Add utils function for addon descriptor (#1919)

* adding ReadAddonDescriptor

* Update abaputils_test.go

pkg/abaputils/abaputils_test.go

@@ -1,6 +1,9 @@
 package abaputils
 
 import (
+	"fmt"
+	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/SAP/jenkins-library/pkg/command"
@@ -242,3 +245,61 @@ func TestTimeConverter(t *testing.T) {
 		assert.Equal(t, expectedDate, result.String(), "Dates do not match after conversion")
 	})
 }
+
+func TestReadAddonDescriptor(t *testing.T) {
+	t.Run("Test: success case", func(t *testing.T) {
+
+		dir, err := ioutil.TempDir("", "test read addon descriptor")
+		if err != nil {
+			t.Fatal("Failed to create temporary directory")
+		}
+		oldCWD, _ := os.Getwd()
+		_ = os.Chdir(dir)
+		// clean up tmp dir
+		defer func() {
+			_ = os.Chdir(oldCWD)
+			_ = os.RemoveAll(dir)
+		}()
+
+		body := `---
+addonProduct: /DMO/myAddonProduct
+addonVersion: 3.1.4
+addonUniqueId: myAddonId
+customerID: 1234
+repositories:
+- name: /DMO/REPO_A
+  tag: v-1.0.1-build-0001
+  branch: branchA
+  version: 1.0.1
+- name: /DMO/REPO_B
+  tag: rel-2.1.1-build-0001
+  branch: branchB
+  version: 2.1.1
+`
+		file, _ := os.Create("filename.yaml")
+		file.Write([]byte(body))
+
+		addonDescriptor, err := ReadAddonDescriptor("filename.yaml")
+		assert.NoError(t, err)
+		assert.Equal(t, `/DMO/myAddonProduct`, addonDescriptor.AddonProduct)
+		assert.Equal(t, `3.1.4`, addonDescriptor.AddonVersion)
+		assert.Equal(t, `myAddonId`, addonDescriptor.AddonUniqueID)
+		assert.Equal(t, float64(1234), addonDescriptor.CustomerID)
+		assert.Equal(t, ``, addonDescriptor.AddonSpsLevel)
+		assert.Equal(t, `/DMO/REPO_A`, addonDescriptor.Repositories[0].Name)
+		assert.Equal(t, `/DMO/REPO_B`, addonDescriptor.Repositories[1].Name)
+		assert.Equal(t, `v-1.0.1-build-0001`, addonDescriptor.Repositories[0].Tag)
+		assert.Equal(t, `rel-2.1.1-build-0001`, addonDescriptor.Repositories[1].Tag)
+		assert.Equal(t, `branchA`, addonDescriptor.Repositories[0].Branch)
+		assert.Equal(t, `branchB`, addonDescriptor.Repositories[1].Branch)
+		assert.Equal(t, `1.0.1`, addonDescriptor.Repositories[0].Version)
+		assert.Equal(t, `2.1.1`, addonDescriptor.Repositories[1].Version)
+		assert.Equal(t, ``, addonDescriptor.Repositories[0].SpsLevel)
+		assert.Equal(t, ``, addonDescriptor.Repositories[1].SpsLevel)
+	})
+
+	t.Run("Test: file does not exist", func(t *testing.T) {
+		_, err := ReadAddonDescriptor("filename.yaml")
+		assert.EqualError(t, err, fmt.Sprintf("Could not find %v.", "filename.yaml"))
+	})
+}