expect --to-equal tests

plugins/fish-spec/spec/expect.to_equal.spec.fish

+import plugins/fish-spec
+
+function describe_to_equal -d 'expect --to-equal'
+  function before_each
+    set -e result
+  end
+
+  function it_returns_0_when_compared_values_are_the_same
+    set -l equal "equal"
+
+    echo (expect $equal --to-equal $equal; set result $status) >/dev/null
+    expect $result --to-equal 0
+  end
+
+  function it_returns_1_when_compared_values_are_different
+    set -l equal "equal"
+
+    echo (expect $equal --to-equal 'different'; set result $status) >/dev/null
+    expect $result --to-equal 1
+  end
+
+  function it_returns_0_when_array_elements_are_in_the_same_order
+    set -l array 1 2
+
+    echo (expect $array --to-equal 1 2; set result $status) >/dev/null
+    expect $result --to-equal 0
+  end
+
+  function it_returns_1_when_array_elements_are_in_different_order
+    set -l array 1 2
+
+    echo (expect $array --to-equal 2 1; set result $status) >/dev/null
+    expect $result --to-equal 1
+  end
+end
+
+spec.run $argv