test: dedupe repeated validation and throw assertions

src/config/includes.test.ts

@@ -142,8 +142,8 @@ describe("resolveConfigIncludes", () => {
     for (const testCase of cases) {
       const files = { [configPath(testCase.includeFile)]: testCase.included };
       const obj = { $include: `./${testCase.includeFile}`, extra: true };
-      expect(() => resolve(obj, files), testCase.includeFile).toThrow(ConfigIncludeError);
-      expect(() => resolve(obj, files), testCase.includeFile).toThrow(
+      expectResolveIncludeError(
+        () => resolve(obj, files),
         /Sibling keys require included content to be an object/,
       );
     }

src/config/sessions/sessions.test.ts

@@ -21,10 +21,10 @@ import type { SessionEntry } from "./types.js";
 
 describe("session path safety", () => {
   it("rejects unsafe session IDs", () => {
-    expect(() => validateSessionId("../etc/passwd")).toThrow(/Invalid session ID/);
-    expect(() => validateSessionId("a/b")).toThrow(/Invalid session ID/);
-    expect(() => validateSessionId("a\\b")).toThrow(/Invalid session ID/);
-    expect(() => validateSessionId("/abs")).toThrow(/Invalid session ID/);
+    const unsafeSessionIds = ["../etc/passwd", "a/b", "a\\b", "/abs"];
+    for (const sessionId of unsafeSessionIds) {
+      expect(() => validateSessionId(sessionId), sessionId).toThrow(/Invalid session ID/);
+    }
   });
 
   it("resolves transcript path inside an explicit sessions dir", () => {

src/gateway/call.test.ts

@@ -333,9 +333,16 @@ describe("buildGatewayConnectionDetails", () => {
     resolveGatewayPort.mockReturnValue(18789);
     pickPrimaryTailnetIPv4.mockReturnValue(undefined);
 
-    expect(() => buildGatewayConnectionDetails()).toThrow("SECURITY ERROR");
-    expect(() => buildGatewayConnectionDetails()).toThrow("plaintext ws://");
-    expect(() => buildGatewayConnectionDetails()).toThrow("wss://");
+    let thrown: unknown;
+    try {
+      buildGatewayConnectionDetails();
+    } catch (error) {
+      thrown = error;
+    }
+    expect(thrown).toBeInstanceOf(Error);
+    expect((thrown as Error).message).toContain("SECURITY ERROR");
+    expect((thrown as Error).message).toContain("plaintext ws://");
+    expect((thrown as Error).message).toContain("wss://");
   });
 
   it("allows ws:// for loopback addresses in local mode", () => {

src/slack/blocks-input.test.ts

@@ -19,23 +19,39 @@ describe("parseSlackBlocksInput", () => {
     expect(parsed).toEqual([{ type: "section", text: { type: "mrkdwn", text: "hi" } }]);
   });
 
-  it("rejects invalid JSON", () => {
-    expect(() => parseSlackBlocksInput("{bad-json")).toThrow(/valid JSON/i);
-  });
+  it("rejects invalid block payloads", () => {
+    const cases = [
+      {
+        name: "invalid JSON",
+        input: "{bad-json",
+        expectedMessage: /valid JSON/i,
+      },
+      {
+        name: "non-array payload",
+        input: { type: "divider" },
+        expectedMessage: /must be an array/i,
+      },
+      {
+        name: "empty array",
+        input: [],
+        expectedMessage: /at least one block/i,
+      },
+      {
+        name: "non-object block",
+        input: ["not-a-block"],
+        expectedMessage: /must be an object/i,
+      },
+      {
+        name: "missing block type",
+        input: [{}],
+        expectedMessage: /non-empty string type/i,
+      },
+    ] as const;
 
-  it("rejects non-array payloads", () => {
-    expect(() => parseSlackBlocksInput({ type: "divider" })).toThrow(/must be an array/i);
-  });
-
-  it("rejects empty arrays", () => {
-    expect(() => parseSlackBlocksInput([])).toThrow(/at least one block/i);
-  });
-
-  it("rejects non-object blocks", () => {
-    expect(() => parseSlackBlocksInput(["not-a-block"])).toThrow(/must be an object/i);
-  });
-
-  it("rejects blocks without type", () => {
-    expect(() => parseSlackBlocksInput([{}])).toThrow(/non-empty string type/i);
+    for (const testCase of cases) {
+      expect(() => parseSlackBlocksInput(testCase.input), testCase.name).toThrow(
+        testCase.expectedMessage,
+      );
+    }
   });
 });