diff --git a/tests/checks/test.fish b/tests/checks/test.fish
index cce83f0cf..6d4c8aafd 100644
--- a/tests/checks/test.fish
+++ b/tests/checks/test.fish
@@ -15,3 +15,40 @@ test 5 -eq nan
 
 test -z nan || echo nan is fine
 # CHECK: nan is fine
+
+test 1 =
+# CHECKERR: test: Missing argument at index 3
+# CHECKERR: 1 =
+# CHECKERR: ^
+# CHECKERR: {{.*}}test.fish (line {{\d+}}):
+# CHECKERR: test 1 =
+# CHECKERR: ^
+
+test 1 = 2 and echo true or echo false
+# CHECKERR: test: Expected a combining operator like '-a' at index 4
+# CHECKERR: 1 = 2 and echo true or echo false
+# CHECKERR: ^
+# CHECKERR: {{.*}}test.fish (line {{\d+}}):
+# CHECKERR: test 1 = 2 and echo true or echo false
+# CHECKERR: ^
+
+function t
+    test $argv[1] -eq 5
+end
+
+t foo
+# CHECKERR: Invalid argument: 'foo'
+# CHECKERR: {{.*}}test.fish (line {{\d+}}):
+# CHECKERR: test $argv[1] -eq 5
+# CHECKERR: ^
+# CHECKERR: in function 't' with arguments 'foo'
+# CHECKERR: called on line {{\d+}} of file {{.*}}test.fish
+
+t 5,2
+# CHECKERR: Integer 5 in '5,2' followed by non-digit
+# CHECKERR: {{.*}}test.fish (line {{\d+}}):
+# CHECKERR: test $argv[1] -eq 5
+# CHECKERR: ^
+# CHECKERR: in function 't' with arguments '5,2'
+# CHECKERR: called on line {{\d+}} of file {{.*}}test.fish
+