source ${jdk.version} TranslateEscapes.java
   * @run main/othervm --enable-preview TranslateEscapes
   */

--- /dev/null    2019-09-13 10:19:35.768000000 -0700
+++ new/test/jdk/java/lang/String/TEST.properties    2019-11-11 
22:09:44.396005000 -0800
@@ -0,0 +1 @@
+allowSmartActionArgs=true