C#: Use Gvn comparison instead of StructuralComparisonConfiguration in structuralComparison test.

Author: michaelnebel

csharp/ql/test/library-tests/structuralcomparison/structuralComparison.ql

@@ -1,28 +1,25 @@
 import csharp
 import semmle.code.csharp.commons.StructuralComparison
 
-private class StructuralComparisonTest extends StructuralComparisonConfiguration {
-  StructuralComparisonTest() { this = "StructuralComparisonTest" }
-
-  /**
-   * All pairs of controls flow elements found in the source and within the same
-   * enclosing callable excluding all instances of `ThisAccess` to reduce the size
-   * of the output.
-   */
-  override predicate candidate(ControlFlowElement e1, ControlFlowElement e2) {
-    e1.fromSource() and
-    e2.fromSource() and
-    e1 != e2 and
-    e1.getEnclosingCallable() = e2.getEnclosingCallable() and
-    not e1 instanceof ThisAccess
-  }
+/**
+ * All pairs of controls flow elements found in the source and within the same
+ * enclosing callable excluding all instances of `ThisAccess` to reduce the size
+ * of the output.
+ */
+private predicate candidate(ControlFlowElement x, ControlFlowElement y) {
+  x.fromSource() and
+  y.fromSource() and
+  x != y and
+  x.getEnclosingCallable() = y.getEnclosingCallable() and
+  not x instanceof ThisAccess
 }
 
-query predicate same(ControlFlowElement e1, ControlFlowElement e2) {
-  exists(StructuralComparisonTest sct, Location l1, Location l2 |
-    sct.same(e1, e2) and
-    l1 = e1.getLocation() and
-    l2 = e2.getLocation() and
+query predicate same(ControlFlowElement x, ControlFlowElement y) {
+  exists(Location l1, Location l2 |
+    candidate(x, y) and
+    sameGvn(x, y) and
+    l1 = x.getLocation() and
+    l2 = y.getLocation() and
     (
       l1.getStartLine() < l2.getStartLine()
       or
@@ -31,4 +28,4 @@ query predicate same(ControlFlowElement e1, ControlFlowElement e2) {
   )
 }
 
-query predicate gvn(ControlFlowElement e, Gvn gvn) { gvn = toGvn(e) and e.fromSource() }
+query predicate gvn(ControlFlowElement x, Gvn gvn) { gvn = toGvn(x) and x.fromSource() }