internal/mod: more tests

This CL adds some tests for behavior that changes with subsequent
CLs in this chain.

Also adjust some tests so they are using legitimate import
paths with a valid package name implied from the import path.

 For #3155

Signed-off-by: Roger Peppe <rogpeppe@gmail.com>
Change-Id: Ia811527f0389b422e916b4eb472600b2640569f5
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1195279
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

internal/mod/modimports/modimports_test.go

@@ -90,6 +90,11 @@ import "other"
 -- omitted --
 -- y.cue --
 package y
+-- sub/x.cue --
+package x
+import (
+	"imported-from-sub.com/foo"
+)
 `))
 	tfs := txtarfs.FS(dirContents)
 	imps, err := AllImports(PackageFiles(tfs, ".", "*"))
@@ -111,4 +116,7 @@ package y
 	imps, err = AllImports(PackageFiles(tfs, "foo", "*"))
 	qt.Assert(t, qt.IsNil(err))
 	qt.Assert(t, qt.DeepEquals(imps, []string{"other"}))
+	imps, err = AllImports(PackageFiles(tfs, "sub", "x"))
+	qt.Assert(t, qt.IsNil(err))
+	qt.Assert(t, qt.DeepEquals(imps, []string{"imported-from-sub.com/foo"}))
 }

internal/mod/modimports/testdata/simple.txtar

@@ -4,6 +4,7 @@ y/y1.cue "dep3" "dep4"
 y/y2.cue
 y/z1.cue
 y/z2.cue
+z.cue
 -- want-imports --
 dep1
 dep2:a
@@ -40,6 +41,9 @@ package z
 -- y/z2.cue --
 package z
 
+-- z.cue --
+package example
+
 -- _omitted1/foo.cue --
 not even looked at
 

internal/mod/modload/testdata/tidy/canuseprerelease.txtar

@@ -2,7 +2,7 @@
 # no stable releases available.
 
 -- tidy-check-error --
-module is not tidy: cannot find module providing package example.com@v0
+module is not tidy: cannot find module providing package example.com@v0:main
 -- want --
 module: "main.org@v0"
 language: {
@@ -20,7 +20,7 @@ language: version: "v0.8.0"
 -- main.cue --
 package main
 
-import "example.com@v0"
+import "example.com@v0:main"
 
 -- _registry/example.com_v0.0.1-foo/cue.mod/module.cue --
 module: "example.com@v0"

internal/mod/modload/testdata/tidy/implied-major-version-with-explicit-default.txtar

@@ -26,7 +26,7 @@ deps: {
 -- main.cue --
 package main
 
-import "example.com"
+import "example.com:main"
 
 -- _registry/example.com_v0.0.1/cue.mod/module.cue --
 module: "example.com@v0"

internal/mod/modload/testdata/tidy/preferstable.txtar

@@ -22,7 +22,7 @@ language: {
 -- main.cue --
 package main
 
-import "example.com@v0"
+import "example.com@v0:main"
 
 -- _registry/example.com_v0.0.1/cue.mod/module.cue --
 module: "example.com@v0"

internal/mod/modpkgload/testdata/multidir.txtar

@@ -0,0 +1,32 @@
+-- test0/initial-requirements --
+main.test@v0
+example.com@v0.0.1
+-- test0/root-packages --
+main.test@v0:main
+-- test0/default-major-versions --
+-- test0/want --
+main.test@v0:main
+	flags: inAll,isRoot,fromRoot,importsLoaded
+	mod: main.test@v0
+	location: .
+	imports:
+		example.com/blah@v0
+example.com/blah@v0
+	flags: inAll,isRoot,fromRoot,importsLoaded
+	mod: example.com@v0.0.1
+	location: _registry/example.com_v0.0.1/blah
+-- main.cue --
+package main
+import "example.com/blah@v0"
+
+-- _registry/example.com_v0.0.1/cue.mod/module.cue --
+module: "example.com@v0"
+language: version: "v0.8.0"
+-- _registry/example.com_v0.0.1/blah/blah.cue --
+package blah
+-- _registry/example.com_v0.0.1/x.cue --
+package blah
+import _ "foo.com/bar/hello/goodbye@v0"
+-- _registry/example.com_v0.0.1/y.cue --
+package other
+import _ "foo.com/bar/somethingelse@v0"

internal/mod/modpkgload/testdata/nocuefiles.txtar

@@ -0,0 +1,28 @@
+-- test0/initial-requirements --
+main.test@v0
+example.com@v0.0.1
+-- test0/root-packages --
+main.test@v0:main
+-- test0/default-major-versions --
+-- test0/want --
+main.test@v0:main
+	flags: inAll,isRoot,fromRoot,importsLoaded
+	mod: main.test@v0
+	location: .
+	imports:
+		example.com/blah@v0
+example.com/blah@v0
+	flags: inAll,isRoot,fromRoot,importsLoaded
+	mod: example.com@v0.0.1
+	location: _registry/example.com_v0.0.1/blah
+-- main.cue --
+package main
+import "example.com/blah@v0"
+
+-- _registry/example.com_v0.0.1/cue.mod/module.cue --
+module: "example.com@v0"
+language: version: "v0.8.0"
+-- _registry/example.com_v0.0.1/blah/x.cue --
+package a
+-- _registry/example.com_v0.0.1/blah/other/other.cue --
+package b