Swlft: add explicit SingleValueStmtExpr test

Author: AlexDenisov

swift/ql/.generated.list

@@ -0,0 +1,2 @@
+deadEnd
+| test.swift:1:8:1:13 | x |

swift/ql/.gitattributes

@@ -0,0 +1 @@
+| test.swift:2:3:5:3 | SingleValueStmtExpr | hasType: | yes | getStmt: | test.swift:2:3:5:3 | switch x { ... } |

swift/ql/test/extractor-tests/generated/expr/SingleValueStmtExpr/CONSISTENCY/CfgConsistency.expected

@@ -0,0 +1 @@
+| test.swift:2:3:5:3 | SingleValueStmtExpr | Int |

swift/ql/test/extractor-tests/generated/expr/SingleValueStmtExpr/MISSING_SOURCE.txt

@@ -0,0 +1,6 @@
+func a(_ x: Int) -> Int {
+  switch x {
+  default:
+    0
+  }
+}