thar we GO

ledger/like.go

@@ -1,6 +1,8 @@
 package ledger
 
-import "regexp"
+import (
+	"regexp"
+)
 
 type Like func(Delta) bool
 
@@ -8,13 +10,13 @@ type likes []Like
 
 func LikeBefore(date string) Like {
 	return func(d Delta) bool {
-		return date <= d.Date
+		return date >= d.Date
 	}
 }
 
 func LikeAfter(date string) Like {
 	return func(d Delta) bool {
-		return date >= d.Date
+		return date <= d.Date
 	}
 }
 

ledger/like_test.go

@@ -2,6 +2,21 @@ package ledger
 
 import "testing"
 
+func TestLikeBeforeAfter(t *testing.T) {
+	if got := LikeBefore("9")(Delta{Date: "2021"}); !got {
+		t.Error("got 2021 is NOT before 9")
+	}
+	if got := LikeBefore("1")(Delta{Date: "2021"}); got {
+		t.Error("got 2021 IS before 1")
+	}
+	if got := LikeAfter("9")(Delta{Date: "2021"}); got {
+		t.Error("got 2021 IS after 9")
+	}
+	if got := LikeAfter("1")(Delta{Date: "2021"}); !got {
+		t.Error("got 2021 is NOT after 1")
+	}
+}
+
 func TestLikeName(t *testing.T) {
 	delta := Delta{Name: "x"}
 	if got := LikeName("^x$")(delta); !got {