Port from deprecated JUnit code.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636052 13f79535-47bb-0310-9956-ffa450edef68
Closed file stream at the end of the test method.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636053 13f79535-47bb-0310-9956-ffa450edef68
Replace <code>foo</code> with {@code foo} on the way to fixing Javadoc 8 errors.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636056 13f79535-47bb-0310-9956-ffa450edef68
Replace bogus <code>foo<code> (note the tag is NOT closed) with {@code foo} on the way to fixing Javadoc 8 errors.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636057 13f79535-47bb-0310-9956-ffa450edef68