1# Tests of Starlark 'bool'
2
3load("assert.star", "assert")
4
5# truth
6assert.true(True)
7assert.true(not False)
8assert.true(not not True)
9assert.true(not not 1 >= 1)
10
11# precedence of not
12assert.true(not not 2 > 1)
13# assert.true(not (not 2) > 1) # TODO(adonovan): fix: gives error for False > 1.
14# assert.true(not ((not 2) > 1)) # TODO(adonovan): fix
15# assert.true(not ((not (not 2)) > 1)) # TODO(adonovan): fix
16# assert.true(not not not (2 > 1))
17
18# bool conversion
19assert.eq(
20 [bool(), bool(1), bool(0), bool("hello"), bool("")],
21 [False, True, False, True, False],
22)
23
24# comparison
25assert.true(None == None)
26assert.true(None != False)
27assert.true(None != True)
28assert.eq(1 == 1, True)
29assert.eq(1 == 2, False)
30assert.true(False == False)
31assert.true(True == True)
32
33# ordered comparison
34assert.true(False < True)
35assert.true(False <= True)
36assert.true(False <= False)
37assert.true(True > False)
38assert.true(True >= False)
39assert.true(True >= True)
40
41# conditional expression
42assert.eq(1 if 3 > 2 else 0, 1)
43assert.eq(1 if "foo" else 0, 1)
44assert.eq(1 if "" else 0, 0)
45
46# short-circuit evaluation of 'and' and 'or':
47# 'or' yields the first true operand, or the last if all are false.
48assert.eq(0 or "" or [] or 0, 0)
49assert.eq(0 or "" or [] or 123 or 1 // 0, 123)
50assert.fails(lambda : 0 or "" or [] or 0 or 1 // 0, "division by zero")
51
52# 'and' yields the first false operand, or the last if all are true.
53assert.eq(1 and "a" and [1] and 123, 123)
54assert.eq(1 and "a" and [1] and 0 and 1 // 0, 0)
55assert.fails(lambda : 1 and "a" and [1] and 123 and 1 // 0, "division by zero")
56
57# Built-ins that want a bool want an actual bool, not a truth value.
58# See github.com/bazelbuild/starlark/issues/30
59assert.eq(''.splitlines(True), [])
60assert.fails(lambda: ''.splitlines(1), 'got int, want bool')
61assert.fails(lambda: ''.splitlines("hello"), 'got string, want bool')
62assert.fails(lambda: ''.splitlines(0.0), 'got float, want bool')
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