1 files changed, 54 insertions, 0 deletions
diff --git a/spec/lib/rake/compiler_config_spec.rb b/spec/lib/rake/compiler_config_spec.rb
new file mode 100644
index 0000000..22b1f7f
--- /dev/null
+++ b/spec/lib/rake/compiler_config_spec.rb
@@ -0,0 +1,54 @@
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper')
+
+require 'rake/extensiontask'
+require 'rbconfig'
+require 'tempfile'
+
+describe Rake::CompilerConfig do
+  def config_file(contents)
+    Tempfile.new.tap do |tf|
+      tf.write(contents)
+      tf.close
+    end
+  end
+
+  it "returns the matching config for exact platform match" do
+    cc = Rake::CompilerConfig.new(config_file(<<~CONFIG))
+      ---
+      rbconfig-x86_64-linux-3.0.0: "/path/to/aaa/rbconfig.rb"
+      rbconfig-x86_64-darwin-3.1.0: "/path/to/bbb/rbconfig.rb"
+      rbconfig-x86_64-linux-3.1.0: "/path/to/ccc/rbconfig.rb"
+    CONFIG
+
+    expect(cc.find("3.0.0", "x86_64-linux")).to eq("/path/to/aaa/rbconfig.rb")
+    expect(cc.find("3.1.0", "x86_64-darwin")).to eq("/path/to/bbb/rbconfig.rb")
+    expect(cc.find("3.1.0", "x86_64-linux")).to eq("/path/to/ccc/rbconfig.rb")
+
+    expect(cc.find("2.7.0", "x86_64-linux")).to be_nil
+    expect(cc.find("3.1.0", "arm64-linux")).to be_nil
+  end
+
+  it "returns the matching config for inexact platform match" do
+    cc = Rake::CompilerConfig.new(config_file(<<~CONFIG))
+      ---
+      rbconfig-x86_64-linux-gnu-3.0.0: "/path/to/aaa/rbconfig.rb"
+      rbconfig-x86_64-linux-musl-3.1.0: "/path/to/bbb/rbconfig.rb"
+    CONFIG
+
+    expect(cc.find("3.0.0", "x86_64-linux")).to eq("/path/to/aaa/rbconfig.rb")
+    expect(cc.find("3.1.0", "x86_64-linux")).to eq("/path/to/bbb/rbconfig.rb")
+  end
+
+  it "does not match the other way around" do
+    if Gem::Version.new(Gem::VERSION) < Gem::Version.new("3.3.21")
+      skip "rubygems 3.3.21+ only"
+    end
+
+    cc = Rake::CompilerConfig.new(config_file(<<~CONFIG))
+      ---
+      rbconfig-x86_64-linux-3.1.0: "/path/to/bbb/rbconfig.rb"
+    CONFIG
+
+    expect(cc.find("3.1.0", "x86_64-linux-musl")).to be_nil
+  end
+end