Fix invalid tests

Because of #482, `nodes` are not modified thus we must use the return
value in step-by-step tests

Author: lambdalisue

test/fern/internal/node.vimspec

@@ -395,7 +395,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -410,7 +410,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -426,7 +426,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -442,7 +442,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma', 'UNKNOWN'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma', 'UNKNOWN'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -492,7 +492,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -507,7 +507,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -523,7 +523,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)
@@ -539,7 +539,7 @@ Describe fern#internal#node
             \])
 
       let [r, e] = Promise.wait(
-            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma', 'UNKNOWN'], nodes, provider, Comparator, token),
+            \ fern#internal#node#reveal(['deep', 'alpha', 'beta', 'gamma', 'UNKNOWN'], r, provider, Comparator, token),
             \ { 'timeout': TIMEOUT },
             \)
       Assert Equals(e, v:null)