routing: use simple errors for path finding

routing/pathfind_test.go

@@ -1269,7 +1269,7 @@ func TestPathNotAvailable(t *testing.T) {
 		noRestrictions, testPathFindingConfig,
 		sourceNode.PubKeyBytes, unknownNode, 100,
 	)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("path shouldn't have been found: %v", err)
 	}
 }
@@ -1306,7 +1306,7 @@ func TestPathInsufficientCapacity(t *testing.T) {
 		noRestrictions, testPathFindingConfig,
 		sourceNode.PubKeyBytes, target, payAmt,
 	)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("graph shouldn't be able to support payment: %v", err)
 	}
 }
@@ -1339,7 +1339,7 @@ func TestRouteFailMinHTLC(t *testing.T) {
 		noRestrictions, testPathFindingConfig,
 		sourceNode.PubKeyBytes, target, payAmt,
 	)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("graph shouldn't be able to support payment: %v", err)
 	}
 }
@@ -1403,7 +1403,7 @@ func TestRouteFailMaxHTLC(t *testing.T) {
 	// We'll now attempt to route through that edge with a payment above
 	// 100k msat, which should fail.
 	_, err = ctx.findPath(target, payAmt)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("graph shouldn't be able to support payment: %v", err)
 	}
 }
@@ -1491,7 +1491,7 @@ func TestRouteFailDisabledEdge(t *testing.T) {
 		noRestrictions, testPathFindingConfig,
 		sourceNode.PubKeyBytes, target, payAmt,
 	)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("graph shouldn't be able to support payment: %v", err)
 	}
 }
@@ -1549,7 +1549,7 @@ func TestPathSourceEdgesBandwidth(t *testing.T) {
 		noRestrictions, testPathFindingConfig,
 		sourceNode.PubKeyBytes, target, payAmt,
 	)
-	if !IsError(err, ErrNoPathFound) {
+	if err != errNoPathFound {
 		t.Fatalf("graph shouldn't be able to support payment: %v", err)
 	}
 
@@ -1971,7 +1971,7 @@ func testCltvLimit(t *testing.T, limit uint32, expectedChannel uint64) {
 	path, err := ctx.findPath(target, paymentAmt)
 	if expectedChannel == 0 {
 		// Finish test if we expect no route.
-		if IsError(err, ErrNoPathFound) {
+		if err == errNoPathFound {
 			return
 		}
 		t.Fatal("expected no path to be found")
@@ -2137,7 +2137,7 @@ func testProbabilityRouting(t *testing.T, p10, p11, p20, minProbability float64,
 
 	path, err := ctx.findPath(target, paymentAmt)
 	if expectedChan == 0 {
-		if err == nil || !IsError(err, ErrNoPathFound) {
+		if err != errNoPathFound {
 			t.Fatalf("expected no path found, but got %v", err)
 		}
 		return