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Copy pathwarn_control_flow_test.go
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warn_control_flow_test.go
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/*
Copyright 2020 Google LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package warn
import "testing"
func TestMissingReturnValueWarning(t *testing.T) {
// empty return
checkFindings(t, "return-value", `
def foo():
if x:
return x
else:
return
`, []string{
`:5: Some but not all execution paths of "foo" return a value.`,
}, scopeEverywhere)
// empty return; implicit return in the end
checkFindings(t, "return-value", `
def bar():
if x:
pass
elif y:
return y
else:
for z in t:
return
`, []string{
`:1: Some but not all execution paths of "bar" return a value.
The function may terminate by an implicit return in the end.`,
`:8: Some but not all execution paths of "bar" return a value.`,
}, scopeEverywhere)
// implicit return in the end
checkFindings(t, "return-value", `
def foo():
if x:
return x
else:
bar()
`, []string{
`:1: Some but not all execution paths of "foo" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
// implicit return in the end
checkFindings(t, "return-value", `
def bar():
if x:
return x
elif y:
return y
else:
foo
if z:
return z
if foo:
return not foo
`, []string{
`:1: Some but not all execution paths of "bar" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
// only returned values and fail() statements, ok
checkFindings(t, "return-value", `
def bar():
if x:
return x
elif y:
return y
else:
foo
if z:
return z
if foo:
return not foo
else:
fail("unreachable")
`, []string{}, scopeEverywhere)
// implicit return in the end because fail() is not a statement
checkFindings(t, "return-value", `
def bar():
if x:
return x
elif y:
return y
else:
foo
if z:
return z
if foo:
return not foo
else:
foo() or fail("unreachable")
`, []string{
`:1: Some but not all execution paths of "bar" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
// only empty returns, ok
checkFindings(t, "return-value", `
def bar():
if x:
x()
elif y:
return
else:
foo
if z:
fail()
if foo:
return
`, []string{}, scopeEverywhere)
// no returns, ok
checkFindings(t, "return-value", `
def foobar():
pass
`, []string{}, scopeEverywhere)
// only fails, ok
checkFindings(t, "return-value", `
def foobar():
if foo:
fail()
`, []string{}, scopeEverywhere)
// nested functions, no errors
checkFindings(t, "return-value", `
def foo():
def bar():
pass
return bar
`, []string{}, scopeEverywhere)
// nested functions, missing return value in the outer function
checkFindings(t, "return-value", `
def foo():
def bar():
pass
if bar():
return 42
`, []string{
`:1: Some but not all execution paths of "foo" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
// nested functions, missing return value in the inner function
checkFindings(t, "return-value", `
def foo():
def bar():
if something:
return something
if bar():
return 42
return 43
`, []string{
`:2: Some but not all execution paths of "bar" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
// nested functions, missing return value in both
checkFindings(t, "return-value", `
def foo():
def bar():
if something:
return something
if bar():
return 42
`, []string{
`:1: Some but not all execution paths of "foo" return a value.
The function may terminate by an implicit return in the end.`,
`:2: Some but not all execution paths of "bar" return a value.
The function may terminate by an implicit return in the end.`,
}, scopeEverywhere)
}
func TestUnreachableStatementWarning(t *testing.T) {
// after return
checkFindings(t, "unreachable", `
def foo():
return
bar()
baz()
`, []string{
`:3: The statement is unreachable.`,
}, scopeEverywhere)
// two returns
checkFindings(t, "unreachable", `
def foo():
return 1
return 2
`, []string{
`:3: The statement is unreachable.`,
}, scopeEverywhere)
// after fail()
checkFindings(t, "unreachable", `
def foo():
fail("die")
bar()
baz()
`, []string{
`:3: The statement is unreachable.`,
}, scopeEverywhere)
// after break and continue
checkFindings(t, "unreachable", `
def foo():
for x in y:
if x:
break
bar() # unreachable
if y:
continue
bar() # unreachable
def bar():
for x in y:
if x:
break
elif y:
continue
else:
return x
foo() # unreachable
foobar() # potentially reachable
`, []string{
`:5: The statement is unreachable.`,
`:8: The statement is unreachable.`,
`:19: The statement is unreachable.`,
}, scopeEverywhere)
// ok
checkFindings(t, "unreachable", `
def foo():
if x:
return
bar()
`, []string{}, scopeEverywhere)
// ok
checkFindings(t, "unreachable", `
def foo():
x() or fail("maybe")
bar()
`, []string{}, scopeEverywhere)
// unreacheable statement inside a nested function
checkFindings(t, "unreachable", `
def foo():
def bar():
fail("die")
baz()
`, []string{
`:4: The statement is unreachable.`,
}, scopeEverywhere)
}
func TestNoEffect(t *testing.T) {
checkFindings(t, "no-effect", `
"""Docstring."""
def bar():
"""Other Docstring"""
fct()
pass
return 2
[f() for i in rang(3)] # top-level comprehension is okay
`,
[]string{},
scopeEverywhere)
checkFindings(t, "no-effect", `
def foo():
[fct() for i in range(3)]
`,
[]string{":2: Expression result is not used. Use a for-loop instead"},
scopeEverywhere)
checkFindings(t, "no-effect", `None`,
[]string{":1: Expression result is not used."},
scopeEverywhere)
checkFindings(t, "no-effect", `
foo # 1
foo()
def bar():
[1, 2] # 5
if True:
"string" # 7
`,
[]string{":1:", ":5:", ":7:"},
scopeEverywhere)
checkFindings(t, "no-effect", `
# A comment
"""A docstring"""
# Another comment
"""Not a docstring"""
def bar():
"""A docstring"""
foo
""" Not a docstring"""
return foo
`,
[]string{
":7: Expression result is not used. Docstrings should be the first statements of a file or a function (they may follow comment lines).",
":11: Expression result is not used.",
":12: Expression result is not used. Docstrings should be the first statements of a file or a function (they may follow comment lines).",
}, scopeEverywhere)
checkFindings(t, "no-effect", `
foo == bar
foo = bar
a + b
c // d
-e
foo != bar
foo += bar
bar -= bar
`,
[]string{":1:", ":3:", ":4:", ":5:", ":6:"},
scopeEverywhere)
checkFindings(t, "no-effect", `
def foo():
"""Doc."""
def bar():
"""Doc."""
foo == bar
`,
[]string{":5:"},
scopeEverywhere)
}
func TestWarnUnusedVariable(t *testing.T) {
checkFindings(t, "unused-variable", `
load(":f.bzl", "x")
x = "unused"
y = "also unused"
z = "name"
t = "unused by design" # @unused
_foo, _bar = pair #@unused
cc_library(name = z)
def f():
pass
def g():
pass
g() + 3
`,
[]string{":2: Variable \"x\" is unused.",
":3: Variable \"y\" is unused.",
":9: Function \"f\" is unused."},
scopeDeclarative)
checkFindings(t, "unused-variable", `
a = 1
b = 2
c = 3
d = (a if b else c) # only d is unused
`,
[]string{":4: Variable \"d\" is unused."},
scopeDeclarative)
checkFindings(t, "unused-variable", `
_a = 1
_a += 2
_b = 3
print(_b)
def _f(): pass
def _g(): pass
_g()
`,
[]string{
":1: Variable \"_a\" is unused.",
":6: Function \"_f\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
a = 1
def foo(
x,
y = 0,
z = 1):
b = 2
c = 3
d = (a if b else c) # only d is unused
e = 7
f = 8 # @unused
# @unused
g = 9
return e + z
foo()
`,
[]string{
":4: Variable \"x\" is unused.",
":5: Variable \"y\" is unused.",
":9: Variable \"d\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
a = 1
def foo(a):
b = 2
return a
def foo():
pass
def bar(c, cc):
d = 3
print(c)
def baz():
foo()
d = 4
return a
bar()
`,
[]string{
":4: Variable \"b\" is unused.",
":10: Variable \"cc\" is unused.",
":11: Variable \"d\" is unused.",
":14: Function \"baz\" is unused.",
":16: Variable \"d\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
a = 1
b = 2
c = 3
def bar(
x = a + baz(c = 4),
y = b):
pass
foo()
`,
[]string{
":4: Variable \"c\" is unused.",
":6: Function \"bar\" is unused.",
":7: Variable \"x\" is unused.",
":8: Variable \"y\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
a = 1
b = 2
c = [x for a in aa if a % b for x in a]
return c
foo()
`,
[]string{
":2: Variable \"a\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
a = 1
b = 2
c = [
a + b
for a in [b for b in bb if b]
if a
]
return c
foo()
`,
[]string{
":2: Variable \"a\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
a = 1
b = 2
def bar(*args):
def baz(**kwargs):
def foobar(*a,
**kw):
return b
return foobar(**kwargs)
return baz(*args)
return bar()
foo()
`,
[]string{
":2: Variable \"a\" is unused.",
":7: Variable \"a\" is unused.",
":8: Variable \"kw\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
a = 1
b = 2
c = 3
d = 4
e, f = 5, 6
for x, yy in xx:
for (y, z, _, _t) in yy:
print(a + y)
if bar:
print(c)
elif baz:
print(d)
else:
print(e)
foo()
`,
[]string{
":3: Variable \"b\" is unused.",
":6: Variable \"f\" is unused.",
":8: Variable \"x\" is unused.",
":9: Variable \"z\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo():
# @unused
def bar():
pass
def baz():
pass
foo()
`,
[]string{
":7: Function \"baz\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo(my_iterable, arg, _some_unused_argument, _also_unused = None, *_args, **_kwargs):
a, b, _c = 1, 2, 3 # ok to not use _c
print(a)
_d, _e = 4, 5 # all are underscored
print(_d)
for f, g, _h, _ in my_iterable: # ok to not use any underscored
print(f)
for _i, (_j, _k) in another_iterable: # ok to not use any of them
pass
[1 for (_y, _z) in bar]
foo()
`,
[]string{
":1: Variable \"arg\" is unused.",
":3: Variable \"b\" is unused.",
":6: Variable \"_e\" is unused.",
":9: Variable \"g\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo(
x,
_y,
z, # @unused
t = 42, #@unused
*args, # @unused
**kwargs, ### also @unused
):
pass
foo()
`,
[]string{
":2: Variable \"x\" is unused.",
},
scopeEverywhere)
checkFindings(t, "unused-variable", `
def foo(
name,
x):
pass
def bar(
name = "",
y = 3):
pass
foo()
bar()
`,
[]string{
":3: Variable \"x\" is unused.",
":9: Variable \"y\" is unused.",
},
scopeEverywhere)
}
func TestRedefinedVariable(t *testing.T) {
checkFindings(t, "redefined-variable", `
x = "old_value"
x = "new_value"
x[1] = "new"
cc_library(name = x)`,
[]string{":2: Variable \"x\" has already been defined."},
scopeEverywhere)
checkFindings(t, "redefined-variable", `
x = "a"
def foo():
x = "b"
y = "c"
y = "d"
def bar():
x = "e"
y = "f"
y = "g"`,
[]string{},
scopeEverywhere)
checkFindings(t, "redefined-variable", `
x = [1, 2, 3]
y = [a for a in b]
z = list()
n = 43
x += something()
y += something()
z += something()
n += something()
x -= something()`,
[]string{
":9: Variable \"n\" has already been defined.",
":10: Variable \"x\" has already been defined.",
},
scopeEverywhere)
checkFindings(t, "redefined-variable", `
x = [1, 2, 3]
y = [a for a in b]
z = list()
a = something()
b = something()
c = something()
d = something()
e = something()
a += x
b += y
c += z
d += [42]
e += foo`,
[]string{
":15: Variable \"e\" has already been defined.",
},
scopeEverywhere)
}
func TestWarnUnusedLoad(t *testing.T) {
checkFindingsAndFix(t, "load", `
load(":f.bzl", "s1", "s2")
load(":bar.bzl", "s1")
foo(name = s1)`, `
load(":f.bzl", "s1")
load(":bar.bzl", "s1")
foo(name = s1)`,
[]string{
":1: Loaded symbol \"s2\" is unused.",
":2: A different symbol \"s1\" has already been loaded on line 1.",
},
scopeEverywhere)
checkFindingsAndFix(t, "load", `
load("foo", "b", "a", "c")
load("foo", "a", "d", "e")
z = a + b + d`, `
load("foo", "a", "b")
load("foo", "d")
z = a + b + d`,
[]string{
":1: Loaded symbol \"c\" is unused.",
":2: Symbol \"a\" has already been loaded on line 1.",
":2: Loaded symbol \"e\" is unused.",
},
scopeEverywhere)
checkFindingsAndFix(t, "load", `
load("foo", "a")
a(1)
load("bar", "a")
a(2)
load("bar", a = "a")
a(3)
load("bar", a = "b")
a(4)
load("foo", "a")
a(5)
load("foo", "a")
a(6)
load("foo", a = "a")
a(7)`, `
load("foo", "a")
a(1)
load("bar", "a")
a(2)
a(3)
load("bar", a = "b")
a(4)
load("foo", "a")
a(5)
a(6)
a(7)`,
[]string{
":3: A different symbol \"a\" has already been loaded on line 1.",
":5: Symbol \"a\" has already been loaded on line 3.",
":7: A different symbol \"a\" has already been loaded on line 5.",
":9: A different symbol \"a\" has already been loaded on line 7.",
":11: Symbol \"a\" has already been loaded on line 9.",
":13: Symbol \"a\" has already been loaded on line 11.",
},
scopeEverywhere)
checkFindingsAndFix(t, "load", `
load(
":f.bzl",
"s1",
"s2", # @unused (s2)
)
# @unused - both s3 and s4
load(
":f.bzl",
"s3",
"s4",
)`, `
load(
":f.bzl",
"s2", # @unused (s2)
)
# @unused - both s3 and s4
load(
":f.bzl",
"s3",
"s4",
)`,
[]string{":3: Loaded symbol \"s1\" is unused."},
scopeEverywhere)
checkFindingsAndFix(t, "load", `
load(":f.bzl", "x")
x = "unused"`, `
x = "unused"`,
[]string{":1: Loaded symbol \"x\" is unused."},
scopeEverywhere)
checkFindings(t, "load", `
load(
":f.bzl",
"s1",
)
def test(x: s1):
pass
`,
[]string{},
scopeEverywhere)
checkFindings(t, "load", `
load(
":f.bzl",
"s1",
"s2",
)
def test(x: s1) -> List[s2]:
pass
`,
[]string{},
scopeEverywhere)
checkFindingsAndFix(t, "load", `
load(
":f.bzl",
"s1",
"s2",
)
load(
":s.bzl",
"s3",
)
def test(x: s1) -> List[s2]:
pass
`, `
load(
":f.bzl",
"s1",
"s2",
)
def test(x: s1) -> List[s2]:
pass
`,
[]string{
":9: Loaded symbol \"s3\" is unused.",
},
scopeEverywhere)
}
func TestUninitializedVariable(t *testing.T) {
checkFindings(t, "uninitialized", `
def foo(x):
if bar:
x = 1
y = 2
bar = True
print(x + y)
`,
[]string{
":2: Variable \"bar\" may not have been initialized.",
":7: Variable \"y\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
for t in s:
x = 1
y = 2
print(x + y)
`,
[]string{
":6: Variable \"y\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo():
if bar:
x = 1
y = 2
else:
if foobar:
x = 3
y = 4
else:
x = 5
print(x + y)
`,
[]string{
":12: Variable \"y\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
if bar:
t = 1
else:
for t in maybe_empty:
pass
print(t)
`,
[]string{
":8: Variable \"t\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
if bar:
t = 1
else:
for y in maybe_empty:
return
print(t)
`,
[]string{
":8: Variable \"t\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
if bar:
for t in [2, 3]:
pass
print(t)
`,
[]string{
":6: Variable \"t\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
print(t) # maybe global or loaded
`,
[]string{},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo(x):
if bar:
y = 1
print(y)
x, y = y, x
print(y)
`,
[]string{
":5: Variable \"y\" may not have been initialized.",
":6: Variable \"y\" may not have been initialized.",
},
scopeEverywhere)
checkFindings(t, "uninitialized", `
def foo():
if a:
x = 1