Create check yaml loading tests

test/catalog_test.exs

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+defmodule Wanda.CatalogTest do
+  use ExUnit.Case
+
+  alias Wanda.Catalog
+
+  alias Wanda.Catalog.{
+    Check,
+    Condition,
+    Expectation,
+    Fact,
+    Value
+  }
+
+  describe "checks catalog" do
+    test "should load a check from a yaml file properly" do
+      assert %Check{
+               id: "expect_check",
+               name: "Test check",
+               severity: :critical,
+               facts: [
+                 %Fact{
+                   name: "corosync_token_timeout",
+                   gatherer: "corosync",
+                   argument: "totem.token"
+                 }
+               ],
+               values: [],
+               expectations: [
+                 %Expectation{
+                   name: "timeout",
+                   type: :expect,
+                   expression: "corosync_token_timeout == 30000"
+                 }
+               ]
+             } = Catalog.get_check("expect_check")
+    end
+
+    test "should load a critical as default severity" do
+      assert %Check{severity: :critical} = Catalog.get_check("expect_same_check")
+    end
+
+    test "should load a warning severity" do
+      assert %Check{severity: :warning} = Catalog.get_check("warning_severity_check")
+    end
+
+    test "should load checks with values" do
+      assert %Check{
+               values: [
+                 %Value{
+                   conditions: [
+                     %Condition{expression: "some_expression", value: 10},
+                     %Condition{expression: "some_other_expression", value: 15}
+                   ],
+                   default: 5,
+                   name: "expected_value"
+                 },
+                 %Value{
+                   conditions: [
+                     %Condition{expression: "some_third_expression", value: 5}
+                   ],
+                   default: 10,
+                   name: "expected_higher_value"
+                 }
+               ]
+             } = Catalog.get_check("with_values_check")
+    end
+  end
+end

test/fixtures/catalog/with_values_check.yaml

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+id: with_values
+name: Test check
+group: Test
+description: |
+  Just a check
+remediation: |
+  ## Remediation
+  Remediation text
+facts:
+  - name: jedi
+    gatherer: wandalorian
+    argument: -o
+values:
+  - name: expected_value
+    default: 5
+    conditions:
+      - value: 10
+        when: some_expression
+      - value: 15
+        when: some_other_expression
+  - name: expected_higher_value
+    default: 10
+    conditions:
+      - value: 5
+        when: some_third_expression
+expectations:
+  - name: some_expectation
+    expect: jedi == values.expected_value
+  - name: some_other_expectation
+    expect: jedi > values.expected_higher_value