diff --git a/src/converters/imagemagick.ts b/src/converters/imagemagick.ts
index 919308b..9f4ff94 100644
--- a/src/converters/imagemagick.ts
+++ b/src/converters/imagemagick.ts
@@ -1,4 +1,5 @@
-import { execFile } from "node:child_process";
+import { execFile as execFileOriginal } from "node:child_process";
+import { ExecFileFn } from "./types.ts";
 
 // declare possible conversions
 export const properties = {
@@ -445,8 +446,8 @@ export function convert(
   fileType: string,
   convertTo: string,
   targetPath: string,
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
   options?: unknown,
+  execFile: ExecFileFn = execFileOriginal,
 ): Promise<string> {
   let outputArgs: string[] = [];
   let inputArgs: string[] = [];
diff --git a/tests/converters/dvisvgm.test.ts b/tests/converters/dvisvgm.test.ts
index 977f065..873b4db 100644
--- a/tests/converters/dvisvgm.test.ts
+++ b/tests/converters/dvisvgm.test.ts
@@ -1,5 +1,5 @@
 import type { ExecFileException } from "node:child_process";
-import { expect, test } from "bun:test";
+import { beforeEach, expect, test } from "bun:test";
 import { convert } from "../../src/converters/dvisvgm.ts";
 import { ExecFileFn } from "../../src/converters/types.ts";
 import {
@@ -8,6 +8,12 @@ import {
   runConvertSuccessTest,
 } from "./helpers/converters.ts";
 
+let calls: string[][] = [];
+
+beforeEach(() => {
+  calls = [];
+});
+
 test("convert resolves when execFile succeeds", async () => {
   await runConvertSuccessTest(convert);
 });
@@ -33,14 +39,16 @@ test("convert respects eps filetype", async () => {
     _args: string[],
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
+    calls.push(_args);
     callback(null, "Fake stdout", "");
   };
 
-  const result = await convert("input.obj", "eps", "stl", "output.stl", undefined, mockExecFile);
+  const result = await convert("input.eps", "eps", "stl", "output.stl", undefined, mockExecFile);
 
   console.log = originalConsoleLog;
 
   expect(result).toBe("Done");
+  expect(calls[0]).toEqual(expect.arrayContaining(["--eps", "input.eps", "output.stl"]));
   expect(loggedMessage).toBe("stdout: Fake stdout");
 });
 
@@ -57,14 +65,16 @@ test("convert respects pdf filetype", async () => {
     _args: string[],
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
+    calls.push(_args);
     callback(null, "Fake stdout", "");
   };
 
-  const result = await convert("input.obj", "pdf", "stl", "output.stl", undefined, mockExecFile);
+  const result = await convert("input.pdf", "pdf", "stl", "output.stl", undefined, mockExecFile);
 
   console.log = originalConsoleLog;
 
   expect(result).toBe("Done");
+  expect(calls[0]).toEqual(expect.arrayContaining(["--pdf", "input.pdf", "output.stl"]));
   expect(loggedMessage).toBe("stdout: Fake stdout");
 });
 
@@ -81,13 +91,15 @@ test("convert respects svgz conversion target type", async () => {
     _args: string[],
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
+    calls.push(_args);
     callback(null, "Fake stdout", "");
   };
 
-  const result = await convert("input.obj", "eps", "svgz", "output.stl", undefined, mockExecFile);
+  const result = await convert("input.obj", "eps", "svgz", "output.svgz", undefined, mockExecFile);
 
   console.log = originalConsoleLog;
 
   expect(result).toBe("Done");
+  expect(calls[0]).toEqual(expect.arrayContaining(["-z", "input.obj", "output.svgz"]));
   expect(loggedMessage).toBe("stdout: Fake stdout");
 });
diff --git a/tests/converters/imagemagick.test.ts b/tests/converters/imagemagick.test.ts
new file mode 100644
index 0000000..26ec4a9
--- /dev/null
+++ b/tests/converters/imagemagick.test.ts
@@ -0,0 +1,179 @@
+import type { ExecFileException } from "node:child_process";
+import { beforeEach, expect, test } from "bun:test";
+import { convert } from "../../src/converters/imagemagick.ts";
+import { ExecFileFn } from "../../src/converters/types.ts";
+import {
+  runConvertFailTest,
+  runConvertLogsStderror,
+  runConvertSuccessTest,
+} from "./helpers/converters.ts";
+
+let calls: string[][] = [];
+
+beforeEach(() => {
+  calls = [];
+});
+
+test("convert resolves when execFile succeeds", async () => {
+  await runConvertSuccessTest(convert);
+});
+
+test("convert rejects when execFile fails", async () => {
+  await runConvertFailTest(convert);
+});
+
+test("convert logs stderr when present", async () => {
+  await runConvertLogsStderror(convert);
+});
+
+test("convert respects ico conversion target type", async () => {
+  const originalConsoleLog = console.log;
+
+  let loggedMessage = "";
+  console.log = (msg) => {
+    loggedMessage = msg;
+  };
+
+  const mockExecFile: ExecFileFn = (
+    _cmd: string,
+    _args: string[],
+    callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
+  ) => {
+    calls.push(_args);
+    callback(null, "Fake stdout", "");
+  };
+
+  const result = await convert("input.obj", "eps", "ico", "output.ico", undefined, mockExecFile);
+
+  console.log = originalConsoleLog;
+
+  expect(result).toBe("Done");
+  expect(calls[0]).toEqual(
+    expect.arrayContaining([
+      "-define",
+      "icon:auto-resize=256,128,64,48,32,16",
+      "-background",
+      "none",
+      "input.obj",
+      "output.ico",
+    ]),
+  );
+  expect(loggedMessage).toBe("stdout: Fake stdout");
+});
+
+test("convert respects ico conversion target type with svg as input filetype", async () => {
+  const originalConsoleLog = console.log;
+
+  let loggedMessage = "";
+  console.log = (msg) => {
+    loggedMessage = msg;
+  };
+
+  const mockExecFile: ExecFileFn = (
+    _cmd: string,
+    _args: string[],
+    callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
+  ) => {
+    calls.push(_args);
+    callback(null, "Fake stdout", "");
+  };
+
+  const result = await convert("input.svg", "svg", "ico", "output.ico", undefined, mockExecFile);
+
+  console.log = originalConsoleLog;
+
+  expect(result).toBe("Done");
+  expect(calls[0]).toEqual(
+    expect.arrayContaining([
+      "-define",
+      "icon:auto-resize=256,128,64,48,32,16",
+      "-background",
+      "none",
+      "-density",
+      "512",
+      "input.svg",
+      "output.ico",
+    ]),
+  );
+  expect(loggedMessage).toBe("stdout: Fake stdout");
+});
+
+test("convert respects ico conversion target type with emf as input filetype", async () => {
+  const originalConsoleLog = console.log;
+
+  let loggedMessage = "";
+  console.log = (msg) => {
+    loggedMessage = msg;
+  };
+
+  const mockExecFile: ExecFileFn = (
+    _cmd: string,
+    _args: string[],
+    callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
+  ) => {
+    calls.push(_args);
+    callback(null, "Fake stdout", "");
+  };
+
+  const result = await convert("input.emf", "emf", "ico", "output.ico", undefined, mockExecFile);
+
+  console.log = originalConsoleLog;
+
+  expect(result).toBe("Done");
+  expect(calls[0]).toEqual(
+    expect.arrayContaining([
+      "-define",
+      "icon:auto-resize=256,128,64,48,32,16",
+      "-background",
+      "none",
+      "emf:delegate=false",
+      "-density",
+      "300",
+      "white",
+      "-alpha",
+      "remove",
+      "input.emf",
+      "output.ico",
+    ]),
+  );
+  expect(loggedMessage).toBe("stdout: Fake stdout");
+});
+
+test("convert respects emf as input filetype", async () => {
+  const originalConsoleLog = console.log;
+
+  let loggedMessage = "";
+  console.log = (msg) => {
+    loggedMessage = msg;
+  };
+
+  const mockExecFile: ExecFileFn = (
+    _cmd: string,
+    _args: string[],
+    callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
+  ) => {
+    calls.push(_args);
+    callback(null, "Fake stdout", "");
+  };
+
+  const result = await convert("input.emf", "emf", "obj", "output.obj", undefined, mockExecFile);
+
+  console.log = originalConsoleLog;
+
+  expect(result).toBe("Done");
+  expect(calls[0]).toEqual(
+    expect.arrayContaining([
+      "-define",
+      "emf:delegate=false",
+      "-density",
+      "300",
+      "-background",
+      "white",
+      "-alpha",
+      "remove",
+      "input.emf",
+      "output.obj",
+    ]),
+  );
+  expect(loggedMessage).toBe("stdout: Fake stdout");
+});