diff --git a/spec/unit/coverage_spec.rb b/spec/unit/coverage_spec.rb
new file mode 100644
index 00000000..05c3ff95
--- /dev/null
+++ b/spec/unit/coverage_spec.rb
@@ -0,0 +1,58 @@
+require "spec_helper"
+
+describe ChefSpec::Coverage::ResourceWrapper do
+  let(:resource) do
+    double("resource", to_s: "template[/etc/foo]", source_line: "/cookbooks/web/recipes/default.rb:12")
+  end
+  subject(:wrapper) { described_class.new(resource) }
+
+  describe "#to_s" do
+    it "delegates to the wrapped resource" do
+      expect(wrapper.to_s).to eq("template[/etc/foo]")
+    end
+  end
+
+  describe "#source_file" do
+    it "extracts the cookbook-relative file from the source line" do
+      expect(wrapper.source_file).to eq("web/recipes/default.rb")
+    end
+
+    it "returns 'Unknown' when the resource has no source line" do
+      allow(resource).to receive(:source_line).and_return(nil)
+      expect(wrapper.source_file).to eq("Unknown")
+    end
+  end
+
+  describe "#source_line" do
+    it "extracts the line number as an integer" do
+      expect(wrapper.source_line).to eq(12)
+    end
+
+    it "returns 'Unknown' when the resource has no source line" do
+      allow(resource).to receive(:source_line).and_return(nil)
+      expect(wrapper.source_line).to eq("Unknown")
+    end
+  end
+
+  describe "#touch! and #touched?" do
+    it "is untouched by default" do
+      expect(wrapper.touched?).to be(false)
+    end
+
+    it "is touched after #touch!" do
+      wrapper.touch!
+      expect(wrapper.touched?).to be(true)
+    end
+  end
+
+  describe "#to_json" do
+    it "serializes the resource details" do
+      require "json"
+      expect(JSON.parse(wrapper.to_json)).to include(
+        "resource" => "template[/etc/foo]",
+        "source_line" => 12,
+        "touched" => false
+      )
+    end
+  end
+end
diff --git a/spec/unit/file_cache_path_proxy_spec.rb b/spec/unit/file_cache_path_proxy_spec.rb
new file mode 100644
index 00000000..eddf017e
--- /dev/null
+++ b/spec/unit/file_cache_path_proxy_spec.rb
@@ -0,0 +1,14 @@
+require "spec_helper"
+
+describe ChefSpec::FileCachePathProxy do
+  subject { described_class.instance }
+
+  it "is a singleton" do
+    expect(described_class.instance).to be(described_class.instance)
+  end
+
+  it "exposes a real, existing temp directory" do
+    expect(subject.file_cache_path).to be_a(String)
+    expect(Dir.exist?(subject.file_cache_path)).to be(true)
+  end
+end
diff --git a/spec/unit/matchers/do_nothing_matcher.rb b/spec/unit/matchers/do_nothing_matcher.rb
deleted file mode 100644
index 34d49ddf..00000000
--- a/spec/unit/matchers/do_nothing_matcher.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-require "spec_helper"
-
-describe ChefSpec::Matchers::DoNothingMatcher do
-  pending
-end
diff --git a/spec/unit/matchers/do_nothing_matcher_spec.rb b/spec/unit/matchers/do_nothing_matcher_spec.rb
new file mode 100644
index 00000000..f2c1f99e
--- /dev/null
+++ b/spec/unit/matchers/do_nothing_matcher_spec.rb
@@ -0,0 +1,54 @@
+require "spec_helper"
+
+describe ChefSpec::Matchers::DoNothingMatcher do
+  subject { described_class.new }
+  let(:resource) { Chef::Resource::Execute.new("run my thing") }
+
+  describe "#matches?" do
+    it "does not match when the resource is nil" do
+      expect(subject.matches?(nil)).to be false
+    end
+
+    it "matches a resource that performed no actions" do
+      allow(resource).to receive(:performed_actions).and_return([])
+      expect(subject.matches?(resource)).to be true
+    end
+
+    it "matches a resource that only performed :nothing" do
+      allow(resource).to receive(:performed_actions).and_return([:nothing])
+      expect(subject.matches?(resource)).to be true
+    end
+
+    it "does not match a resource that performed a real action" do
+      allow(resource).to receive(:performed_actions).and_return([:run])
+      expect(subject.matches?(resource)).to be false
+    end
+  end
+
+  describe "#description" do
+    it "has the right value" do
+      expect(subject.description).to eq("do nothing")
+    end
+  end
+
+  describe "#failure_message" do
+    it "lists the actions that were performed" do
+      allow(resource).to receive(:performed_actions).and_return([:run])
+      subject.matches?(resource)
+      expect(subject.failure_message).to include("to do nothing", ":run")
+    end
+
+    it "explains when the resource was nil" do
+      subject.matches?(nil)
+      expect(subject.failure_message).to include("you gave me was nil")
+    end
+  end
+
+  describe "#failure_message_when_negated" do
+    it "explains that no actions were performed" do
+      allow(resource).to receive(:performed_actions).and_return([])
+      subject.matches?(resource)
+      expect(subject.failure_message_when_negated).to include("to do something")
+    end
+  end
+end
diff --git a/spec/unit/mixins/normalize_spec.rb b/spec/unit/mixins/normalize_spec.rb
new file mode 100644
index 00000000..0c793289
--- /dev/null
+++ b/spec/unit/mixins/normalize_spec.rb
@@ -0,0 +1,30 @@
+require "spec_helper"
+
+describe ChefSpec::Normalize do
+  subject(:normalizer) { Class.new { include ChefSpec::Normalize }.new }
+
+  describe "#resource_name" do
+    it "returns a symbol for a plain string" do
+      expect(normalizer.resource_name("file")).to eq(:file)
+    end
+
+    it "converts dashes to underscores" do
+      expect(normalizer.resource_name("my-resource")).to eq(:my_resource)
+    end
+
+    it "prefers declared_type when present" do
+      thing = double(declared_type: "yum_repository")
+      expect(normalizer.resource_name(thing)).to eq(:yum_repository)
+    end
+
+    it "normalizes dashes in a declared_type" do
+      thing = double(declared_type: "yum-repository")
+      expect(normalizer.resource_name(thing)).to eq(:yum_repository)
+    end
+
+    it "falls back to resource_name when declared_type is nil" do
+      thing = double(declared_type: nil, resource_name: "template")
+      expect(normalizer.resource_name(thing)).to eq(:template)
+    end
+  end
+end
diff --git a/spec/unit/util_spec.rb b/spec/unit/util_spec.rb
new file mode 100644
index 00000000..ce92d93d
--- /dev/null
+++ b/spec/unit/util_spec.rb
@@ -0,0 +1,45 @@
+require "spec_helper"
+
+describe ChefSpec::Util do
+  describe "#underscore" do
+    it "converts CamelCase to snake_case" do
+      expect(described_class.underscore("CamelCase")).to eq("camel_case")
+    end
+
+    it "converts namespaced constants to slash-separated paths" do
+      expect(described_class.underscore("ChefSpec::SoloRunner")).to eq("chef_spec/solo_runner")
+    end
+
+    it "handles runs of capitals (acronyms)" do
+      expect(described_class.underscore("HTTPRequest")).to eq("http_request")
+    end
+
+    it "converts dashes to underscores" do
+      expect(described_class.underscore("my-cookbook")).to eq("my_cookbook")
+    end
+  end
+
+  describe "#camelize" do
+    it "converts snake_case to CamelCase" do
+      expect(described_class.camelize("camel_case")).to eq("CamelCase")
+    end
+
+    it "leaves a single word capitalized" do
+      expect(described_class.camelize("runner")).to eq("Runner")
+    end
+  end
+
+  describe "#truncate" do
+    it "returns the string unchanged when it is within the limit" do
+      expect(described_class.truncate("short")).to eq("short")
+    end
+
+    it "truncates with a trailing ellipsis when over the limit" do
+      expect(described_class.truncate("#{"x" * 40}", length: 10)).to eq("xxxxxxxx...")
+    end
+
+    it "defaults to a length of 30" do
+      expect(described_class.truncate("y" * 40)).to eq("#{"y" * 28}...")
+    end
+  end
+end