Used bats/expect to perform a better test

integration-tests/bats/pager.bats

@@ -0,0 +1,36 @@
+#!/usr/bin/env bats
+load $BATS_TEST_DIRNAME/helper/common.bash
+
+setup() {
+  setup_common
+
+  for i in {1..20}; do
+    dolt commit --allow-empty -m "commit $i abc"
+  done
+}
+
+teardown() {
+  teardown_common
+}
+
+export NO_COLOR=1
+
+@test "dolt log with pager" {
+  # We use `expect` because we need TTY simulation to get the pager to kick in
+  export DOLT_PAGER="tail -n 2"
+  run expect $BATS_TEST_DIRNAME/pager.expect
+  [ "$status" -eq 0 ]
+  [[ ! "$output" =~ "commit 2 abc" ]] || false
+  [[ "$output" =~ "commit 1 abc" ]] || false
+  [[ "$output" =~ "Initialize data repository" ]] || false
+  [ "${#lines[@]}" -eq 2 ]
+
+  export DOLT_PAGER="head -n 3"
+  run expect $BATS_TEST_DIRNAME/pager.expect
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ "commit 20 abc" ]] || false
+  [[ "$output" =~ "commit 19 abc" ]] || false
+  [[ "$output" =~ "commit 18 abc" ]] || false
+  [[ ! "$output" =~ "commit 17 abc" ]] || false
+  [ "${#lines[@]}" -eq 3 ]
+}

integration-tests/bats/pager.expect

@@ -0,0 +1,4 @@
+#!/usr/bin/expect
+
+spawn -noecho dolt log --oneline
+expect eof