Add tests for helper/files.go

Closes hashicorp#72

helper/files_test.go

@@ -0,0 +1,83 @@
+package helper
+
+import (
+	"io/ioutil"
+	"os"
+	"reflect"
+	"testing"
+)
+
+func TestHelper_GetDefaultTmplFile(t *testing.T) {
+	d1 := []byte("Levant Test Job File\n")
+
+	cases := []struct {
+		TmplFiles []string
+		Output    string
+	}{
+		{
+			[]string{"example.nomad", "example1.nomad"},
+			"",
+		},
+		{
+			[]string{"example.nomad"},
+			"example.nomad",
+		},
+	}
+
+	for _, tc := range cases {
+		for _, f := range tc.TmplFiles {
+
+			// Use write file as tmpfile adds a prefix which doesn't work with the
+			// GetDefaultTmplFile function.
+			err := ioutil.WriteFile(f, d1, 0644)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		actual := GetDefaultTmplFile()
+
+		// Call explicit Remove as the function is dependant on the number of files
+		// in the target directory.
+		for _, f := range tc.TmplFiles {
+			os.Remove(f)
+		}
+
+		if !reflect.DeepEqual(actual, tc.Output) {
+			t.Fatalf("got: %#v, expected %#v", actual, tc.Output)
+		}
+	}
+
+}
+
+func TestHelper_GetDefaultVarFile(t *testing.T) {
+	d1 := []byte("Levant Test Variable File\n")
+
+	cases := []struct {
+		VarFile string
+	}{
+		{"levant.yaml"},
+		{"levant.yml"},
+		{"levant.tf"},
+		{""},
+	}
+
+	for _, tc := range cases {
+		if tc.VarFile != "" {
+
+			// Use write file as tmpfile adds a prefix which doesn't work with the
+			// GetDefaultTmplFile function.
+			err := ioutil.WriteFile(tc.VarFile, d1, 0644)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		actual := GetDefaultVarFile()
+		if !reflect.DeepEqual(actual, tc.VarFile) {
+			t.Fatalf("got: %#v, expected %#v", actual, tc.VarFile)
+		}
+
+		os.Remove(tc.VarFile)
+	}
+}