2 files changed, 103 insertions, 0 deletions
diff --git a/Library/Homebrew/test/hardware_spec.rb b/Library/Homebrew/test/hardware_spec.rb
index c5f8daf4e..de8d77e68 100644
--- a/Library/Homebrew/test/hardware_spec.rb
+++ b/Library/Homebrew/test/hardware_spec.rb
@@ -36,5 +36,52 @@ module Hardware
         ).to include(described_class.family)
       end
     end
+
+    describe "::can_run?" do
+      it "reports that Intel machines can run Intel executables" do
+        allow(Hardware::CPU).to receive(:type).and_return :intel
+        allow(Hardware::CPU).to receive(:bits).and_return 64
+        expect(Hardware::CPU.can_run?(:i386)).to be true
+        expect(Hardware::CPU.can_run?(:x86_64)).to be true
+      end
+
+      it "reports that PowerPC machines can run PowerPC executables" do
+        allow(Hardware::CPU).to receive(:type).and_return :ppc
+        allow(Hardware::CPU).to receive(:bits).and_return 64
+        expect(Hardware::CPU.can_run?(:ppc)).to be true
+        expect(Hardware::CPU.can_run?(:ppc64)).to be true
+      end
+
+      it "reports that 32-bit Intel machines can't run x86_64 executables" do
+        allow(Hardware::CPU).to receive(:type).and_return :intel
+        allow(Hardware::CPU).to receive(:bits).and_return 32
+        expect(Hardware::CPU.can_run?(:x86_64)).to be false
+      end
+
+      it "reports that 32-bit PowerPC machines can't run ppc64 executables" do
+        allow(Hardware::CPU).to receive(:type).and_return :ppc
+        allow(Hardware::CPU).to receive(:bits).and_return 32
+        expect(Hardware::CPU.can_run?(:ppc64)).to be false
+      end
+
+      it "identifies that Intel and PowerPC machines can't run each others' executables" do
+        allow(Hardware::CPU).to receive(:type).and_return :ppc
+        expect(Hardware::CPU.can_run?(:i386)).to be false
+        expect(Hardware::CPU.can_run?(:x86_64)).to be false
+
+        allow(Hardware::CPU).to receive(:type).and_return :intel
+        expect(Hardware::CPU.can_run?(:ppc)).to be false
+        expect(Hardware::CPU.can_run?(:ppc64)).to be false
+      end
+
+      it "returns false for unknown CPU types" do
+        allow(Hardware::CPU).to receive(:type).and_return :dunno
+        expect(Hardware::CPU.can_run?(:i386)).to be false
+      end
+
+      it "returns false for unknown arches" do
+        expect(Hardware::CPU.can_run?(:blah)).to be false
+      end
+    end
   end
 end
diff --git a/Library/Homebrew/test/os/mac/hardware_spec.rb b/Library/Homebrew/test/os/mac/hardware_spec.rb
new file mode 100644
index 000000000..fa577ba7d
--- /dev/null
+++ b/Library/Homebrew/test/os/mac/hardware_spec.rb
@@ -0,0 +1,56 @@
+require "hardware"
+require "extend/os/mac/hardware/cpu"
+
+describe Hardware::CPU do
+  describe "::can_run?" do
+    it "reports that Intel Macs can run Intel executables" do
+      allow(Hardware::CPU).to receive(:type).and_return :intel
+      allow(Hardware::CPU).to receive(:bits).and_return 64
+      expect(Hardware::CPU.can_run?(:i386)).to be true
+      expect(Hardware::CPU.can_run?(:x86_64)).to be true
+    end
+
+    it "reports that PowerPC Macs can run PowerPC executables" do
+      allow(Hardware::CPU).to receive(:type).and_return :ppc
+      allow(Hardware::CPU).to receive(:bits).and_return 64
+      expect(Hardware::CPU.can_run?(:ppc)).to be true
+      expect(Hardware::CPU.can_run?(:ppc64)).to be true
+    end
+
+    it "reports that 32-bit Intel Macs can't run x86_64 executables" do
+      allow(Hardware::CPU).to receive(:type).and_return :intel
+      allow(Hardware::CPU).to receive(:bits).and_return 32
+      expect(Hardware::CPU.can_run?(:x86_64)).to be false
+    end
+
+    it "reports that 32-bit PowerPC Macs can't run ppc64 executables" do
+      allow(Hardware::CPU).to receive(:type).and_return :ppc
+      allow(Hardware::CPU).to receive(:bits).and_return 32
+      expect(Hardware::CPU.can_run?(:ppc64)).to be false
+    end
+
+    it "reports that Intel Macs can only run 32-bit PowerPC executables on 10.6 and older" do
+      allow(Hardware::CPU).to receive(:type).and_return :intel
+      allow(OS::Mac).to receive(:version).and_return OS::Mac::Version.new "10.6"
+      expect(Hardware::CPU.can_run?(:ppc)).to be true
+
+      allow(OS::Mac).to receive(:version).and_return OS::Mac::Version.new "10.7"
+      expect(Hardware::CPU.can_run?(:ppc)).to be false
+    end
+
+    it "reports that PowerPC Macs can't run Intel executables" do
+      allow(Hardware::CPU).to receive(:type).and_return :ppc
+      expect(Hardware::CPU.can_run?(:i386)).to be false
+      expect(Hardware::CPU.can_run?(:x86_64)).to be false
+    end
+
+    it "returns false for unknown CPU types" do
+      allow(Hardware::CPU).to receive(:type).and_return :dunno
+      expect(Hardware::CPU.can_run?(:i386)).to be false
+    end
+
+    it "returns false for unknown arches" do
+      expect(Hardware::CPU.can_run?(:blah)).to be false
+    end
+  end
+end