fix(TestRun): get previous node

src/conductor/TestRun/TestNode.ts

@@ -32,10 +32,10 @@ export abstract class TestNodeStack extends EventEmitter<TestEventMap> {
     }
 
     get previousNode(): TestNodeStack {
-        return this.previousSibling ?? this.parent ?? getLastLeaf(this)
+        return getPreviousNode(this)
     }
     get nextNode(): TestNodeStack {
-        return this.children?.first ?? getNextBranch(this)
+        return getNextNode(this)
     }
 }
 
@@ -75,10 +75,10 @@ export abstract class TestNodeInstance extends EventEmitter<TestEventMap>{
     }
 
     get previousNode(): TestNodeInstance {
-        return this.previousSibling ?? this.parent ?? getLastLeaf(this)
+        return getPreviousNode(this)
     }
     get nextNode(): TestNodeInstance {
-        return this.children?.first ?? getNextBranch(this)
+        return getNextNode(this)
     }
 }
 
@@ -155,6 +155,19 @@ export class TestNodeChildren<T, Ident = string> implements Iterable<[T, Ident,
     }
 }
 
+function getPreviousNode<T extends TestNodeStack|TestNodeInstance>(node: T) {
+    for (let n = node;;) {
+        const previousSibling = n.previousSibling
+        if (previousSibling) {
+            return getLastLeaf(previousSibling as T)
+        } else if (n.parent) {
+            return n.parent as T
+        } else {
+            return getLastLeaf(n)
+        }
+    }
+}
+
 function getLastLeaf<T extends TestNodeStack|TestNodeInstance>(node: T) {
     for (let n = node;;) {
         const lastChild = n.children?.last
@@ -166,6 +179,10 @@ function getLastLeaf<T extends TestNodeStack|TestNodeInstance>(node: T) {
     }
 }
 
+function getNextNode<T extends TestNodeStack|TestNodeInstance>(node: T) {
+    return (node.children?.first ?? getNextBranch(node)) as T
+}
+
 function getNextBranch<T extends TestNodeStack|TestNodeInstance>(node: T) {
     for (let n = node;;) {
         const nextSibling = n.nextSibling