Add custom rspec matcher for coordinates

spec/mars_rovers_spec.rb

@@ -4,13 +4,13 @@
   it 'has a starting position of (2, 3) and a facing direction of N]' do
     mars_rover = MarsRover.new(Point.new(2,3, 'N'))
 
-    expect(mars_rover.point).to eq Point.new(2, 3,'N')
+    expect(mars_rover.point).to be_located_at Point.new(2, 3,'N')
   end
 
   it 'has a starting position of (1,2) and a facing direction of S' do
     mars_rover = MarsRover.new(Point.new(1,2, 'S'))
 
-    expect(mars_rover.point).to eq Point.new(1, 2,'S')
+    expect(mars_rover.point).to be_located_at Point.new(1, 2,'S')
   end
 
   it 'does not process unrecognised commands (e.g. command y)'
@@ -20,78 +20,91 @@
 
     mars_rover.execute_commands(%w[f])
 
-    expect(mars_rover.point).to eq Point.new(0, 1,'N')
+    expect(mars_rover.point).to be_located_at Point.new(0, 1,'N')
   end
 
   it 'moves forwards when facing south' do
     mars_rover = MarsRover.new(Point.new(0,1, 'S'))
 
     mars_rover.execute_commands(%w[f])
 
-    expect(mars_rover.point).to eq Point.new(0, 0,'S')
+    expect(mars_rover.point).to be_located_at Point.new(0, 0,'S')
   end
 
   it 'moves forwards when facing west' do
     mars_rover = MarsRover.new( Point.new(0,0, 'W'))
 
     mars_rover.execute_commands(%w[f])
 
-    expect(mars_rover.point).to eq Point.new(-1, 0,'W')
+    expect(mars_rover.point).to be_located_at Point.new(-1, 0,'W')
   end
 
   it 'moves forwards when facing east' do
     mars_rover = MarsRover.new(Point.new(0,0, 'E'))
 
     mars_rover.execute_commands(%w[f])
 
-    expect(mars_rover.point).to eq Point.new(1, 0,'E')
+    expect(mars_rover.point).to be_located_at Point.new(1, 0,'E')
   end
 
   it 'moves backwards when facing north' do
     mars_rover = MarsRover.new(Point.new(0,1, 'N'))
 
     mars_rover.execute_commands(%w[b])
 
-    expect(mars_rover.point).to eq Point.new(0, 0,'N')
+    expect(mars_rover.point).to be_located_at Point.new(0, 0,'N')
   end
 
   it 'moves backwards when facing south' do
     mars_rover = MarsRover.new(Point.new(0,0, 'S'))
 
     mars_rover.execute_commands(%w[b])
 
-    expect(mars_rover.point).to eq Point.new(0, 1,'S')
+    expect(mars_rover.point).to be_located_at Point.new(0, 1,'S')
   end
 
   it 'moves left when facing North' do
     mars_rover = MarsRover.new(Point.new(0,0, 'N'))
 
     mars_rover.execute_commands(%w[l])
 
-    expect(mars_rover.point).to eq Point.new(-1, 0,'N')
+    expect(mars_rover.point).to be_located_at Point.new(-1, 0,'N')
   end
 
   it 'moves left when facing East' do
     mars_rover = MarsRover.new(Point.new(0,0, 'E'))
 
     mars_rover.execute_commands(%w[l])
 
-    expect(mars_rover.point).to eq Point.new(0, 1,'E')
+    expect(mars_rover.point).to be_located_at Point.new(0, 1,'E')
   end
 
   it 'moves right when facing South' do
     mars_rover = MarsRover.new(Point.new(0,0, 'S'))
 
     mars_rover.execute_commands(%w[r])
 
-    expect(mars_rover.point).to eq Point.new(-1, 0,'S')
+    expect(mars_rover.point).to be_located_at Point.new(-1, 0,'S')
   end
 
   it 'moves right when facing West' do
     mars_rover = MarsRover.new(Point.new(0,0, 'W'))
 
     mars_rover.execute_commands(%w[r])
 
-    expect(mars_rover.point).to eq Point.new(0, 1,'W')
+    expect(mars_rover.point).to be_located_at Point.new(0, 1,'W')
+  end
+
+  RSpec::Matchers.define :be_located_at do |expected_point|
+    match do |actual_point|
+      actual_point == expected_point
+    end
+    failure_message do |actual_point|
+      "expected that #{actual_point} would have the same coordinates as #{expected_point}. Coordinates:\n
+      ACTUAL | EXPECTED\n
+        X: #{actual_point.x} | #{expected_point.x}\n
+        Y: #{actual_point.y} | #{expected_point.y}\n
+        D: #{actual_point.direction} | #{expected_point.direction}\n"
+    end
   end
 end