diff --git a/internal/resource/mappers/bimapper/bimapper_test.go b/internal/resource/mappers/bimapper/bimapper_test.go
index a18f6dd773815..00dac874bc303 100644
--- a/internal/resource/mappers/bimapper/bimapper_test.go
+++ b/internal/resource/mappers/bimapper/bimapper_test.go
@@ -32,10 +32,13 @@ var (
 		GroupVersion: fakeVersion,
 		Kind:         "Bar",
 	}
+	fakeBazType = &pbresource.Type{
+		Group:        fakeGroupName,
+		GroupVersion: fakeVersion,
+		Kind:         "Baz",
+	}
 )
 
-// TODO(rb): test NewWithWildcardLinkType
-
 func TestMapper(t *testing.T) {
 	// Create an advance pointer to some services.
 
@@ -213,6 +216,134 @@ func TestMapper(t *testing.T) {
 	require.True(t, m.IsEmpty())
 }
 
+func TestMapper_Wildcard(t *testing.T) {
+	bar1Ref := newRef(fakeBarType, "uno")
+	bar2Ref := newRef(fakeBarType, "dos")
+
+	baz1Ref := newRef(fakeBazType, "uno")
+	baz2Ref := newRef(fakeBazType, "dos")
+
+	m := NewWithWildcardLinkType(fakeFooType)
+
+	foo1 := rtest.Resource(fakeFooType, "foo1").
+		WithTenancy(resource.DefaultNamespacedTenancy()).
+		Build()
+	foo1Refs := []resource.ReferenceOrID{
+		bar1Ref,
+		baz1Ref,
+	}
+
+	foo2 := rtest.Resource(fakeFooType, "foo2").
+		WithTenancy(resource.DefaultNamespacedTenancy()).
+		Build()
+	foo2Refs := []resource.ReferenceOrID{
+		bar1Ref,
+		bar2Ref,
+		baz2Ref,
+	}
+	foo2UpdatedRefs := []resource.ReferenceOrID{
+		bar2Ref,
+		baz2Ref,
+	}
+
+	// Nothing tracked yet so we assume nothing.
+	requireLinksForItem(t, m, foo1.Id)
+	requireLinksForItem(t, m, foo2.Id)
+	requireItemsForLink(t, m, bar1Ref)
+	requireItemsForLink(t, m, bar2Ref)
+	requireItemsForLink(t, m, baz1Ref)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// no-ops
+	m.UntrackItem(foo1.Id)
+
+	// still nothing
+	requireLinksForItem(t, m, foo1.Id)
+	requireLinksForItem(t, m, foo2.Id)
+	requireItemsForLink(t, m, bar1Ref)
+	requireItemsForLink(t, m, bar2Ref)
+	requireItemsForLink(t, m, baz1Ref)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// Actually insert some data.
+	m.TrackItem(foo1.Id, foo1Refs)
+
+	// Check links mapping
+	requireLinksForItem(t, m, foo1.Id, foo1Refs...)
+	requireItemsForLink(t, m, bar1Ref, foo1.Id)
+	requireItemsForLink(t, m, bar2Ref)
+	requireItemsForLink(t, m, baz1Ref, foo1.Id)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// track it again, no change
+	m.TrackItem(foo1.Id, foo1Refs)
+
+	requireLinksForItem(t, m, foo1.Id, foo1Refs...)
+	requireItemsForLink(t, m, bar1Ref, foo1.Id)
+	requireItemsForLink(t, m, bar2Ref)
+	requireItemsForLink(t, m, baz1Ref, foo1.Id)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// track new one that overlaps slightly
+	m.TrackItem(foo2.Id, foo2Refs)
+
+	// Check links mapping for the new one
+	requireLinksForItem(t, m, foo1.Id, foo1Refs...)
+	requireLinksForItem(t, m, foo2.Id, foo2Refs...)
+	requireItemsForLink(t, m, bar1Ref, foo1.Id, foo2.Id)
+	requireItemsForLink(t, m, bar2Ref, foo2.Id)
+	requireItemsForLink(t, m, baz1Ref, foo1.Id)
+	requireItemsForLink(t, m, baz2Ref, foo2.Id)
+
+	// update the original to change it
+	m.TrackItem(foo2.Id, foo2UpdatedRefs)
+
+	requireLinksForItem(t, m, foo1.Id, foo1Refs...)
+	requireLinksForItem(t, m, foo2.Id, foo2UpdatedRefs...)
+	requireItemsForLink(t, m, bar1Ref, foo1.Id)
+	requireItemsForLink(t, m, bar2Ref, foo2.Id)
+	requireItemsForLink(t, m, baz1Ref, foo1.Id)
+	requireItemsForLink(t, m, baz2Ref, foo2.Id)
+
+	// delete the original
+	m.UntrackItem(foo1.Id)
+
+	requireLinksForItem(t, m, foo1.Id)
+	requireLinksForItem(t, m, foo2.Id, foo2UpdatedRefs...)
+	requireItemsForLink(t, m, bar1Ref)
+	requireItemsForLink(t, m, bar2Ref, foo2.Id)
+	requireItemsForLink(t, m, baz1Ref)
+	requireItemsForLink(t, m, baz2Ref, foo2.Id)
+
+	// delete the link
+	m.UntrackLink(baz2Ref)
+
+	foo2DoubleUpdatedRefs := []resource.ReferenceOrID{
+		bar2Ref,
+	}
+
+	requireLinksForItem(t, m, foo1.Id)
+	requireLinksForItem(t, m, foo2.Id, foo2DoubleUpdatedRefs...)
+	requireItemsForLink(t, m, bar1Ref)
+	requireItemsForLink(t, m, bar2Ref, foo2.Id)
+	requireItemsForLink(t, m, baz1Ref)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// delete another item
+	m.UntrackItem(foo2.Id)
+
+	requireLinksForItem(t, m, foo1.Id)
+	requireLinksForItem(t, m, foo2.Id)
+	requireItemsForLink(t, m, bar1Ref)
+	requireItemsForLink(t, m, bar2Ref)
+	requireItemsForLink(t, m, baz1Ref)
+	requireItemsForLink(t, m, baz2Ref)
+
+	// Reset the mapper and check that its internal maps are empty.
+	m.Reset()
+	require.True(t, m.IsEmpty())
+}
+
 func TestPanics(t *testing.T) {
 	t.Run("new mapper without types", func(t *testing.T) {
 		require.PanicsWithValue(t, "itemType is required", func() {