Add nocov surrounds to fixtures, add notes to some tests.

There are some tests that need some serious attention before moving too
far forward from here.

spec/lib/shanty/discoverer_spec.rb

@@ -5,12 +5,12 @@
 # All classes referenced belong to the shanty project
 module Shanty
   RSpec.describe Shanty::Discoverer do
-    let(:discoverers) do
-      Discoverer.discoverers
-    end
+    let(:discoverers) { Discoverer.discoverers }
 
-    describe '#discoervers' do
+    describe '#discoverers' do
       it 'finds all discoverers' do
+        # FIXME: This is not a good test. This could break any time anything requires in another discoverer.
+        # We should instead inspect that it contains a discoverer that we create and require within this test.
         expect(discoverers).to contain_exactly(Shanty::ShantyfileDiscoverer)
         expect(discoverers.size).to be == 1
       end

spec/lib/shanty/graph_spec.rb

@@ -16,7 +16,12 @@ module Shanty
         File.join(root, 'examples', 'test-static-project')
       ]
     end
+
+    # We don't want the creation of the project templates to affect coverage here.
+    # :nocov:
     let(:project_templates) { project_paths.map { |project_path| ProjectTemplate.new(root, project_path) } }
+    # :nocov:
+
     let(:graph) { Graph.new(project_templates) }
 
     describe 'enumerable methods' do

spec/lib/shanty/shanty_file_discoverer_spec.rb

@@ -4,12 +4,7 @@
 
 # All classes referenced belong to the shanty project
 module Shanty
-  RSpec.describe Shanty::ShantyfileDiscoverer do
-    let(:project_templates) do
-      Dir.chdir('examples') do
-        ShantyfileDiscoverer.new.discover
-      end
-    end
+  RSpec.describe(Shanty::ShantyfileDiscoverer) do
     let(:project1) { 'test-static-project' }
     let(:project2) { 'test-static-project-2' }
     let(:project3) { 'test-static-project-3' }
@@ -22,6 +17,11 @@ module Shanty
         File.join(Dir.pwd, 'examples', project2, project3)
       ]
     end
+    let(:project_templates) do
+      Dir.chdir('examples') do
+        ShantyfileDiscoverer.new.discover
+      end
+    end
 
     describe '#discovered' do
       it 'finds example projects' do