Add a few tests for invalid values

e2e/only_primitives/missingRequired.pkl

@@ -0,0 +1,3 @@
+amends "schema.pkl"
+
+addr = "localhost"

e2e/only_primitives/outOfBounds.pkl

@@ -0,0 +1,4 @@
+amends "schema.pkl"
+
+addr = "localhost"
+port = 3000000000000

e2e/only_primitives/primitives.test.ts

@@ -4,13 +4,30 @@ import pklGenTypescript from "../../pkl-gen-typescript/main";
 import { join } from "path";
 
 describe("E2E of config with only primitive values", () => {
-  it("can generate the TypeScript sources", async () => {
+  it("can generate TypeScript sources and load valid values", async () => {
     await pklGenTypescript([join(__dirname, "schema.pkl")]);
     const configPkl = await import(join(__dirname, "../../.out/schema.pkl.ts"));
-    const config = await configPkl.loadFromPath(join(__dirname, "values.pkl"));
+    const config = await configPkl.loadFromPath(join(__dirname, "correct.pkl"));
     expect(config).toStrictEqual({
       addr: "localhost",
       port: 3000,
     });
   });
+
+  it.each([
+    ["missing a required property", "missingRequired.pkl"],
+    ["property is of the wrong type", "wrongType.pkl"],
+    ["property fails validation constraint", "outOfBounds.pkl"],
+  ])(
+    "can generate TypeScript sources but error on evaluating invalid values: %s",
+    async (_, fileBase) => {
+      await pklGenTypescript([join(__dirname, "schema.pkl")]);
+      const configPkl = await import(
+        join(__dirname, "../../.out/schema.pkl.ts")
+      );
+      await expect(
+        configPkl.loadFromPath(join(__dirname, `${fileBase}.pkl`))
+      ).rejects.toThrowError();
+    }
+  );
 });

e2e/only_primitives/wrongType.pkl

@@ -0,0 +1,4 @@
+amends "schema.pkl"
+
+addr = "localhost"
+port = "3000"