test: merged and refactored make.R tests

tests/testthat/_snaps/make.md

@@ -1,3 +1,46 @@
+# error messages are proper
+
+    Code
+      make_()
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to make_, nothing given
+    Code
+      make_(1:10)
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to make_, nothing given
+    Code
+      graph_()
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to graph_, nothing given
+    Code
+      graph_(1:10)
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to graph_, nothing given
+    Code
+      graph_(directed_graph(), directed_graph())
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to graph_, multiple constructors given
+    Code
+      sample_()
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to sample_, nothing given
+    Code
+      sample_(1:10)
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to sample_, nothing given
+    Code
+      sample_(directed_graph(), directed_graph())
+    Condition
+      Error in `.extract_constructor_and_modifiers()`:
+      ! Don't know how to sample_, multiple constructors given
+
 # graph_from_literal() and simple undirected graphs
 
     Code
@@ -106,3 +149,11 @@
       + edges (vertex names):
       [1] 1--1 1--2 1--2
 
+# make_empty_graph gives an error for invalid arguments
+
+    Code
+      make_empty_graph(NULL)
+    Condition
+      Error in `make_empty_graph()`:
+      ! At rinterface_extra.c:78 : Expecting a scalar integer but received a vector of length 0. Invalid value
+