[suppressions] Add end-to-end tests

eng/tools/suppressions/test/e2e/suppressFooJson/suppressions.yaml

@@ -0,0 +1,3 @@
+- tool: TestTool
+  path: foo.json
+  reason: test

eng/tools/suppressions/test/suppressions.e2e.test.ts

@@ -0,0 +1,48 @@
+import { expect, test } from "vitest";
+import { Suppression, getSuppressions } from "../src/suppressions.js";
+import { join } from "path";
+
+async function getTestSuppressions(
+  path: string,
+  tool: string = "TestTool",
+): Promise<Suppression[]> {
+  return await getSuppressions(tool, join(__dirname, "e2e", path));
+}
+
+test.concurrent("no suppressions.yaml", async () => {
+  const suppressions: Suppression[] = await getTestSuppressions("noSuppressionsYaml");
+  expect(suppressions).toEqual([]);
+});
+
+test.concurrent("empty suppressions.yaml", async () => {
+  const suppressions: Suppression[] = await getTestSuppressions("emptySuppressionsYaml");
+  expect(suppressions).toEqual([]);
+});
+
+test.concurrent("suppress foo.json, get foo.json", async () => {
+  const suppressions: Suppression[] = await getTestSuppressions(
+    join("suppressFooJson", "foo.json"),
+  );
+  expect(suppressions).toEqual([
+    {
+      tool: "TestTool",
+      paths: ["foo.json"],
+      reason: "test",
+    },
+  ]);
+});
+
+test.concurrent("suppress foo.json, get bar.json", async () => {
+  const suppressions: Suppression[] = await getTestSuppressions(
+    join("suppressFooJson", "bar.json"),
+  );
+  expect(suppressions).toEqual([]);
+});
+
+test.concurrent("suppress foo.json, get foo.json w/ different tool", async () => {
+  const suppressions: Suppression[] = await getTestSuppressions(
+    join("suppressFooJson", "foo.json"),
+    "TestTool2",
+  );
+  expect(suppressions).toEqual([]);
+});