[Tests] Add a test for BZip2 truncation handling

The idea here is that BZip2.decompress should not crash for any possible truncation. It should either throw an error or produce an output (if stars align such that truncated input is still a valid BZip2 "archive").

Author: tsolomko

Tests/BZip2Tests.swift

@@ -96,4 +96,15 @@ class BZip2Tests: XCTestCase {
         }
     }
 
+    func testBZip2Truncation() throws {
+        for i in 1...9 {
+            let testName = "test\(i)"
+            let testData = try Constants.data(forTest: testName, withType: BZip2Tests.testType)
+            for _ in 0..<10 {
+                let truncationIndex = Int.random(in: (testData.startIndex + 1)..<testData.endIndex)
+                _ = try? BZip2.decompress(data: testData[testData.startIndex..<truncationIndex])
+            }
+        }
+    }
+
 }