remove random shuffling while forming network pair

integration-tests/ccip-tests/testconfig/README.md

@@ -528,7 +528,7 @@ Specifies the number of routers to be set up for each network.
 
 ### CCIP.Groups.[testgroup].MaxNoOfLanes
 Specifies the maximum number of lanes to be set up between networks. If this values is not set, the test will set up lanes between all possible pairs of networks mentioned in `selected_networks` in [CCIP.Env.Networks](#ccipenvnetworksselectednetworks).
-For example, if `selected_networks = ['SIMULATED_1', 'SIMULATED_2', 'SIMULATED_3']`, and `MaxNoOfLanes` is set to 3, it denotes that the test will randomly select 3 lanes between all possible pairs `SIMULATED_1`, `SIMULATED_2`, and `SIMULATED_3` for the test run.
+For example, if `selected_networks = ['SIMULATED_1', 'SIMULATED_2', 'SIMULATED_3']`, and `MaxNoOfLanes` is set to 2, it denotes that the test will select the first 2 lanes between all possible pairs `SIMULATED_1`, `SIMULATED_2`, and `SIMULATED_3` for the test run.
 
 ### CCIP.Groups.[testgroup].ChaosDuration
 Specifies the duration for which the chaos experiment is to be run. This is only valid if the test type is 'chaos'.

integration-tests/ccip-tests/testsetups/ccip.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"math/big"
-	"math/rand"
 	"os"
 	"regexp"
 	"strings"
@@ -286,11 +285,8 @@ func (c *CCIPTestConfig) SetNetworkPairs(lggr zerolog.Logger) error {
 		c.AddPairToNetworkList(c.SelectedNetworks[0], c.SelectedNetworks[1])
 	}
 
-	// if the number of lanes is lesser than the number of network pairs, choose a random subset of network pairs
+	// if the number of lanes is lesser than the number of network pairs, choose first c.TestGroupInput.MaxNoOfLanes pairs
 	if c.TestGroupInput.MaxNoOfLanes > 0 && c.TestGroupInput.MaxNoOfLanes < len(c.NetworkPairs) {
-		rand.Shuffle(len(c.NetworkPairs), func(i, j int) {
-			c.NetworkPairs[i], c.NetworkPairs[j] = c.NetworkPairs[j], c.NetworkPairs[i]
-		})
 		c.NetworkPairs = c.NetworkPairs[:c.TestGroupInput.MaxNoOfLanes]
 	}