cmd/go: update tests to work with -mod=readonly on by default

For #40728

Change-Id: Ic2b025ff75c6e73c0cb58c1737e44e2a41c71571
Reviewed-on: https://go-review.googlesource.com/c/go/+/253837
Run-TryBot: Jay Conrod <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>
Reviewed-by: Bryan C. Mills <[email protected]>

Author: Jay Conrod

src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.0.0.txt

@@ -6,3 +6,5 @@ module example.com/retract/missingmod
 go 1.14
 -- .info --
 {"Version":"v1.0.0"}
+-- missingmod.go --
+package missingmod

src/cmd/go/testdata/script/mod_auth.txt

@@ -7,7 +7,7 @@ env GOSUMDB=off
 # Without credentials, downloading a module from a path that requires HTTPS
 # basic auth should fail.
 env NETRC=$WORK/empty
-! go list all
+! go mod tidy
 stderr '^\tserver response: ACCESS DENIED, buddy$'
 stderr '^\tserver response: File\? What file\?$'
 

src/cmd/go/testdata/script/mod_case.txt

@@ -1,6 +1,6 @@
 env GO111MODULE=on
 
-go get rsc.io/QUOTE
+go get -d
 go list -m all
 stdout '^rsc.io/quote v1.5.2'
 stdout '^rsc.io/QUOTE v1.5.2'
@@ -18,3 +18,8 @@ stdout '[email protected]!p!r!e'
 
 -- go.mod --
 module x
+
+-- use.go --
+package use
+
+import _ "rsc.io/QUOTE/QUOTE"

src/cmd/go/testdata/script/mod_concurrent.txt

@@ -1,6 +1,7 @@
 env GO111MODULE=on
 
 # Concurrent builds should succeed, even if they need to download modules.
+go get -d ./x ./y
 go build ./x &
 go build ./y
 wait

src/cmd/go/testdata/script/mod_doc.txt

@@ -1,6 +1,7 @@
 # go doc should find module documentation
 
 env GO111MODULE=on
+env GOFLAGS=-mod=mod
 [short] skip
 
 # Check when module x is inside GOPATH/src.
@@ -48,6 +49,7 @@ stderr '^doc: cannot find module providing package example.com/hello: module loo
 # path used in source code, not to the absolute path relative to GOROOT.
 
 cd $GOROOT/src
+env GOFLAGS=
 go doc cryptobyte
 stdout '// import "golang.org/x/crypto/cryptobyte"'
 

src/cmd/go/testdata/script/mod_domain_root.txt

@@ -2,7 +2,7 @@
 # (example.com not example.com/something)
 
 env GO111MODULE=on
-go build
+go get -d
 
 -- go.mod --
 module x

src/cmd/go/testdata/script/mod_download.txt

@@ -46,7 +46,7 @@ go mod edit -require rsc.io/[email protected]
 ! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
 
 # module loading will page in the info and mod files
-go list -m all
+go list -m -mod=mod all
 exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
 exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
 ! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip

src/cmd/go/testdata/script/mod_download_partial.txt

@@ -1,5 +1,5 @@
-# Download a module
-go mod download -modcacherw rsc.io/quote
+# Download modules and populate go.sum.
+go get -d -modcacherw
 exists $GOPATH/pkg/mod/rsc.io/[email protected]/go.mod
 
 # 'go mod verify' should fail if we delete a file.
@@ -61,4 +61,9 @@ go 1.14
 
 require rsc.io/quote v1.5.2
 
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+
 -- empty --

src/cmd/go/testdata/script/mod_get_incompatible.txt

@@ -1,6 +1,6 @@
 env GO111MODULE=on
 
-go list x
+go get -d x
 go list -m all
 stdout 'rsc.io/breaker v2.0.0\+incompatible'
 

src/cmd/go/testdata/script/mod_get_indirect.txt

@@ -27,7 +27,7 @@ grep 'golang.org/x/text v0.3.0 // indirect$' go.mod
 
 # indirect tag should be removed upon seeing direct import.
 cp $WORK/tmp/uselang.go x.go
-go list
+go get -d
 grep 'rsc.io/quote v1.5.2$' go.mod
 grep 'golang.org/x/text [v0-9a-f\.-]+$' go.mod