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|
import _SwiftFormatTestSupport
@_spi(Rules) import SwiftFormat
final class UseExplicitNilCheckInConditionsTests: LintOrFormatRuleTestCase {
func testIfExpressions() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if 1️⃣let _ = x {}
if let x = y, 2️⃣let _ = x.m {}
if let x = y {} else if 3️⃣let _ = z {}
""",
expected: """
if x != nil {}
if let x = y, x.m != nil {}
if let x = y {} else if z != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("3️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testGuardStatements() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
guard 1️⃣let _ = x else {}
guard let x = y, 2️⃣let _ = x.m else {}
""",
expected: """
guard x != nil else {}
guard let x = y, x.m != nil else {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testWhileStatements() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
while 1️⃣let _ = x {}
while let x = y, 2️⃣let _ = x.m {}
""",
expected: """
while x != nil {}
while let x = y, x.m != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testTriviaPreservation() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if /*comment*/ 1️⃣let _ = x /*comment*/ {}
if 2️⃣let _ = x // comment
{}
""",
expected: """
if /*comment*/ x != nil /*comment*/ {}
if x != nil // comment
{}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testDoNotDropTrailingCommaInConditionList() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if 1️⃣let _ = x, 2️⃣let _ = y {}
""",
expected: """
if x != nil, y != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testAddNecessaryParenthesesAroundTryExpr() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if 1️⃣let _ = try? x {}
if 2️⃣let _ = try x {}
""",
expected: """
if (try? x) != nil {}
if (try x) != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testAddNecessaryParenthesesAroundTernaryExpr() {
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if 1️⃣let _ = x ? y : z {}
""",
expected: """
if (x ? y : z) != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
func testAddNecessaryParenthesesAroundSameOrLowerPrecedenceOperator() {
// The use of `&&` and `==` are semantically meaningless here because they don't return
// optionals. We just need them to stand in for any potential custom operator with lower or same
// precedence, respectively.
assertFormatting(
UseExplicitNilCheckInConditions.self,
input: """
if 1️⃣let _ = x && y {}
if 2️⃣let _ = x == y {}
""",
expected: """
if (x && y) != nil {}
if (x == y) != nil {}
""",
findings: [
FindingSpec("1️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
FindingSpec("2️⃣", message: "compare this value using `!= nil` instead of binding and discarding it"),
]
)
}
}
|
