[test] work around a linux testing issue

Author: glessard

test/stdlib/StringAPICString.swift

@@ -239,9 +239,13 @@ CStringTests.test("String.cString.with.Array.UInt8.input") {
     }
   }
   // no need to test every case; that is covered in other tests
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(cString:) must be null-terminated"
   )
+  #endif
   _ = String(cString: [] as [UInt8])
   expectUnreachable()
 }
@@ -260,9 +264,13 @@ CStringTests.test("String.cString.with.Array.CChar.input") {
     }
   }
   // no need to test every case; that is covered in other tests
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(cString:) must be null-terminated"
   )
+  #endif
   _ = String(cString: [] as [CChar])
   expectUnreachable()
 }
@@ -285,9 +293,13 @@ CStringTests.test("String.cString.with.inout.UInt8.conversion") {
   var str = String(cString: &c)
   expectTrue(str.isEmpty)
   c = 100
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(cString:) must be null-terminated"
   )
+  #endif
   str = String(cString: &c)
   expectUnreachable()
 }
@@ -297,9 +309,13 @@ CStringTests.test("String.cString.with.inout.CChar.conversion") {
   var str = String(cString: &c)
   expectTrue(str.isEmpty)
   c = 100
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(cString:) must be null-terminated"
   )
+  #endif
   str = String(cString: &c)
   expectUnreachable()
 }
@@ -319,9 +335,13 @@ CStringTests.test("String.validatingUTF8.with.Array.input") {
     }
   }
   // no need to test every case; that is covered in other tests
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(validatingUTF8:) must be null-terminated"
   )
+  #endif
   _ = String(validatingUTF8: [])
   expectUnreachable()
 }
@@ -347,9 +367,13 @@ CStringTests.test("String.validatingUTF8.with.inout.conversion") {
   expectNotNil(str)
   expectEqual(str?.isEmpty, true)
   c = 100
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(validatingUTF8:) must be null-terminated"
   )
+  #endif
   str = String(validatingUTF8: &c)
   expectUnreachable()
 }
@@ -370,9 +394,13 @@ CStringTests.test("String.decodeCString.with.Array.input") {
     }
   }
   // no need to test every case; that is covered in other tests
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of decodeCString(_:as:repairingInvalidCodeUnits:) must be null-terminated"
   )
+  #endif
   _ = String.decodeCString([], as: Unicode.UTF8.self)
   expectUnreachable()
 }
@@ -405,9 +433,13 @@ CStringTests.test("String.decodeCString.with.inout.conversion") {
   expectEqual(result?.result.isEmpty, true)
   expectEqual(result?.repairsMade, false)
   c = 100
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of decodeCString(_:as:repairingInvalidCodeUnits:) must be null-terminated"
   )
+  #endif
   result = String.decodeCString(&c, as: Unicode.UTF8.self)
   expectUnreachable()
 }
@@ -426,9 +458,13 @@ CStringTests.test("String.init.decodingCString.with.Array.input") {
     }
   }
   // no need to test every case; that is covered in other tests
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of decodeCString(_:as:repairingInvalidCodeUnits:) must be null-terminated"
   )
+  #endif
   _ = String(decodingCString: [], as: Unicode.UTF8.self)
   expectUnreachable()
 }
@@ -451,9 +487,13 @@ CStringTests.test("String.init.decodingCString.with.inout.conversion") {
   var str = String(decodingCString: &c, as: Unicode.UTF8.self)
   expectEqual(str.isEmpty, true)
   c = 100
+  #if os(Linux)
+  expectCrashLater()
+  #else
   expectCrashLater(
     withMessage: "input of String.init(decodingCString:as:) must be null-terminated"
   )
+  #endif
   str = String(decodingCString: &c, as: Unicode.UTF8.self)
   expectUnreachable()
 }