Test with multiple Rails versions on CI

.github/workflows/build.yml

@@ -3,11 +3,29 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - ruby: 3.1
+          gemfile: Gemfile
+        - ruby: "3.0"
+          gemfile: gemfiles/rails61.gemfile
+        - ruby: 2.7
+          gemfile: gemfiles/rails60.gemfile
+        - ruby: 2.6
+          gemfile: gemfiles/rails52.gemfile
+        - ruby: 2.5
+          gemfile: gemfiles/rails51.gemfile
+        - ruby: 2.4
+          gemfile: gemfiles/rails50.gemfile
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.1
+        ruby-version: ${{ matrix.ruby }}
         bundler-cache: true
     - uses: ankane/setup-postgres@v1
       with:

.gitignore

@@ -14,3 +14,4 @@
 *.log
 *.sqlite
 /test/internal/tmp
+*.lock

gemfiles/rails50.gemfile

@@ -0,0 +1,9 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rake"
+gem "minitest", ">= 5"
+gem "combustion"
+gem "rails", "~> 5.0.0"
+gem "pg"

gemfiles/rails51.gemfile

@@ -0,0 +1,9 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rake"
+gem "minitest", ">= 5"
+gem "combustion"
+gem "rails", "~> 5.1.0"
+gem "pg"

gemfiles/rails52.gemfile

@@ -0,0 +1,9 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rake"
+gem "minitest", ">= 5"
+gem "combustion"
+gem "rails", "~> 5.2.0"
+gem "pg"

gemfiles/rails60.gemfile

@@ -0,0 +1,9 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rake"
+gem "minitest", ">= 5"
+gem "combustion"
+gem "rails", "~> 6.0.0"
+gem "pg"

gemfiles/rails61.gemfile

@@ -0,0 +1,9 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rake"
+gem "minitest", ">= 5"
+gem "combustion"
+gem "rails", "~> 6.1.0"
+gem "pg"

test/charts_test.rb

@@ -12,12 +12,12 @@ def test_line_chart_format2
   end
 
   def test_column_chart_format1
-    run_query "SELECT 'Label', 1"
+    run_query "SELECT 'Label' AS label, 1"
     assert_match "ColumnChart", response.body
   end
 
   def test_column_chart_format2
-    run_query "SELECT 'Label', 'Group', 1"
+    run_query "SELECT 'Label' AS label, 'Group' AS group, 1"
     assert_match "ColumnChart", response.body
     assert_match %{"name":"Group"}, response.body
   end

test/checks_test.rb

@@ -50,6 +50,8 @@ def test_error
   end
 
   def test_emails
+    skip "No assert_emails" if Rails::VERSION::MAJOR < 6
+
     query = create_query
     check = create_check(query: query, check_type: "bad_data", emails: "hi@example.org,hi2@example.org")
 

test/queries_test.rb

@@ -107,7 +107,7 @@ def test_images_default
   def test_images
     Blazer.stub(:images, true) do
       run_query("SELECT 'http://localhost:3000/image.png'")
-      assert_match %{<img referrerpolicy="no-referrer" src="http://localhost:3000/image.png" />}, response.body
+      assert_match %{<img referrerpolicy="no-referrer" src="http://localhost:3000/image.png" }, response.body
     end
   end
 end