Tests for simple palindromes:
-----------------------------
madam: true
racecar: true
10801: true

Negative tests for simple palindromes:
--------------------------------------
abxab: true
dfqgfd: true
1234004320: true

Tests for sentence-length palindromes:
--------------------------------------
A man, a plan, a canal, Panama!: true
Was it a car or a cat I saw?: true
No 'x' in Nixon: true
Able was I ere I saw Elba: true
Madam, I'm Adam: true
Never odd or even: true
Doc, note: I dissent. A fast never prevents a fatness. I diet on cod: true
T. Eliot, top bard, notes putrid tang emanating, is sad; I'd assign it a name: gnat dirt upset on drab pot toilet.: true

Negative tests for sentence-length palindromes:
-----------------------------------------------
Able was I eere I saw Elba: true
abxab: true
dfqgfd: true
1234004320: true