add config test

pipeline/relation_embedder/relation_embedder/src/test/scala/weco/pipeline/relation_embedder/lib/ConfigurationTest.scala

@@ -0,0 +1,86 @@
+package weco.pipeline.relation_embedder.lib
+
+import org.scalatest.funspec.AnyFunSpec
+import org.scalatest.matchers.should.Matchers
+import weco.pipeline.relation_embedder.helpers.ConfigurationTestHelpers
+
+class ConfigurationTest
+    extends AnyFunSpec
+    with ConfigurationTestHelpers
+    with Matchers {
+
+  it("loads the base configuration") {
+    val baseConfig =
+      """
+        |config1 = "value"
+        |""".asConfig
+
+    withLayeredConfig(
+      baseConfig = baseConfig
+    ) {
+      config =>
+        config shouldBe TestAppConfiguration(
+          config1 = Some("value")
+        )
+    }
+  }
+
+  it("overrides the base configuration with the application configuration") {
+    withLayeredConfig(
+      baseConfig = """
+          |config1 = "valueFromBaseForConfig1"
+          |config2 = "valueFromBaseForConfig2"
+          |""".asConfig,
+      applicationConfig = """
+          |config1 = "valueFromApplicationForConfig1"
+          |""".asConfig
+    ) {
+      config =>
+        config shouldBe TestAppConfiguration(
+          config1 = Some("valueFromApplicationForConfig1"),
+          config2 = Some("valueFromBaseForConfig2")
+        )
+    }
+  }
+
+  it("overrides the application configuration with the lambda configuration") {
+    withLayeredConfig(
+      baseConfig = """
+          |config1 = "valueFromApplicationForConfig1"
+          |config2 = "valueFromBaseForConfig2"
+          |config3 = "valueFromApplicationForConfig3"
+          |""".asConfig,
+      applicationConfig = """
+          |config1 = "valueFromLambdaForConfig1"
+          |""".asConfig,
+      lambdaConfig = """
+          |config1 = "valueFromLambdaForConfig1"
+          |""".asConfig
+    ) {
+      config =>
+        config shouldBe TestAppConfiguration(
+          config1 = Some("valueFromLambdaForConfig1"),
+          config2 = Some("valueFromBaseForConfig2"),
+          config3 = Some("valueFromApplicationForConfig3")
+        )
+    }
+  }
+
+  it(
+    "resolves values in the application config from the lambda configuration"
+  ) {
+    withLayeredConfig(
+      applicationConfig = s"""
+         |config1 = $${?config2}
+         |""".asConfig,
+      lambdaConfig = """
+          |config1 = "valueFromLambdaForConfig2"
+          |""".asConfig
+    ) {
+      config =>
+        config shouldBe TestAppConfiguration(
+          config1 = Some("valueFromLambdaForConfig2")
+        )
+    }
+  }
+}