1 files changed, 62 insertions, 0 deletions
diff --git a/src/cmd/go/testdata/script/mod_replace_readonly.txt b/src/cmd/go/testdata/script/mod_replace_readonly.txt
new file mode 100644
index 0000000000..882c755337
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_replace_readonly.txt
@@ -0,0 +1,62 @@
+# Check that with -mod=readonly, when we load a package in a module that is
+# replaced but not required, we emit an error with the command to add the
+# requirement.
+# Verifies golang.org/issue/41416, golang.org/issue/41577.
+cp go.mod go.mod.orig
+
+# Replace all versions of a module without requiring it.
+# With -mod=mod, we'd add a requirement for a "zero" pseudo-version, but we
+# can't in readonly mode, since its go.mod may alter the build list.
+go mod edit -replace rsc.io/quote=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; try ''go get -d rsc.io/quote'' to add it$'
+go get -d rsc.io/quote
+cmp go.mod go.mod.latest
+go list rsc.io/quote
+cp go.mod.orig go.mod
+
+# Same test with a specific version.
+go mod edit -replace rsc.io/quote@v1.0.0-doesnotexist=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; try ''go get -d rsc.io/quote@v1.0.0-doesnotexist'' to add it$'
+go get -d rsc.io/quote@v1.0.0-doesnotexist
+cmp go.mod go.mod.specific
+go list rsc.io/quote
+cp go.mod.orig go.mod
+
+# If there are multiple versions, the highest is suggested.
+go mod edit -replace rsc.io/quote@v1.0.0-doesnotexist=./quote
+go mod edit -replace rsc.io/quote@v1.1.0-doesnotexist=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; try ''go get -d rsc.io/quote@v1.1.0-doesnotexist'' to add it$'
+
+-- go.mod --
+module m
+
+go 1.16
+-- go.mod.latest --
+module m
+
+go 1.16
+
+replace rsc.io/quote => ./quote
+
+require rsc.io/quote v1.5.2 // indirect
+-- go.mod.specific --
+module m
+
+go 1.16
+
+replace rsc.io/quote v1.0.0-doesnotexist => ./quote
+
+require rsc.io/quote v1.0.0-doesnotexist // indirect
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+-- quote/go.mod --
+module rsc.io/quote
+
+go 1.16
+-- quote/quote.go --
+package quote