Ok; my favorite awk one-liner I found somewhere and learnt by heart is for extracting "blocks of text between some starting pattern/line and some ending pattern/line"; most often, that would be "functions with particular name, with their whole body". Brace yourselves:

    awk '/^func Test/{p=1}; p; /^}/{p=0}'

EXPLANATION

First of all, this is 3 separate "commands", separated by ';'. In order:

    /^func Test/ {p=1}

— if line matches regexp '^func Test' (i.e., starts with "func Test"), then set variable p to 1 (a.k.a. "True").

    p

— equivalent to any of:

    p { print }
    p { print $0 }
    { if (p) { print $0 } }

meaning: if variable p is true-ish (in case of this script, if p==1), then print current line (if action is not specified after a condition, then it's by default {print}).

    /^}/ {p=0}

— you may have guessed already now: stop printing after encountering end of function (line starting with '}').