ci(test): use cargo nextest to speed up the test

.config/nextest.toml

@@ -0,0 +1,3 @@
+[profile.default]
+slow-timeout = { period = "60s", terminate-after = 2 }
+fail-fast = false

.github/workflows/ci.yml

@@ -2,6 +2,9 @@ name: CI
 
 on: [push, pull_request]
 
+env:
+  CARGO_TERM_COLOR: always
+
 jobs:
     build:
         name: Cargo build
@@ -16,9 +19,32 @@ jobs:
               with:
                   command: build
                   args: --release --all-features
+
     test:
         name: Cargo test
         runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - uses: actions-rs/toolchain@v1
+              with:
+                  toolchain: nightly
+                  override: true
+            - uses: taiki-e/install-action@nextest
+            - uses: actions-rs/cargo@v1
+              with:
+                  command: build
+            - name: Run cargo nextest
+              run: |
+                # Run all tests except '*bitmex*' binaries, as
+                # bitmex limited the request rate.
+                cargo nextest run -E 'all() - binary(~bitmex)'
+
+                # Run the '*bitmex*' tests in -j1.
+                cargo nextest run -E 'binary(~bitmex)' -j1
+
+    doc-test:
+        name: Cargo doctest
+        runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v2
             - uses: actions-rs/toolchain@v1
@@ -28,6 +54,8 @@ jobs:
             - uses: actions-rs/cargo@v1
               with:
                   command: test
+                  args: --doc
+
     fmt:
         name: Cargo fmt
         runs-on: ubuntu-latest