From a6f907c688a5b2b41450ea57d449538f8b8da8b9 Mon Sep 17 00:00:00 2001
From: Megan Marsh <megan@hashicorp.com>
Date: Wed, 17 Mar 2021 10:48:55 -0700
Subject: [PATCH] tests

---
 hcl2template/function/datetime_test.go | 64 ++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 hcl2template/function/datetime_test.go

diff --git a/hcl2template/function/datetime_test.go b/hcl2template/function/datetime_test.go
new file mode 100644
index 000000000..1d90ce53e
--- /dev/null
+++ b/hcl2template/function/datetime_test.go
@@ -0,0 +1,64 @@
+package function
+
+import (
+	"fmt"
+	"regexp"
+	"testing"
+	"time"
+
+	"github.com/zclconf/go-cty/cty"
+)
+
+// HCL template usage example:
+//
+// locals {
+//   emptyformat  = legacy_isotime()
+//   golangformat = legacy_isotime("01-02-2006")
+// }
+
+func TestLegacyIsotime_empty(t *testing.T) {
+	got, err := LegacyIsotimeFunc.Call([]cty.Value{})
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+
+	_, err = time.Parse(time.RFC3339, got.AsString())
+	if err != nil {
+		t.Fatalf("Didn't get an RFC3339 string from empty case: %s", err)
+	}
+
+}
+
+func TestLegacyIsotime_inputs(t *testing.T) {
+	tests := []struct {
+		Value cty.Value
+		Want  string
+	}{
+		{
+			cty.StringVal("01-02-2006"),
+			`^\d{2}-\d{2}-\d{4}$`,
+		},
+		{
+			cty.StringVal("Mon Jan 02, 2006"),
+			`^(Mon|Tues|Wed|Thu|Fri|Sat|Sun){1} (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec){1} \d{2}, \d{4}$`,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("legacy_isotime(%#v)", test.Value), func(t *testing.T) {
+			got, err := LegacyIsotime(test.Value)
+
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			re, err := regexp.Compile(test.Want)
+			if err != nil {
+				t.Fatalf("Bad regular expression test string: %#v", err)
+			}
+
+			if !re.MatchString(got.AsString()) {
+				t.Errorf("wrong result\ngot:  %#v\nwant: %#v", got, test.Want)
+			}
+		})
+	}
+}