ast/astutil: add test for resolving imports with major version suffix

Currently astutil.Resolve does not understand major version
suffixes, leading to problems with round-tripping files
through astutil.Sanitize.

We a test for this to be fixed by a subsequent CL.

Signed-off-by: Roger Peppe <[email protected]>
Change-Id: I89e49348cc357cc84ffb059facfa70e632bfdf4f
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1207986
Unity-Result: CUE porcuepine <[email protected]>
Reviewed-by: Daniel Martí <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>

cue/ast/astutil/resolve_test.go

@@ -32,7 +32,11 @@ func TestResolve(t *testing.T) {
 	}
 
 	test.Run(t, func(t *cuetxtar.Test) {
-		a := t.Instance()
+		// Use RawInstances because we want to allow imports
+		// without actually providing any dependencies. In general,
+		// Resolve is used just after parsing anyway, so lower level
+		// is more appropriate.
+		a := t.RawInstances()[0]
 
 		for _, f := range a.Files {
 			if filepath.Ext(f.Filename) != ".cue" {

cue/ast/astutil/testdata/resolve/import.txtar

@@ -0,0 +1,19 @@
+-- in.cue --
+import (
+	"foo.com/bar"
+	"foo.com/bar:baz"
+	"other.org/p@v1"
+	"other.org/p@v2:q"
+)
+refs: [
+	bar,
+	baz,
+	p,
+	q,
+]
+-- out/resolve/in --
+7[refs]: Scope: 0[<nil>] Node: 0[]
+8[bar]:  Scope: 0[<nil>] Node: 2["foo.com/bar"]
+9[baz]:  Scope: 0[<nil>] Node: 3["foo.com/bar:baz"]
+10[p]:   Scope: 0[<nil>] Node: 0[]
+11[q]:   Scope: 0[<nil>] Node: 5["other.org/p@v2:q"]