Removed `file.Exists()` as it's not needed.

cmd/diff.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"github.com/microsoft/abstrakt/internal/diff"
 	"github.com/microsoft/abstrakt/internal/platform/constellation"
-	"github.com/microsoft/abstrakt/tools/file"
 	"github.com/microsoft/abstrakt/tools/logger"
 	"github.com/spf13/cobra"
 	"strings"
@@ -39,18 +38,10 @@ Example: abstrakt diff -o [constellationFilePathOriginal] -n [constellationFileP
 			logger.Debugf("showOriginalOutput: %t", *cc.showOriginal)
 			logger.Debugf("showNewOutput: %t", *cc.showNew)
 
-			if !file.Exists(cc.constellationFilePathOrg) {
-				return fmt.Errorf("Could not open original YAML input file for reading %v", cc.constellationFilePathOrg)
-			}
-
-			if !file.Exists(cc.constellationFilePathNew) {
-				return fmt.Errorf("Could not open new YAML input file for reading %v", cc.constellationFilePathNew)
-			}
-
 			dsGraphOrg := new(constellation.Config)
 			err := dsGraphOrg.LoadFile(cc.constellationFilePathOrg)
 			if err != nil {
-				return fmt.Errorf("dagConfigService failed to load file %q: %s", cc.constellationFilePathOrg, err)
+				return fmt.Errorf("Constellation config failed to load file %q: %s", cc.constellationFilePathOrg, err)
 			}
 
 			if *cc.showOriginal {
@@ -66,7 +57,7 @@ Example: abstrakt diff -o [constellationFilePathOriginal] -n [constellationFileP
 			dsGraphNew := new(constellation.Config)
 			err = dsGraphNew.LoadFile(cc.constellationFilePathNew)
 			if err != nil {
-				return fmt.Errorf("dagConfigService failed to load file %q: %s", cc.constellationFilePathNew, err)
+				return fmt.Errorf("Constellation config failed to load file %q: %s", cc.constellationFilePathNew, err)
 			}
 
 			if *cc.showNew {

cmd/diff_test.go

@@ -22,14 +22,14 @@ func TestDiffCmdWithAllRequirementsNoError(t *testing.T) {
 // TestDffCmdFailYaml - test diff command parameters
 // Test both required command line parameters (-o, -n) failing each in turn
 func TestDffCmdFailYaml(t *testing.T) {
-	expected := "Could not open original YAML input file for reading constellationPathOrg"
+	expected := "Constellation config failed to load file \"constellationPathOrg\": open constellationPathOrg: no such file or directory"
 
 	_, err := helper.ExecuteCommand(newDiffCmd().cmd, "-o", "constellationPathOrg", "-n", "constellationPathNew")
 
 	assert.Error(t, err)
 	assert.EqualError(t, err, expected)
 
-	expected = "Could not open new YAML input file for reading constellationPathNew"
+	expected = "Constellation config failed to load file \"constellationPathNew\": open constellationPathNew: no such file or directory"
 
 	_, err = helper.ExecuteCommand(newDiffCmd().cmd, "-o", "../examples/constellation/sample_constellation.yaml", "-n", "constellationPathNew")
 
@@ -40,7 +40,7 @@ func TestDffCmdFailYaml(t *testing.T) {
 // TestDiffCmdFailNotYaml - test diff command parameters
 // Test both required command line parameter files fail when provided with invalid input files (-o, -n) failing each in turn
 func TestDiffCmdFailNotYaml(t *testing.T) {
-	expected := "dagConfigService failed to load file \"diff.go\": yaml: line 26: mapping values are not allowed in this context"
+	expected := "Constellation config failed to load file \"diff.go\": yaml: line 25: mapping values are not allowed in this context"
 
 	_, err := helper.ExecuteCommand(newDiffCmd().cmd, "-o", "diff.go", "-n", "diff.go")
 

cmd/visualise.go

@@ -9,7 +9,6 @@ import (
 	"bytes"
 	"fmt"
 	"github.com/microsoft/abstrakt/internal/platform/constellation"
-	"github.com/microsoft/abstrakt/tools/file"
 	"github.com/microsoft/abstrakt/tools/logger"
 	"github.com/spf13/cobra"
 	"strings"
@@ -34,14 +33,10 @@ Example: abstrakt visualise -f [constellationFilePath]`,
 			logger.Debug("args: " + strings.Join(args, " "))
 			logger.Debug("constellationFilePath: " + cc.constellationFilePath)
 
-			if !file.Exists(cc.constellationFilePath) {
-				return fmt.Errorf("Could not open YAML input file for reading %v", cc.constellationFilePath)
-			}
-
 			dsGraph := new(constellation.Config)
 			err := dsGraph.LoadFile(cc.constellationFilePath)
 			if err != nil {
-				return fmt.Errorf("dagConfigService failed to load file %q: %s", cc.constellationFilePath, err)
+				return fmt.Errorf("Constellation config failed to load file %q: %s", cc.constellationFilePath, err)
 			}
 
 			out := &bytes.Buffer{}

cmd/visualise_test.go

@@ -23,7 +23,7 @@ func TestVisualiseCmdWithAllRequirementsNoError(t *testing.T) {
 }
 
 func TestVisualiseCmdFailYaml(t *testing.T) {
-	expected := "Could not open YAML input file for reading"
+	expected := "Constellation config failed to load file"
 
 	_, err := helper.ExecuteCommand(newVisualiseCmd().cmd, "-f", "constellationPath")
 
@@ -32,7 +32,7 @@ func TestVisualiseCmdFailYaml(t *testing.T) {
 }
 
 func TestVisualiseCmdFailNotYaml(t *testing.T) {
-	expected := "dagConfigService failed to load file"
+	expected := "Constellation config failed to load file"
 
 	_, err := helper.ExecuteCommand(newVisualiseCmd().cmd, "-f", "visualise.go")