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pipeline_test.go
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pipeline_test.go
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package pipes
import (
"bytes"
"log"
"strings"
"testing"
)
func TestMakeLinks(t *testing.T) {
t.Run("Testing with 10 values", func(t *testing.T) {
numChannels(t, "", 10)
})
t.Run("Testing with 0 values", func(t *testing.T) {
numChannels(t, commandNil, 0)
})
t.Run("Testing with negative values", func(t *testing.T) {
numChannels(t, negativeChannels, -10)
})
}
func TestCommandExecute(t *testing.T) {
stdErr := new(bytes.Buffer)
executer := &OsExec{Cmds: []string{"echo", "hello"}}
node, err := NewNodeState(executer)
if err != nil {
t.Fatal(err)
}
ipChan := make(chan *bytes.Buffer)
opChan := make(chan *bytes.Buffer)
t.Run("Checking with correct command", func(t *testing.T) {
execCmd(t, &ipChan, &opChan, stdErr, node, "hello")
})
executer = &OsExec{Cmds: []string{"lsw"}}
node, err = NewNodeState(executer)
if err != nil {
t.Fatal(err)
}
t.Run("Checking with incorrect command", func(t *testing.T) {
execCmd(t, &ipChan, &opChan, stdErr, node, commandNotFound)
})
}
func execCmd(t *testing.T, ipChan, opChan *chan *bytes.Buffer, stdErr *bytes.Buffer, node Node, want string) {
t.Helper()
go firstStdin(*ipChan)
go nodeExecute(node, *ipChan, *opChan, stdErr)
gotBuffer := <-*opChan
got := gotBuffer.String()
if !strings.ContainsAny(got, want) {
//check in stderr file
e := make([]byte, 100)
stdErr.Read(e)
if !strings.Contains(string(e), want) {
t.Fatalf("Should have received error executing command, got %s want %s", string(e), want)
}
//t.Fatalf("pipeline execution failure got: %s want: %s", got, want)
}
}
func TestRunWithCorrectCommand(t *testing.T) {
commands := []Executer{
&OsExec{[]string{"echo", "hello"}},
}
want := "hello"
pipe := NewPipeline(commands)
out, _ := pipe.Run()
// if err.Error() != "" {
// log.Fatalf("Error received, got %s, want %s", err.Error(), want)
// }
if !strings.Contains(out, want) {
log.Fatalf("Error in running command, got %s, want %s", out, want)
}
}
func TestRunWithInCorrectCommand(t *testing.T) {
commands := []Executer{
&OsExec{[]string{"lsw", "hello"}},
}
want := commandNotFound
pipe := NewPipeline(commands)
_, err := pipe.Run()
if err.Error() == "" {
log.Fatalf("Error received, got %s, want %s", err.Error(), want)
}
if !strings.Contains(err.Error(), want) {
log.Fatalf("Error in running command, got %s, want %s", err.Error(), want)
}
}
// commands = []Commander{}
// pipe = NewPipeline(commands)
// t.Run("Sending 0 commands", func(t *testing.T) {
// runCmd(pipe, commands, commandNil)
// })
// commands = []Commander{
// &OsExec{[]string{"lsw"}},
// }
// pipe = NewPipeline(commands)
// t.Run("Sending wrong commands", func(t *testing.T) {
// runCmd(pipe, commands, commandNotFound)
// })
//}
// func runCmd(pipe *Pipeline, commands []Commander, want string) {
// out, err := pipe.Run()
// if err.Error() != "" {
// if !strings.Contains(err.Error(), want) {
// log.Fatalf("Should have received error, got %s, want %s", err.Error(), want)
// } else {
// var b []byte
// pipe.stderr.Read(b)
// if !strings.Contains(string(b), want) {
// log.Fatalf("")
// }
// }
// } else {
// if !strings.Contains(out, want) {
// log.Fatalf("Contains Output mismatched, got %s want %s", out, want)
// }
// }
// }
// helper
func numChannels(t *testing.T, msg string, value int) {
t.Helper()
numofCmd := value
gotChan, err := makeLinks(numofCmd)
if err != nil {
if err.Error() != msg {
t.Fatalf("Should have received an error, got %s, wanted %s", err.Error(), msg)
}
} else {
got := len(gotChan)
want := value + 1
//should be numOfCmd +1 channels
if got != want {
t.Fatalf("Num of channels should be num of cmd +1 got: %d want : %d ", got, want)
}
}
}