Fix failing nuget job (#180)

internal/resolution/pm/nuget/job.go

@@ -60,11 +60,16 @@ func (j *Job) Run() {
 var osRemoveAll = os.RemoveAll
 
 func (j *Job) runInstallCmd() ([]byte, string, error) {
-
 	j.nugetCommand = nuget
 	installCmd, err := j.cmdFactory.MakeInstallCmd(j.nugetCommand, j.GetFile())
+
 	if err != nil {
-		return nil, installCmd.String(), err
+		command := ""
+		if installCmd != nil {
+			command = installCmd.String()
+		}
+
+		return nil, command, err
 	}
 
 	installCmdOutput, err := installCmd.Output()

internal/resolution/pm/nuget/job_test.go

@@ -146,3 +146,22 @@ func TestRunInstallCmdOutputErr(t *testing.T) {
 
 	jobTestdata.AssertPathErr(t, j.Errors())
 }
+
+func TestNoCmdOutputError(t *testing.T) {
+	cmdErr := errors.New("")
+	cmdFactoryMock := testdata.NewEmptyCmdFactory()
+	cmdFactoryMock.MakeErr = cmdErr
+
+	expectedError := util.NewPMJobError("\n")
+	expectedError.SetStatus("installing dependencies")
+
+	j := NewJob("file", true, cmdFactoryMock)
+
+	go jobTestdata.WaitStatus(j)
+	j.Run()
+
+	allErrors := j.Errors().GetAll()
+
+	assert.Len(t, j.Errors().GetAll(), 1)
+	assert.Contains(t, allErrors, expectedError)
+}

internal/resolution/pm/nuget/testdata/empty_cmd_factory_mock.go

@@ -0,0 +1,21 @@
+package testdata
+
+import (
+	"os/exec"
+)
+
+type EmptyCmdFactoryMock struct {
+	MakeErr error
+}
+
+func NewEmptyCmdFactory() EmptyCmdFactoryMock {
+	return EmptyCmdFactoryMock{}
+}
+
+func (f EmptyCmdFactoryMock) MakeInstallCmd(_ string, _ string) (*exec.Cmd, error) {
+	return nil, f.MakeErr
+}
+
+func (f EmptyCmdFactoryMock) GetTempoCsproj() string {
+	return ""
+}