Add test for cross-package references with test extraction

go/ql/integration-tests/test-extraction/src/go.mod

@@ -1,3 +1,3 @@
-go 1.14
+go 1.18
 
 module testsample

go/ql/integration-tests/test-extraction/src/pkg1/def.go

@@ -0,0 +1,7 @@
+package pkg1
+
+type Generic[T any] struct {
+	element T
+}
+
+func TestMe() { }

go/ql/integration-tests/test-extraction/src/pkg1/def_test.go

@@ -0,0 +1,5 @@
+package pkg1
+
+func UsePkg1() {
+	TestMe()
+}

go/ql/integration-tests/test-extraction/src/pkg2/use.go

@@ -0,0 +1,12 @@
+package pkg2
+
+import (
+	"testsample/pkg1"
+)
+
+// This tests the case of cross-package generic type references
+// in the presence of test extraction. We need to make sure we
+// extract packages, including test variants, in the right order
+// such that we've seen pkg1.Generic before we try to use it here.
+
+type Specialised = pkg1.Generic[string]

go/ql/integration-tests/test-extraction/test.expected

@@ -1,8 +1,12 @@
 #select
+| src/pkg1/def.go:0:0:0:0 | src/pkg1/def.go |
+| src/pkg1/def_test.go:0:0:0:0 | src/pkg1/def_test.go |
+| src/pkg2/use.go:0:0:0:0 | src/pkg2/use.go |
 | src/testme.go:0:0:0:0 | src/testme.go |
 | src/testme_blackbox_test.go:0:0:0:0 | src/testme_blackbox_test.go |
 | src/testme_test.go:0:0:0:0 | src/testme_test.go |
 calls
+| src/pkg1/def_test.go:4:2:4:9 | call to TestMe | src/pkg1/def.go:7:1:7:17 | function declaration |
 | src/testme_blackbox_test.go:10:18:10:44 | call to PublicFunction | src/testme.go:3:1:3:38 | function declaration |
 | src/testme_test.go:9:18:9:33 | call to PublicFunction | src/testme.go:3:1:3:38 | function declaration |
 | src/testme_test.go:14:19:14:35 | call to privateFunction | src/testme.go:5:1:5:39 | function declaration |