test: add ascii fixtures for edge routing and label placement

Author: PeronGH

cmd/testdata/ascii/bidirectional_edge_labels_lr.txt

@@ -0,0 +1,11 @@
+graph LR
+A -->|workload exits| B
+B -->|run| A
+---
++---+                +-----+
+|   |                |     |
+| A |workload-exits->|  B  |
+|   |                |     |
++---+                +-----+
+  ^                    run  
+  +---------------------+   

cmd/testdata/ascii/bidirectional_edge_labels_td.txt

@@ -0,0 +1,19 @@
+graph TD
+A -->|forward| B
+B -->|back| A
+---
++---------+      
+|         |      
+|    A    |<--+  
+|         |   |  
++---------+   |  
+     |        |  
+     |        |  
+  forward   back 
+     |        |  
+     v        |  
++---------+   |  
+|         |   |  
+|    B    |---+  
+|         |      
++---------+      

cmd/testdata/ascii/duplicate_edge_labels.txt

@@ -0,0 +1,11 @@
+graph LR
+A -->|miss| B
+A -->|hit| B
+---
++-----+      +---+
+|     |      |   |
+|  A  |miss->| B |
+|     |      |   |
++-----+      +---+
+  hit          ^  
+   +-----------+  

cmd/testdata/ascii/explicit_label_after_bare_reference.txt

@@ -0,0 +1,29 @@
+graph TD
+A["Foo"] --> B["Bar"]
+B --> C["Baz"]
+---
++-----+
+|     |
+| Foo |
+|     |
++-----+
+   |   
+   |   
+   |   
+   |   
+   v   
++-----+
+|     |
+| Bar |
+|     |
++-----+
+   |   
+   |   
+   |   
+   |   
+   v   
++-----+
+|     |
+| Baz |
+|     |
++-----+

cmd/testdata/ascii/subgraph_standalone_labeled_node.txt

@@ -0,0 +1,25 @@
+graph TD
+subgraph one
+    A["VcpuManager"]
+end
+A --> B
+---
++-----------------+
+|       one       |
+|                 |
+|                 |
+| +-------------+ |
+| |             | |
+| | VcpuManager | |
+| |             | |
+| +-------------+ |
+|        |        |
++--------|--------+
+         |         
+         |         
+         v         
+  +-------------+  
+  |             |  
+  |      B      |  
+  |             |  
+  +-------------+