github.com/erda-project/erda-infra@v1.0.9/base/servicehub/dependency-graph/dependency_graph_test.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package graph
    16  
    17  import "fmt"
    18  
    19  func Example_circular() {
    20  	node1 := NewNode("node1", "node2")
    21  	node2 := NewNode("node2", "node3")
    22  	node3 := NewNode("node3", "node1")
    23  	var g Graph
    24  	g = append(g, node1, node2, node3)
    25  	g, err := Resolve(g)
    26  	if err != nil {
    27  		fmt.Println(err)
    28  		// g.Display()
    29  		return
    30  	}
    31  	fmt.Println("OK")
    32  	// Output:
    33  	// Circular dependency found
    34  }
    35  
    36  func Example_ok() {
    37  	node1 := NewNode("node1", "node2")
    38  	node2 := NewNode("node2", "node3")
    39  	node3 := NewNode("node3")
    40  	var g Graph
    41  	g = append(g, node1, node2, node3)
    42  	g, err := Resolve(g)
    43  	if err != nil {
    44  		fmt.Println(err)
    45  		g.Display()
    46  		return
    47  	}
    48  	fmt.Println("OK")
    49  	g.Display()
    50  	// Output:
    51  	// OK
    52  	// node3
    53  	// node2 -> node3
    54  	// node1 -> node2
    55  }