Add functional tests for availability of lib dependencies (#29)

Ensure that the test program actually uses the tested libraries, because otherwise they would not be linked

Author: straight-shoota

.github/test/crystal-libs_spec.cr

@@ -0,0 +1,45 @@
+require "spec"
+require "yaml"
+
+it "yaml" do
+  any = YAML::Any.new({
+    YAML::Any.new("foo") => YAML::Any.new(12_i64)
+  })
+  YAML.parse(any.to_yaml).should eq any
+end
+
+require "xml"
+
+it "xml" do
+  string = XML.build do |xml|
+    xml.element("person", id: 1) do
+      xml.element("firstname") { xml.text "Jane" }
+      xml.element("lastname") { xml.text "Doe" }
+    end
+  end
+
+  document = XML.parse(string)
+  person = document.first_element_child.should_not be_nil
+  person["id"].should eq "1"
+
+  props = {} of String => String
+  person.children.select(&.element?).each do |child|
+    props[child.name] = child.content
+  end
+  props.should eq({
+    "firstname" => "Jane",
+    "lastname" => "Doe",
+  })
+end
+
+require "big"
+
+it "big" do
+  1.to_big_d.to_i.should eq 1
+end
+
+require "openssl/sha1"
+
+it "openssl" do
+  OpenSSL::SHA1.hash("foobarbaz").should eq StaticArray[95, 85, 19, 248, 130, 47, 219, 229, 20, 90, 243, 59, 100, 216, 217, 112, 220, 249, 92, 110]
+end

.github/workflows/main.yml

@@ -57,8 +57,7 @@ jobs:
           crystal --version | grep -E "${v}\\b"
         if: ${{ contains(matrix.config.crystal, '.') }}
       - run: |
-          crystal eval 'require "yaml"; require "xml"; require "big"; require "openssl"'
-
+          crystal spec .github/test/crystal-libs_spec.cr
       - run: |
           shards --version
         if: ${{ !contains('false', matrix.config.shards) }}

.github/workflows/release.yml

@@ -57,8 +57,7 @@ jobs:
           crystal --version | grep -E "${v}\\b"
         if: ${{ contains(matrix.config.crystal, '.') }}
       - run: |
-          crystal eval 'require "yaml"; require "xml"; require "big"; require "openssl"'
-
+          crystal spec .github/test/crystal-libs_spec.cr
       - run: |
           shards --version
         if: ${{ !contains('false', matrix.config.shards) }}