diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2ff9bd1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# Test output
+tests/output/
+
+# Node modules (Deno node_modules dir)
+node_modules/
diff --git a/deno.json b/deno.json
index b61140f..03abde1 100644
--- a/deno.json
+++ b/deno.json
@@ -1,12 +1,15 @@
 {
+  "nodeModulesDir": "auto",
   "imports": {
-    "@std/cli": "jsr:@std/cli@^1.0.27",
-    "@std/fs": "jsr:@std/fs@^1.0.22",
-    "@std/path": "jsr:@std/path@^1.1.4",
+    "@std/assert": "https://deno.land/std@0.224.0/assert/mod.ts",
+    "@std/cli": "https://deno.land/std@0.224.0/cli/mod.ts",
+    "@std/fs": "https://deno.land/std@0.224.0/fs/mod.ts",
+    "@std/path": "https://deno.land/std@0.224.0/path/mod.ts",
     "sharp": "npm:sharp@^0.34.5"
   },
   "tasks": {
-    "compile": "deno compile --allow-all main.ts"
+    "compile": "deno compile --allow-all main.ts",
+    "test": "deno test -A"
   },
   "version": "0.0.1"
 }
diff --git a/deno.lock b/deno.lock
index 52e04a2..9f15739 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,45 +1,10 @@
 {
   "version": "5",
   "specifiers": {
-    "jsr:@std/cli@*": "1.0.27",
-    "jsr:@std/cli@^1.0.27": "1.0.27",
-    "jsr:@std/fmt@^1.0.9": "1.0.9",
-    "jsr:@std/fs@*": "1.0.22",
-    "jsr:@std/fs@^1.0.22": "1.0.22",
-    "jsr:@std/internal@^1.0.12": "1.0.12",
-    "jsr:@std/path@^1.1.4": "1.1.4",
     "npm:@imagemagick/magick-wasm@0.0.31": "0.0.31",
     "npm:@types/node@*": "24.2.0",
     "npm:sharp@~0.34.5": "0.34.5"
   },
-  "jsr": {
-    "@std/cli@1.0.27": {
-      "integrity": "eba97edd0891871a7410e835dd94b3c260c709cca5983df2689c25a71fbe04de",
-      "dependencies": [
-        "jsr:@std/fmt",
-        "jsr:@std/internal"
-      ]
-    },
-    "@std/fmt@1.0.9": {
-      "integrity": "2487343e8899fb2be5d0e3d35013e54477ada198854e52dd05ed0422eddcabe0"
-    },
-    "@std/fs@1.0.22": {
-      "integrity": "de0f277a58a867147a8a01bc1b181d0dfa80bfddba8c9cf2bacd6747bcec9308",
-      "dependencies": [
-        "jsr:@std/internal",
-        "jsr:@std/path"
-      ]
-    },
-    "@std/internal@1.0.12": {
-      "integrity": "972a634fd5bc34b242024402972cd5143eac68d8dffaca5eaa4dba30ce17b027"
-    },
-    "@std/path@1.1.4": {
-      "integrity": "1d2d43f39efb1b42f0b1882a25486647cb851481862dc7313390b2bb044314b5",
-      "dependencies": [
-        "jsr:@std/internal"
-      ]
-    }
-  },
   "npm": {
     "@emnapi/runtime@1.8.1": {
       "integrity": "sha512-mehfKSMWjjNol8659Z8KxEMrdSJDDot5SXMq00dM8BN4o+CLNXQ0xH2V7EchNHV4RmbZLmmPdEaXZc5H2FXmDg==",
@@ -261,6 +226,133 @@
     }
   },
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+    "https://deno.land/std@0.224.0/path/posix/relative.ts": "3907d6eda41f0ff723d336125a1ad4349112cd4d48f693859980314d5b9da31c",
+    "https://deno.land/std@0.224.0/path/posix/resolve.ts": "08b699cfeee10cb6857ccab38fa4b2ec703b0ea33e8e69964f29d02a2d5257cf",
+    "https://deno.land/std@0.224.0/path/posix/to_file_url.ts": "7aa752ba66a35049e0e4a4be5a0a31ac6b645257d2e031142abb1854de250aaf",
+    "https://deno.land/std@0.224.0/path/posix/to_namespaced_path.ts": "28b216b3c76f892a4dca9734ff1cc0045d135532bfd9c435ae4858bfa5a2ebf0",
+    "https://deno.land/std@0.224.0/path/relative.ts": "ab739d727180ed8727e34ed71d976912461d98e2b76de3d3de834c1066667add",
+    "https://deno.land/std@0.224.0/path/resolve.ts": "a6f977bdb4272e79d8d0ed4333e3d71367cc3926acf15ac271f1d059c8494d8d",
+    "https://deno.land/std@0.224.0/path/to_file_url.ts": "88f049b769bce411e2d2db5bd9e6fd9a185a5fbd6b9f5ad8f52bef517c4ece1b",
+    "https://deno.land/std@0.224.0/path/to_namespaced_path.ts": "b706a4103b104cfadc09600a5f838c2ba94dbcdb642344557122dda444526e40",
+    "https://deno.land/std@0.224.0/path/windows/_util.ts": "d5f47363e5293fced22c984550d5e70e98e266cc3f31769e1710511803d04808",
+    "https://deno.land/std@0.224.0/path/windows/basename.ts": "6bbc57bac9df2cec43288c8c5334919418d784243a00bc10de67d392ab36d660",
+    "https://deno.land/std@0.224.0/path/windows/common.ts": "26f60ccc8b2cac3e1613000c23ac5a7d392715d479e5be413473a37903a2b5d4",
+    "https://deno.land/std@0.224.0/path/windows/constants.ts": "5afaac0a1f67b68b0a380a4ef391bf59feb55856aa8c60dfc01bd3b6abb813f5",
+    "https://deno.land/std@0.224.0/path/windows/dirname.ts": "33e421be5a5558a1346a48e74c330b8e560be7424ed7684ea03c12c21b627bc9",
+    "https://deno.land/std@0.224.0/path/windows/extname.ts": "165a61b00d781257fda1e9606a48c78b06815385e7d703232548dbfc95346bef",
+    "https://deno.land/std@0.224.0/path/windows/format.ts": "bbb5ecf379305b472b1082cd2fdc010e44a0020030414974d6029be9ad52aeb6",
+    "https://deno.land/std@0.224.0/path/windows/from_file_url.ts": "ced2d587b6dff18f963f269d745c4a599cf82b0c4007356bd957cb4cb52efc01",
+    "https://deno.land/std@0.224.0/path/windows/glob_to_regexp.ts": "e45f1f89bf3fc36f94ab7b3b9d0026729829fabc486c77f414caebef3b7304f8",
+    "https://deno.land/std@0.224.0/path/windows/is_absolute.ts": "4a8f6853f8598cf91a835f41abed42112cebab09478b072e4beb00ec81f8ca8a",
+    "https://deno.land/std@0.224.0/path/windows/is_glob.ts": "8a8b08c08bf731acf2c1232218f1f45a11131bc01de81e5f803450a5914434b9",
+    "https://deno.land/std@0.224.0/path/windows/join.ts": "8d03530ab89195185103b7da9dfc6327af13eabdcd44c7c63e42e27808f50ecf",
+    "https://deno.land/std@0.224.0/path/windows/join_globs.ts": "a9475b44645feddceb484ee0498e456f4add112e181cb94042cdc6d47d1cdd25",
+    "https://deno.land/std@0.224.0/path/windows/mod.ts": "2301fc1c54a28b349e20656f68a85f75befa0ee9b6cd75bfac3da5aca9c3f604",
+    "https://deno.land/std@0.224.0/path/windows/normalize.ts": "78126170ab917f0ca355a9af9e65ad6bfa5be14d574c5fb09bb1920f52577780",
+    "https://deno.land/std@0.224.0/path/windows/normalize_glob.ts": "9c87a829b6c0f445d03b3ecadc14492e2864c3ebb966f4cea41e98326e4435c6",
+    "https://deno.land/std@0.224.0/path/windows/parse.ts": "08804327b0484d18ab4d6781742bf374976de662f8642e62a67e93346e759707",
+    "https://deno.land/std@0.224.0/path/windows/relative.ts": "3e1abc7977ee6cc0db2730d1f9cb38be87b0ce4806759d271a70e4997fc638d7",
+    "https://deno.land/std@0.224.0/path/windows/resolve.ts": "8dae1dadfed9d46ff46cc337c9525c0c7d959fb400a6308f34595c45bdca1972",
+    "https://deno.land/std@0.224.0/path/windows/to_file_url.ts": "40e560ee4854fe5a3d4d12976cef2f4e8914125c81b11f1108e127934ced502e",
+    "https://deno.land/std@0.224.0/path/windows/to_namespaced_path.ts": "4ffa4fb6fae321448d5fe810b3ca741d84df4d7897e61ee29be961a6aac89a4c",
     "https://deno.land/x/imagemagick_deno@0.0.14/mod.ts": "6b58c767d2308488597c3660e7ff399ede244198d7903900fa43a49cf93c7796",
     "https://deno.land/x/imagemagick_deno@0.0.14/src/alpha-option.ts": "749a9f3309e491ec09a1d6bc50ce95d9733887d9f57c6863c4ff1c7e9610227b",
     "https://deno.land/x/imagemagick_deno@0.0.14/src/auto-threshold-method.ts": "bb08a00046137e441930e56190b6db10c5fe657cb0a6142cd565a40b1c4250a2",
@@ -317,9 +409,6 @@
   },
   "workspace": {
     "dependencies": [
-      "jsr:@std/cli@^1.0.27",
-      "jsr:@std/fs@^1.0.22",
-      "jsr:@std/path@^1.1.4",
       "npm:sharp@~0.34.5"
     ]
   }
diff --git a/tests/fixtures/test-input.png b/tests/fixtures/test-input.png
new file mode 100644
index 0000000..72a3de8
Binary files /dev/null and b/tests/fixtures/test-input.png differ
diff --git a/tests/generate_tile_test.ts b/tests/generate_tile_test.ts
new file mode 100644
index 0000000..04f0bdc
--- /dev/null
+++ b/tests/generate_tile_test.ts
@@ -0,0 +1,308 @@
+import { assertEquals, assertExists } from "@std/assert";
+import { existsSync } from "@std/fs";
+import { 
+  generateTile, 
+  getImageProperties,
+  calculateTileDimensions,
+  findClosestRationalAngle,
+} from "../src/lib.ts";
+
+// Test fixtures
+const TEST_INPUT = "./tests/fixtures/test-input.png";
+const TEST_OUTPUT_DIR = "./tests/output";
+
+// Ensure output directory exists
+Deno.test("setup - create output directory", async () => {
+  if (!existsSync(TEST_OUTPUT_DIR)) {
+    await Deno.mkdir(TEST_OUTPUT_DIR, { recursive: true });
+  }
+  assertEquals(existsSync(TEST_OUTPUT_DIR), true);
+});
+
+Deno.test("generateTile - generates tile with 0° angle", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(0);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const output = `${TEST_OUTPUT_DIR}/test-0deg.png`;
+
+  await generateTile({
+    input: TEST_INPUT,
+    output,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Verify output file exists
+  assertEquals(existsSync(output), true);
+
+  // Verify output has correct dimensions
+  const outputMetadata = await getImageProperties(output);
+  assertEquals(outputMetadata.width, tileDims.width);
+  assertEquals(outputMetadata.height, tileDims.height);
+  assertEquals(outputMetadata.format, "png");
+});
+
+Deno.test("generateTile - generates tile with 45° angle", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(45);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const output = `${TEST_OUTPUT_DIR}/test-45deg.png`;
+
+  await generateTile({
+    input: TEST_INPUT,
+    output,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Verify output file exists
+  assertEquals(existsSync(output), true);
+
+  // Verify output has correct dimensions
+  const outputMetadata = await getImageProperties(output);
+  assertEquals(outputMetadata.width, tileDims.width);
+  assertEquals(outputMetadata.height, tileDims.height);
+  assertEquals(outputMetadata.format, "png");
+});
+
+Deno.test("generateTile - generates tile with 26.565° angle", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(26.565);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const output = `${TEST_OUTPUT_DIR}/test-26deg.png`;
+
+  await generateTile({
+    input: TEST_INPUT,
+    output,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Verify output file exists
+  assertEquals(existsSync(output), true);
+
+  // Verify output has correct dimensions
+  const outputMetadata = await getImageProperties(output);
+  assertEquals(outputMetadata.width, tileDims.width);
+  assertEquals(outputMetadata.height, tileDims.height);
+  assertEquals(outputMetadata.format, "png");
+});
+
+Deno.test("generateTile - respects quality parameter", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(0);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const outputHigh = `${TEST_OUTPUT_DIR}/test-quality-high.png`;
+  const outputLow = `${TEST_OUTPUT_DIR}/test-quality-low.png`;
+
+  // Generate with high quality
+  await generateTile({
+    input: TEST_INPUT,
+    output: outputHigh,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 100,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Generate with low quality
+  await generateTile({
+    input: TEST_INPUT,
+    output: outputLow,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 10,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Verify both files exist
+  assertEquals(existsSync(outputHigh), true);
+  assertEquals(existsSync(outputLow), true);
+
+  // High quality file should generally be larger than low quality
+  const statsHigh = await Deno.stat(outputHigh);
+  const statsLow = await Deno.stat(outputLow);
+  
+  // Both should be valid PNG files with correct dimensions
+  const metadataHigh = await getImageProperties(outputHigh);
+  const metadataLow = await getImageProperties(outputLow);
+  
+  assertEquals(metadataHigh.width, tileDims.width);
+  assertEquals(metadataHigh.height, tileDims.height);
+  assertEquals(metadataLow.width, tileDims.width);
+  assertEquals(metadataLow.height, tileDims.height);
+});
+
+Deno.test("generateTile - handles different tileMargin values", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(45);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const outputMargin1 = `${TEST_OUTPUT_DIR}/test-margin-1.png`;
+  const outputMargin3 = `${TEST_OUTPUT_DIR}/test-margin-3.png`;
+
+  // Generate with margin 1
+  await generateTile({
+    input: TEST_INPUT,
+    output: outputMargin1,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Generate with margin 3
+  await generateTile({
+    input: TEST_INPUT,
+    output: outputMargin3,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 3,
+    verbose: false,
+  });
+
+  // Verify both files exist and have correct dimensions
+  assertEquals(existsSync(outputMargin1), true);
+  assertEquals(existsSync(outputMargin3), true);
+
+  const metadataMargin1 = await getImageProperties(outputMargin1);
+  const metadataMargin3 = await getImageProperties(outputMargin3);
+
+  assertEquals(metadataMargin1.width, tileDims.width);
+  assertEquals(metadataMargin1.height, tileDims.height);
+  assertEquals(metadataMargin3.width, tileDims.width);
+  assertEquals(metadataMargin3.height, tileDims.height);
+});
+
+Deno.test("generateTile - verbose flag doesn't break execution", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(0);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const output = `${TEST_OUTPUT_DIR}/test-verbose.png`;
+
+  // This should log additional info but not break
+  await generateTile({
+    input: TEST_INPUT,
+    output,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: true,
+  });
+
+  assertEquals(existsSync(output), true);
+  
+  const outputMetadata = await getImageProperties(output);
+  assertEquals(outputMetadata.width, tileDims.width);
+  assertEquals(outputMetadata.height, tileDims.height);
+});
+
+Deno.test("generateTile - creates valid PNG output", async () => {
+  const metadata = await getImageProperties(TEST_INPUT);
+  const rationalAngle = findClosestRationalAngle(45);
+  const tileDims = calculateTileDimensions(
+    metadata.width,
+    metadata.height,
+    rationalAngle,
+  );
+
+  const output = `${TEST_OUTPUT_DIR}/test-valid-png.png`;
+
+  await generateTile({
+    input: TEST_INPUT,
+    output,
+    metadata,
+    tileWidth: tileDims.width,
+    tileHeight: tileDims.height,
+    angle: rationalAngle.degrees,
+    limitInputPixels: false,
+    quality: 90,
+    tileMargin: 1,
+    verbose: false,
+  });
+
+  // Verify it's a valid PNG by reading its properties
+  const outputMetadata = await getImageProperties(output);
+  assertExists(outputMetadata.width);
+  assertExists(outputMetadata.height);
+  assertEquals(outputMetadata.format, "png");
+  
+  // Dimensions should match expected tile dimensions
+  assertEquals(outputMetadata.width, tileDims.width);
+  assertEquals(outputMetadata.height, tileDims.height);
+});
+
+// Cleanup
+Deno.test("cleanup - remove output directory", async () => {
+  if (existsSync(TEST_OUTPUT_DIR)) {
+    await Deno.remove(TEST_OUTPUT_DIR, { recursive: true });
+  }
+  assertEquals(existsSync(TEST_OUTPUT_DIR), false);
+});