diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e476299bd..38eba2ee1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,11 +11,11 @@ env:
 
 jobs:
   build:
+    name: ${{ matrix.os }}
     strategy:
       matrix:
         os: [macos-latest, windows-latest]
       fail-fast: false
-    name: ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 5e44f66bd..3cf8bccb9 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,32 +1,35 @@
-name: Lint
-
-on:
-  push:
-    branches: ['main']
-  pull_request:
-
-env:
-  REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      # refer: https://v2.tauri.app/start/prerequisites/#linux
-      - run: |
-          sudo apt update
-          sudo apt install libwebkit2gtk-4.1-dev \
-            build-essential \
-            curl \
-            wget \
-            file \
-            libxdo-dev \
-            libssl-dev \
-            libayatana-appindicator3-dev \
-            librsvg2-dev
-      - uses: actions/checkout@v6
-      - uses: Swatinem/rust-cache@v2
-      - uses: reviewdog/action-setup@v1
-      - run: cargo check -q --message-format=short | reviewdog -f cargo-check -reporter=github-check
-      - run: cargo clippy -q --message-format=short | reviewdog -f clippy -reporter=github-check
-      - uses: bnjbvr/cargo-machete@main
+name: Lint
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  lint:
+    name: Lint
+    env:
+      REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    runs-on: ubuntu-latest
+    steps:
+      # refer: https://v2.tauri.app/start/prerequisites/#linux
+      - run: |
+          sudo apt update
+          sudo apt install libwebkit2gtk-4.1-dev \
+            build-essential \
+            curl \
+            wget \
+            file \
+            libxdo-dev \
+            libssl-dev \
+            libayatana-appindicator3-dev \
+            librsvg2-dev
+      - uses: actions/checkout@v6
+      - uses: Swatinem/rust-cache@v2
+      - uses: reviewdog/action-setup@v1
+      - run: cargo check -q --message-format=short | reviewdog -f cargo-check -reporter=github-check
+      - run: cargo clippy -q --message-format=short | reviewdog -f clippy -reporter=github-check
+      - uses: bnjbvr/cargo-machete@main
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 000000000..000a55fb9
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,32 @@
+name: Test
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Integration tests
+    runs-on: ubuntu-latest
+    steps:
+      # refer: https://v2.tauri.app/start/prerequisites/#linux
+      - run: |
+          sudo apt update
+          sudo apt install libwebkit2gtk-4.1-dev \
+            build-essential \
+            curl \
+            wget \
+            file \
+            libxdo-dev \
+            libssl-dev \
+            libayatana-appindicator3-dev \
+            librsvg2-dev \
+            fonts-noto-cjk
+      - uses: actions/checkout@v6
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --no-run
+      - run: cargo test --workspace --tests
diff --git a/koharu-ml/src/lama/fft/cpu.rs b/koharu-ml/src/lama/fft/cpu.rs
index 170d9629a..7388f2ea8 100644
--- a/koharu-ml/src/lama/fft/cpu.rs
+++ b/koharu-ml/src/lama/fft/cpu.rs
@@ -104,16 +104,21 @@ pub fn irfft2(storage: &CpuStorage, layout: &Layout, width: usize) -> Result<(Cp
                 let base = x * 2;
                 *c = Complex32::new(row[base], row[base + 1]);
             }
-            for x in 1..w_half {
-                let mirror = width - x;
-                dst_row[mirror] = dst_row[x].conj();
-            }
         }
-
-        for row in buffer.chunks_exact_mut(width) {
-            ifft_w.process(row);
+        // Reconstruct the full complex spectrum using the conjugate symmetry
+        // property of real-valued signals: F(-ky, -kx) = conj(F(ky, kx)).
+        for ky in 0..height {
+            let mirror_ky = if ky == 0 { 0 } else { height - ky };
+            let row_start = ky * width;
+            let mirror_row_start = mirror_ky * width;
+            for kx in 1..w_half {
+                let mirror_kx = width - kx;
+                buffer[row_start + mirror_kx] = buffer[mirror_row_start + kx].conj();
+            }
         }
 
+        // Apply the inverse transform in the reverse order of the forward pass:
+        // first undo the height transform, then undo the width transform.
         for x in 0..width {
             for (dst, src) in col_buffer
                 .iter_mut()
@@ -132,6 +137,10 @@ pub fn irfft2(storage: &CpuStorage, layout: &Layout, width: usize) -> Result<(Cp
             }
         }
 
+        for row in buffer.chunks_exact_mut(width) {
+            ifft_w.process(row);
+        }
+
         let out_plane = &mut dst[bc * plane_out_stride..(bc + 1) * plane_out_stride];
         for (out, val) in out_plane.iter_mut().zip(buffer.iter()) {
             *out = val.re;
diff --git a/koharu-ml/tests/comic_text_detector.rs b/koharu-ml/tests/comic_text_detector.rs
index 07336fe0c..22088c556 100644
--- a/koharu-ml/tests/comic_text_detector.rs
+++ b/koharu-ml/tests/comic_text_detector.rs
@@ -1,11 +1,10 @@
 use std::path::Path;
 
-use koharu_ml::{comic_text_detector::ComicTextDetector, device};
+use koharu_ml::comic_text_detector::ComicTextDetector;
 
 #[tokio::test]
 async fn comic_text_detector() -> anyhow::Result<()> {
-    let device = device(true)?;
-    let model = ComicTextDetector::load(device).await?;
+    let model = ComicTextDetector::load(false).await?;
 
     let img = image::open(Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/1.jpg"))?;
     let (boxes, mask) = model.inference(&img)?;
diff --git a/koharu-ml/tests/fixtures/dialog.jpg b/koharu-ml/tests/fixtures/dialog.jpg
new file mode 100644
index 000000000..a6cd00253
Binary files /dev/null and b/koharu-ml/tests/fixtures/dialog.jpg differ
diff --git a/koharu-ml/tests/fixtures/image.jpg b/koharu-ml/tests/fixtures/image.jpg
new file mode 100644
index 000000000..79159e949
Binary files /dev/null and b/koharu-ml/tests/fixtures/image.jpg differ
diff --git a/koharu-ml/tests/fixtures/mask.png b/koharu-ml/tests/fixtures/mask.png
new file mode 100644
index 000000000..4acce5e61
Binary files /dev/null and b/koharu-ml/tests/fixtures/mask.png differ
diff --git a/koharu-ml/tests/inpaint.rs b/koharu-ml/tests/inpaint.rs
new file mode 100644
index 000000000..5186a1206
--- /dev/null
+++ b/koharu-ml/tests/inpaint.rs
@@ -0,0 +1,36 @@
+use std::path::Path;
+
+use koharu_ml::lama::Lama;
+use image::GenericImageView;
+
+#[tokio::test]
+async fn lama_inpainting_updates_masked_region() -> anyhow::Result<()> {
+    let fixtures = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures");
+
+    let lama = Lama::load(false).await?;
+    let base = image::open(fixtures.join("image.jpg"))?;
+    let mask = image::open(fixtures.join("mask.png"))?;
+
+    let output = lama.inference(&base, &mask)?;
+
+    assert_eq!(output.dimensions(), base.dimensions());
+
+    let mask = mask.to_luma8();
+    let base = base.to_rgb8();
+    let output = output.to_rgb8();
+
+    let mut changed = false;
+    for ((mask_px, base_px), out_px) in mask
+        .pixels()
+        .zip(base.pixels())
+        .zip(output.pixels())
+    {
+        if mask_px.0[0] > 0 && base_px.0 != out_px.0 {
+            changed = true;
+            break;
+        }
+    }
+
+    assert!(changed, "inpainting should change at least one masked pixel");
+    Ok(())
+}
diff --git a/koharu-ml/tests/llm.rs b/koharu-ml/tests/llm.rs
new file mode 100644
index 000000000..b85f27e97
--- /dev/null
+++ b/koharu-ml/tests/llm.rs
@@ -0,0 +1,29 @@
+use koharu_ml::llm::{GenerateOptions, Llm, ModelId};
+use strum::IntoEnumIterator;
+
+#[tokio::test]
+async fn llm_generates_text_for_all_models() -> anyhow::Result<()> {
+    let prompt = "こんにちは、テストです。";
+
+    for model in ModelId::iter() {
+        let mut llm = Llm::load(model, false).await?;
+        let opts = GenerateOptions {
+            max_tokens: 32,
+            temperature: 0.0,
+            top_k: None,
+            top_p: None,
+            seed: 1,
+            split_prompt: false,
+            repeat_penalty: 1.0,
+            repeat_last_n: 64,
+        };
+
+        let generated = llm.generate(prompt, &opts)?;
+        assert!(
+            !generated.trim().is_empty(),
+            "model {model:?} should return some text"
+        );
+    }
+
+    Ok(())
+}
diff --git a/koharu-ml/tests/ocr.rs b/koharu-ml/tests/ocr.rs
new file mode 100644
index 000000000..c4f39ebb3
--- /dev/null
+++ b/koharu-ml/tests/ocr.rs
@@ -0,0 +1,20 @@
+use std::path::Path;
+
+use koharu_ml::manga_ocr::MangaOcr;
+
+#[tokio::test]
+async fn manga_ocr_reads_dialog_image() -> anyhow::Result<()> {
+    let fixtures = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures");
+    let image = image::open(fixtures.join("dialog.jpg"))?;
+
+    let ocr = MangaOcr::load(false).await?;
+    let results = ocr.inference(&[image])?;
+
+    assert_eq!(results.len(), 1);
+    assert!(
+        !results[0].trim().is_empty(),
+        "OCR result should contain text"
+    );
+
+    Ok(())
+}