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diff --git a/t/t0300-credentials.sh b/t/t0300-credentials.sh
--- /dev/null
+++ b/t/t0300-credentials.sh
@@ -0,0 +1,195 @@
+#!/bin/sh
+
+test_description='basic credential helper tests'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-credential.sh
+
+test_expect_success 'setup helper scripts' '
+ cat >dump <<-\EOF &&
+ whoami=`echo $0 | sed s/.*git-credential-//`
+ echo >&2 "$whoami: $*"
+ while IFS== read key value; do
+ echo >&2 "$whoami: $key=$value"
+ eval "$key=$value"
+ done
+ EOF
+
+ cat >git-credential-useless <<-\EOF &&
+ #!/bin/sh
+ . ./dump
+ exit 0
+ EOF
+ chmod +x git-credential-useless &&
+
+ cat >git-credential-verbatim <<-\EOF &&
+ #!/bin/sh
+ user=$1; shift
+ pass=$1; shift
+ . ./dump
+ test -z "$user" || echo username=$user
+ test -z "$pass" || echo password=$pass
+ EOF
+ chmod +x git-credential-verbatim &&
+
+ PATH="$PWD:$PATH"
+'
+
+test_expect_success 'credential_fill invokes helper' '
+ check fill "verbatim foo bar" <<-\EOF
+ --
+ username=foo
+ password=bar
+ --
+ verbatim: get
+ EOF
+'
+
+test_expect_success 'credential_fill invokes multiple helpers' '
+ check fill useless "verbatim foo bar" <<-\EOF
+ --
+ username=foo
+ password=bar
+ --
+ useless: get
+ verbatim: get
+ EOF
+'
+
+test_expect_success 'credential_fill stops when we get a full response' '
+ check fill "verbatim one two" "verbatim three four" <<-\EOF
+ --
+ username=one
+ password=two
+ --
+ verbatim: get
+ EOF
+'
+
+test_expect_success 'credential_fill continues through partial response' '
+ check fill "verbatim one \"\"" "verbatim two three" <<-\EOF
+ --
+ username=two
+ password=three
+ --
+ verbatim: get
+ verbatim: get
+ verbatim: username=one
+ EOF
+'
+
+test_expect_success 'credential_fill passes along metadata' '
+ check fill "verbatim one two" <<-\EOF
+ protocol=ftp
+ host=example.com
+ path=foo.git
+ --
+ username=one
+ password=two
+ --
+ verbatim: get
+ verbatim: protocol=ftp
+ verbatim: host=example.com
+ verbatim: path=foo.git
+ EOF
+'
+
+test_expect_success 'credential_approve calls all helpers' '
+ check approve useless "verbatim one two" <<-\EOF
+ username=foo
+ password=bar
+ --
+ --
+ useless: store
+ useless: username=foo
+ useless: password=bar
+ verbatim: store
+ verbatim: username=foo
+ verbatim: password=bar
+ EOF
+'
+
+test_expect_success 'do not bother storing password-less credential' '
+ check approve useless <<-\EOF
+ username=foo
+ --
+ --
+ EOF
+'
+
+
+test_expect_success 'credential_reject calls all helpers' '
+ check reject useless "verbatim one two" <<-\EOF
+ username=foo
+ password=bar
+ --
+ --
+ useless: erase
+ useless: username=foo
+ useless: password=bar
+ verbatim: erase
+ verbatim: username=foo
+ verbatim: password=bar
+ EOF
+'
+
+test_expect_success 'usernames can be preserved' '
+ check fill "verbatim \"\" three" <<-\EOF
+ username=one
+ --
+ username=one
+ password=three
+ --
+ verbatim: get
+ verbatim: username=one
+ EOF
+'
+
+test_expect_success 'usernames can be overridden' '
+ check fill "verbatim two three" <<-\EOF
+ username=one
+ --
+ username=two
+ password=three
+ --
+ verbatim: get
+ verbatim: username=one
+ EOF
+'
+
+test_expect_success 'do not bother completing already-full credential' '
+ check fill "verbatim three four" <<-\EOF
+ username=one
+ password=two
+ --
+ username=one
+ password=two
+ --
+ EOF
+'
+
+# We can't test the basic terminal password prompt here because
+# getpass() tries too hard to find the real terminal. But if our
+# askpass helper is run, we know the internal getpass is working.
+test_expect_success 'empty helper list falls back to internal getpass' '
+ check fill <<-\EOF
+ --
+ username=askpass-username
+ password=askpass-password
+ --
+ askpass: Username:
+ askpass: Password:
+ EOF
+'
+
+test_expect_success 'internal getpass does not ask for known username' '
+ check fill <<-\EOF
+ username=foo
+ --
+ username=foo
+ password=askpass-password
+ --
+ askpass: Password:
+ EOF
+'
+
+test_done