Used this TAP Stream while testing:

1..2
ok 1
—
extensions:
files:
sample.txt:
File-Type: text/plain
File-Name: sample.txt
File-Size: 43
File-Content: c2FtcGxl
...
ok2

Will attach an evidence of how it looks like after the changes.

Code changed in jenkins
User: Bruno P. Kinoshita
Path:
src/main/java/org/tap4j/plugin/TapResult.java
src/main/java/org/tap4j/plugin/util/DiagnosticUtil.java
src/main/resources/org/tap4j/plugin/TapResult/index.jelly
src/main/resources/org/tap4j/plugin/tags/line.jelly
src/main/resources/org/tap4j/plugin/tags/yaml.jelly
http://jenkins-ci.org/commit/tap-plugin/3eff2031f16f744d8b7484c119982a9160fd7377
Log:
[FIXED JENKINS-15497] Display link to download YAMLish attachments.

Code changed in jenkins
User: Bruno P. Kinoshita
Path:
src/main/java/org/tap4j/plugin/TapResult.java
http://jenkins-ci.org/commit/tap-plugin/15d48ef54b7aa44aa9d69c7fe957904888251d93
Log:
JENKINS-15497 Fixing incorrect if, where we were comparing the value with
the key name, while we should use the key value instead.

Code changed in jenkins
User: Bruno P. Kinoshita
Path:
src/main/java/org/tap4j/plugin/TapResult.java
src/main/java/org/tap4j/plugin/model/TapAttachment.java
http://jenkins-ci.org/commit/tap-plugin/a4a18a7d5e5570216c725a66d264407ba19c0bd9
Log:
JENKINS-15497 Adding a new object to represent a TapAttachment. This new design allows us to send the file-size, file-name and other values found in a map diagnostics

Fixed in 1.6