Extract linux spec cases & add hash support to default #uses_from_macos

Library/Homebrew/extend/os/mac/software_spec.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class SoftwareSpec
+  undef uses_from_macos
+
   def uses_from_macos(deps, **args)
     if deps.is_a?(Hash)
       args = deps

Library/Homebrew/software_spec.rb

@@ -170,8 +170,10 @@ class SoftwareSpec
     add_dep_option(dep) if dep
   end
 
-  def uses_from_macos(spec, **_args)
-    depends_on(spec)
+  def uses_from_macos(deps, **_args)
+    deps.is_a?(Hash) && deps = Hash[*deps.shift]
+
+    depends_on(deps)
   end
 
   def deps

Library/Homebrew/test/os/linux/software_spec_spec.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require "software_spec"
+
+describe SoftwareSpec do
+  subject(:spec) { described_class.new }
+
+  describe "#uses_from_macos" do
+    before do
+      allow(OS).to receive(:linux?).and_return(true)
+    end
+
+    it "allows specifying dependencies" do
+      spec.uses_from_macos("foo")
+
+      expect(spec.deps.first.name).to eq("foo")
+    end
+
+    it "works with tags" do
+      spec.uses_from_macos("foo" => :head, :after => :mojave)
+
+      expect(spec.deps.first.name).to eq("foo")
+      expect(spec.deps.first.tags).to include(:head)
+    end
+
+    it "ignores OS version specifications" do
+      spec.uses_from_macos("foo", after: :mojave)
+      spec.uses_from_macos("bar" => :head, :after => :mojave)
+
+      expect(spec.deps.first.name).to eq("foo")
+      expect(spec.deps.last.name).to eq("bar")
+      expect(spec.deps.last.tags).to include(:head)
+    end
+  end
+end

Library/Homebrew/test/software_spec_spec.rb

@@ -138,18 +138,6 @@ describe SoftwareSpec do
     expect(subject.options.first.description).to eq("blah")
   end
 
-  describe "#uses_from_macos" do
-    it "allows specifying dependencies" do
-      subject.uses_from_macos("foo")
-      expect(subject.deps.first.name).to eq("foo")
-    end
-
-    it "ignores OS version specifications" do
-      subject.uses_from_macos("foo", after: :mojave)
-      expect(subject.deps.first.name).to eq("foo")
-    end
-  end
-
   describe "#patch" do
     it "adds a patch" do
       subject.patch(:p1, :DATA)