feat: add basic support for spec

spec/spec_helper.cr

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+require "spec"

spec/utils/breadcrumbs_spec.cr

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+require "../spec_helper"
+require "../../src/utils/breadcrumbs"
+
+describe GX::Utils::BreadCrumbs do
+  context "Initialization" do
+    it "can initialize from array" do
+      # empty string
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_a.should be_empty
+
+      # simple string
+      b2 = GX::Utils::BreadCrumbs.new(["test1"])
+      b2.to_a.should eq(["test1"])
+
+      # array
+      b3 = GX::Utils::BreadCrumbs.new(["test1", "test2"])
+      b3.to_a.should eq(["test1", "test2"])
+    end
+  end
+
+  context "Functioning" do
+    it "can add values" do
+      # empty string
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_a.should be_empty
+
+      # simple string
+      b2 = b1 + "test1"
+      b2.to_a.should eq(["test1"])
+
+      b3 = b2 + "test2"
+      b3.to_a.should eq(["test1", "test2"])
+    end
+
+    it "can become a string" do
+      b1 = GX::Utils::BreadCrumbs.new([] of String)
+      b1.to_s.should eq("")
+
+      b2 = b1 + "test1"
+      b2.to_a.should eq("test1")
+
+      b3 = b2 + "test2"
+      b3.to_a.should eq("test1 test2")
+    end
+  end
+end