diff --git a/graph/path/a_star_test.go b/graph/path/a_star_test.go
index e4bd3c57..95a75f9f 100644
--- a/graph/path/a_star_test.go
+++ b/graph/path/a_star_test.go
@@ -10,7 +10,6 @@ import (
 	"testing"
 
 	"gonum.org/v1/gonum/graph"
-	"gonum.org/v1/gonum/graph/path/internal"
 	"gonum.org/v1/gonum/graph/path/internal/testgraphs"
 	"gonum.org/v1/gonum/graph/simple"
 	"gonum.org/v1/gonum/graph/topo"
@@ -27,7 +26,7 @@ var aStarTests = []struct {
 	{
 		name: "simple path",
 		g: func() graph.Graph {
-			return internal.NewGridFrom(
+			return testgraphs.NewGridFrom(
 				"*..*",
 				"**.*",
 				"**.*",
@@ -40,20 +39,20 @@ var aStarTests = []struct {
 	},
 	{
 		name: "small open graph",
-		g:    internal.NewGrid(3, 3, true),
+		g:    testgraphs.NewGrid(3, 3, true),
 
 		s: 0, t: 8,
 	},
 	{
 		name: "large open graph",
-		g:    internal.NewGrid(1000, 1000, true),
+		g:    testgraphs.NewGrid(1000, 1000, true),
 
 		s: 0, t: 999*1000 + 999,
 	},
 	{
 		name: "no path",
 		g: func() graph.Graph {
-			tg := internal.NewGrid(5, 5, true)
+			tg := testgraphs.NewGrid(5, 5, true)
 
 			// Create a complete "wall" across the middle row.
 			tg.Set(2, 0, false)
@@ -70,7 +69,7 @@ var aStarTests = []struct {
 	{
 		name: "partially obstructed",
 		g: func() graph.Graph {
-			tg := internal.NewGrid(10, 10, true)
+			tg := testgraphs.NewGrid(10, 10, true)
 
 			// Create a partial "wall" across the middle
 			// row with a gap at the left-hand end.
@@ -92,7 +91,7 @@ var aStarTests = []struct {
 	{
 		name: "partially obstructed with heuristic",
 		g: func() graph.Graph {
-			tg := internal.NewGrid(10, 10, true)
+			tg := testgraphs.NewGrid(10, 10, true)
 
 			// Create a partial "wall" across the middle
 			// row with a gap at the left-hand end.
diff --git a/graph/path/dynamic/dstarlite_test.go b/graph/path/dynamic/dstarlite_test.go
index 90442d7b..1ceb2b1d 100644
--- a/graph/path/dynamic/dstarlite_test.go
+++ b/graph/path/dynamic/dstarlite_test.go
@@ -15,7 +15,6 @@ import (
 
 	"gonum.org/v1/gonum/graph"
 	"gonum.org/v1/gonum/graph/path"
-	"gonum.org/v1/gonum/graph/path/internal"
 	"gonum.org/v1/gonum/graph/path/internal/testgraphs"
 	"gonum.org/v1/gonum/graph/simple"
 )
@@ -88,12 +87,12 @@ func TestDStarLiteNullHeuristic(t *testing.T) {
 }
 
 var dynamicDStarLiteTests = []struct {
-	g          *internal.Grid
+	g          *testgraphs.Grid
 	radius     float64
 	all        bool
 	diag, unit bool
 	remember   []bool
-	modify     func(*internal.LimitedVisionGrid)
+	modify     func(*testgraphs.LimitedVisionGrid)
 
 	heuristic func(dx, dy float64) float64
 
@@ -105,7 +104,7 @@ var dynamicDStarLiteTests = []struct {
 }{
 	{
 		// This is the example shown in figures 6 and 7 of doi:10.1109/tro.2004.838026.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"...",
 			".*.",
 			".*.",
@@ -139,7 +138,7 @@ var dynamicDStarLiteTests = []struct {
 		// may be taken incorrectly at 90° or correctly at 45° because the
 		// calculated rhs values of 12 and 17 are tied when moving from node
 		// 16, and the grid is small enough to examine by a dump.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			".....",
 			"...*.",
 			"**.*.",
@@ -176,7 +175,7 @@ var dynamicDStarLiteTests = []struct {
 		// with the exception that diagonal edge weights are calculated with the hypot
 		// function instead of a step count and only allowing information to be known
 		// from exploration.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"..................",
 			"..................",
 			"..................",
@@ -239,7 +238,7 @@ var dynamicDStarLiteTests = []struct {
 		// with the exception that diagonal edge weights are calculated with the hypot
 		// function instead of a step count, not closing the exit and only allowing
 		// information to be known from exploration.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"..................",
 			"..................",
 			"..................",
@@ -299,7 +298,7 @@ var dynamicDStarLiteTests = []struct {
 		// with the exception that diagonal edge weights are calculated with the hypot
 		// function instead of a step count, the exit is closed at a distance and
 		// information is allowed to be known from exploration.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"..................",
 			"..................",
 			"..................",
@@ -363,7 +362,7 @@ var dynamicDStarLiteTests = []struct {
 		// This is the example shown in figure 2 of doi:10.1109/tro.2004.838026
 		// with the exception that diagonal edge weights are calculated with the hypot
 		// function instead of a step count.
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"..................",
 			"..................",
 			"..................",
@@ -385,7 +384,7 @@ var dynamicDStarLiteTests = []struct {
 		diag:     true,
 		remember: []bool{true},
 
-		modify: func(l *internal.LimitedVisionGrid) {
+		modify: func(l *testgraphs.LimitedVisionGrid) {
 			all := l.Grid.AllVisible
 			l.Grid.AllVisible = false
 			for _, n := range l.Nodes() {
@@ -459,7 +458,7 @@ var dynamicDStarLiteTests = []struct {
 		weight: 21.242640687119287,
 	},
 	{
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"*..*",
 			"**.*",
 			"**.*",
@@ -487,7 +486,7 @@ var dynamicDStarLiteTests = []struct {
 		weight: 4,
 	},
 	{
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"*..*",
 			"**.*",
 			"**.*",
@@ -514,7 +513,7 @@ var dynamicDStarLiteTests = []struct {
 		weight: math.Sqrt2 + 2,
 	},
 	{
-		g: internal.NewGridFrom(
+		g: testgraphs.NewGridFrom(
 			"...",
 			".*.",
 			".*.",
@@ -555,7 +554,7 @@ var dynamicDStarLiteTests = []struct {
 func TestDStarLiteDynamic(t *testing.T) {
 	for i, test := range dynamicDStarLiteTests {
 		for _, remember := range test.remember {
-			l := &internal.LimitedVisionGrid{
+			l := &testgraphs.LimitedVisionGrid{
 				Grid:         test.g,
 				VisionRadius: test.radius,
 				Location:     test.s,
diff --git a/graph/path/dynamic/dumper_test.go b/graph/path/dynamic/dumper_test.go
index b7fa9392..1ab77210 100644
--- a/graph/path/dynamic/dumper_test.go
+++ b/graph/path/dynamic/dumper_test.go
@@ -11,7 +11,7 @@ import (
 	"sort"
 	"text/tabwriter"
 
-	"gonum.org/v1/gonum/graph/path/internal"
+	"gonum.org/v1/gonum/graph/path/internal/testgraphs"
 	"gonum.org/v1/gonum/graph/simple"
 )
 
@@ -20,7 +20,7 @@ type dumper struct {
 	step int
 
 	dStarLite *DStarLite
-	grid      *internal.LimitedVisionGrid
+	grid      *testgraphs.LimitedVisionGrid
 
 	w io.Writer
 }
diff --git a/graph/path/internal/grid.go b/graph/path/internal/testgraphs/grid.go
similarity index 99%
rename from graph/path/internal/grid.go
rename to graph/path/internal/testgraphs/grid.go
index f062c049..b0d079ad 100644
--- a/graph/path/internal/grid.go
+++ b/graph/path/internal/testgraphs/grid.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package internal
+package testgraphs
 
 import (
 	"errors"
diff --git a/graph/path/internal/grid_test.go b/graph/path/internal/testgraphs/grid_test.go
similarity index 99%
rename from graph/path/internal/grid_test.go
rename to graph/path/internal/testgraphs/grid_test.go
index 7132ffed..4a3fe762 100644
--- a/graph/path/internal/grid_test.go
+++ b/graph/path/internal/testgraphs/grid_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package internal
+package testgraphs
 
 import (
 	"bytes"
diff --git a/graph/path/internal/limited.go b/graph/path/internal/testgraphs/limited.go
similarity index 99%
rename from graph/path/internal/limited.go
rename to graph/path/internal/testgraphs/limited.go
index 6e2cfcdb..347e4df4 100644
--- a/graph/path/internal/limited.go
+++ b/graph/path/internal/testgraphs/limited.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package internal
+package testgraphs
 
 import (
 	"errors"
diff --git a/graph/path/internal/limited_test.go b/graph/path/internal/testgraphs/limited_test.go
similarity index 99%
rename from graph/path/internal/limited_test.go
rename to graph/path/internal/testgraphs/limited_test.go
index 6372471d..0489f5e5 100644
--- a/graph/path/internal/limited_test.go
+++ b/graph/path/internal/testgraphs/limited_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package internal
+package testgraphs
 
 import (
 	"math"