git diff example

file1:
This is A teast line
Another testing sentence
let's showthe difference

file2:
This is a test line
One more bit of text
let's show the difference

git diff file1 file2:
-This is A teast line
-Another testing sentence
-let's showthe difference
+This is a test line
+One more bit of text
+let's show the difference

git diff --word-diff file1 file2:
This is [-A teast-]{+a test+} line
[-Another testing sentence-]{+One more bit of text+}
let's [-showthe-]{+show the+} difference

desired output:
This is [-A teast-]{+a test+} line
[-Another testing sentence-]
{+One more bit of text+}
let's [-showthe-]{+show the+} difference