diff --git a/spec/rspec/expectations/be_within_matcher_spec.cr b/spec/rspec/expectations/be_within_matcher_spec.cr
new file mode 100644
index 0000000..0307d1b
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+++ b/spec/rspec/expectations/be_within_matcher_spec.cr
@@ -0,0 +1,25 @@
+require "../../spec_helper"
+
+# Examples taken from:
+# https://relishapp.com/rspec/rspec-expectations/v/3-8/docs/built-in-matchers/be-within-matcher
+# and modified to fit Spectator and Crystal.
+Spectator.describe "`be_within` matcher" do
+  context "basic usage" do
+    describe 27.5 do
+      it { is_expected.to be_within(0.5).of(27.9) }
+      it { is_expected.to be_within(0.5).of(28.0) }
+      it { is_expected.to be_within(0.5).of(27.1) }
+      it { is_expected.to be_within(0.5).of(27.0) }
+
+      it { is_expected.not_to be_within(0.5).of(28.1) }
+      it { is_expected.not_to be_within(0.5).of(26.9) }
+
+      # deliberate failures
+      # TODO: Add support for expected failures.
+      xit { is_expected.not_to be_within(0.5).of(28) }
+      xit { is_expected.not_to be_within(0.5).of(27) }
+      xit { is_expected.to be_within(0.5).of(28.1) }
+      xit { is_expected.to be_within(0.5).of(26.9) }
+    end
+  end
+end