diff --git a/tests/__data__/input/validate/duplicate/blocklist.csv b/tests/__data__/input/validate/duplicate/blocklist.csv
new file mode 100644
index 00000000..dcfba40d
--- /dev/null
+++ b/tests/__data__/input/validate/duplicate/blocklist.csv
@@ -0,0 +1,3 @@
+channel,ref
+002RadioTV.do,eee
+002RadioTV.do,eee
\ No newline at end of file
diff --git a/tests/__data__/input/validate/duplicate/channels.csv b/tests/__data__/input/validate/duplicate/channels.csv
new file mode 100644
index 00000000..22a83c3a
--- /dev/null
+++ b/tests/__data__/input/validate/duplicate/channels.csv
@@ -0,0 +1,2 @@
+id,name,alt_names,network,owners,country,subdivision,city,broadcast_area,languages,categories,is_nsfw,launched,closed,replaced_by,website,logo
+002RadioTV.do,002 Radio TV,,,,DO,,,c/DO,,,FALSE,,,,,https://i.imgur.com/7oNe8xj.png
\ No newline at end of file
diff --git a/tests/__data__/input/validate/duplicate/countries.csv b/tests/__data__/input/validate/duplicate/countries.csv
new file mode 100644
index 00000000..8a1c05e5
--- /dev/null
+++ b/tests/__data__/input/validate/duplicate/countries.csv
@@ -0,0 +1,3 @@
+name,code,languages,flag
+Andorra,AD,cat,🇦🇩
+Dominican Republic,DO,spa,🇩🇴
\ No newline at end of file
diff --git a/tests/__data__/input/validate/duplicate/languages.csv b/tests/__data__/input/validate/duplicate/languages.csv
new file mode 100644
index 00000000..7e3eb4b4
--- /dev/null
+++ b/tests/__data__/input/validate/duplicate/languages.csv
@@ -0,0 +1,3 @@
+code,name
+cat,Catalan
+spa,Spanish
\ No newline at end of file
diff --git a/tests/__data__/input/validate/duplicate/subdivisions.csv b/tests/__data__/input/validate/duplicate/subdivisions.csv
new file mode 100644
index 00000000..9498b609
--- /dev/null
+++ b/tests/__data__/input/validate/duplicate/subdivisions.csv
@@ -0,0 +1,2 @@
+country,name,code
+AD,Andorra la Vella,AD-07
\ No newline at end of file