test(library): add test for reading contexts without optional fields

Author: krzema12

github-workflows-kt/src/test/kotlin/io/github/typesafegithub/workflows/yaml/ContextMappingTest.kt

@@ -10,7 +10,7 @@ class ContextMappingTest :
     FunSpec({
         test("successfully load all supported contexts with all supported fields") {
             // Given
-            val testGithubContextJson = javaClass.getResource("/contexts/github.json")!!.readText()
+            val testGithubContextJson = javaClass.getResource("/contexts/github-all-fields.json")!!.readText()
 
             // When
             val contexts =
@@ -36,4 +36,29 @@ class ContextMappingTest :
                         ),
                 )
         }
+
+        test("successfully load all supported contexts with only required fields") {
+            // Given
+            val testGithubContextJson = javaClass.getResource("/contexts/github-required-fields.json")!!.readText()
+
+            // When
+            val contexts =
+                loadContextsFromEnvVars(
+                    getenv = mapOf(
+                        "GHWKT_GITHUB_CONTEXT_JSON" to testGithubContextJson,
+                    )::get,
+                )
+
+            // Then
+            contexts shouldBe
+                Contexts(
+                    github =
+                        GithubContext(
+                            repository = "some-owner/some-repo",
+                            sha = "db76dd0f1149901e1cdf60ec98d568b32fa7eb71",
+                            event = GithubContextEvent(),
+                            event_name = "push",
+                        ),
+                )
+        }
     })

github-workflows-kt/src/test/resources/contexts/github.json renamed to github-workflows-kt/src/test/resources/contexts/github-all-fields.json

@@ -0,0 +1,6 @@
+{
+  "repository": "some-owner/some-repo",
+  "sha": "db76dd0f1149901e1cdf60ec98d568b32fa7eb71",
+  "event": {},
+  "event_name": "push"
+}